JPS61279647A - Aluminum alloy reinforced with silicon carbide short fiber - Google Patents

Abstract

PURPOSE:To improve mechanical characteristic such as bending strength and impulsion resistance, by using a silicon carbide short fiber having a specified vol. ratio as reinforcing fiber, to Al-Cu-Mg alloy matrix having a specified compsn. CONSTITUTION:The silicon carbide short fibers 1 are compacted to orient them randomly in three dimensions, and to form a fiber compact 2 having 5-50% vol. ratio. The compact 2 is heated and arranged in a mold cavity 4 of a mold 3. A molten Al alloy 5 contg. 2-6% Cu, 0-2% Mg is poured in the mold 3, and solidified under the state being pressed by a plunger 6. Next, Al alloy part at outer circumference of solidified body is machined and removed. By composite material composed of the titled alloy, used quantity of reinforcing fiber can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to fiber-reinforced metal composite materials, and furthermore,
□Specifically, it relates to a composite material in which short silicon carbide fibers are reinforced mH and an aluminum alloy is used as a matrix metal, that is, a silicon carbide mH reinforced aluminum alloy.

Problems to be solved by conventional techniques and inventions! As the aluminum alloy constituting the matrix metal of the I-miscellaneous reinforced metal composite material, the following #8n aluminum alloy or wrought aluminum alloy has conventionally been used.

Aluminum alloy for casting JISJN grade AC8A (0.8~1.3%Cu111
, O~13.0%5r1o, 7~1.3%Ma, 0.
8-1.5%Nl, remainder substantially AI) JISAR rating A
C8B (2.0-4.0% Cu.

8.5-10.5% st z 0.5-1.5% MO1
0.1-1% N+, remainder substantially AI) J l5M14
A04G (0.25%≧cu, 6°5~7.5%S
i, 0.25-0.45% Mg, remainder substantially AI) AAI rating A201 (4-5% Cu, 0.2-0°4% M
n, 0.15-0.35% MO10,15-0.35
%T1, the remainder is substantially AI>AA standard A356 (6,
5~7.5%SI%O-"25~0.45%Mo
, 0.2≧Fe, 0.2%≧Cu, remainder substantially A
I> Al-2~3% S1 alloy (DuPont) Aluminum alloy for wrought JIS standard 6061 (0.4~0.8% S1.0.1
5-0.4% Cu, 0.8-1.2% Mg, 0.04
~0.35% Cr, remainder substantially AI) JIS standard 50
56 (0.3%≧3i, 0.4%≧Fe, 0.1%
≧Cu, 0.05-0.2%Mn, 4.5-5.6
%Mg, 0.05-0.2%Cr 10.1%≧Zn,
Remainder actual GCAI > JIS standard 2024 <0.5
%Si, 0.5%Fe, 3.8-4.9%Cu,
0.3-0.9% Mn, 1.2-1.8% Mg, 0.
1%≧Cr.

0.25%≧Zn, 0.15%≧TI, remainder substantially A
I) JIS standard 7075 (0.4%≧3i, 0.5%
≧F8.1.2-2.0% Cu 10.3≧Mn.

2.1-2.9% Mg, 0.18-0.28% Cr, 5
．． 1-6.1%Zn10.2%Tis balance substantially AI
) Conventional research on composite materials using these aluminum alloys as matrix metals has been conducted with the aim of improving the strength etc. of these conventional aluminum alloys. Aluminum alloys do not necessarily have the optimal composition in relation to reinforcing fibers, and therefore, depending on the conventionally used aluminum alloys mentioned above, it is difficult to make composite materials using aluminum alloys as the matrix metal. physical properties, especially strength and impact resistance, cannot be optimized.

In view of the above-mentioned problems with conventionally commonly used composite materials using aluminum alloy as a matrix metal, the inventors of the present application have developed a conventional fiber-reinforced metal composite material. Among the various reinforcing fibers used in Ill construction, a composite material whose reinforcing fiber is silicon carbide 11N, which has particularly high strength and is excellent in high temperature stability and strength improvement effect.
As a result of various experimental studies on what composition the aluminum alloy as the matrix metal has is suitable for R, it was found that the Cu and MQ contents are within specific ranges, and 3i, Ni, 7n, etc. It has been found that an aluminum alloy containing substantially no elements is optimal as a matrix metal.

The present invention is based on the knowledge obtained as a result of various experimental studies conducted by the inventors of the present invention, and is a composite material in which short silicon carbide fibers are used as reinforcing fibers, aluminum alloy is used as a matrix metal, and the material has excellent bending strength. We provide composite materials with excellent mechanical properties such as impact resistance.
It is intended to.

Means for Solving the Problems As mentioned above Objective 1・Invention 1-1・Charcoal (t, '1'''
″IIHiffral/li@m(II411a&Iy
, Cu *1jffi$2~6% i, and the MQ containing station is 0~2% and the remainder is substantially 1
The aluminum alloy which is A'l is the matrix metal'! ″6・The above-mentioned charcoal ``7″ rope short fiber [(7) Volume ratio/″
5-5: □0% carbonized siliceous fiber-reinforced aluminum composite).

It is achieved through money.
I Functions and Effects of the Invention According to the present invention, the reinforcing fiber has high strength.
・Silicon carbide with excellent high temperature stability and strength improvement effect
Aluminum alloy in which 10% fiber is used, Cu content is 2 to 6% as matrix metal, Mg content is 0 to 2% and the balance is substantially Al.
4; is used and the volume fraction of silicon carbide syrim fibers is set to 5 to 5'0%, as is clear from the experimental research conducted by the inventors of the present invention, which will be explained later, the strength is increased. , a composite material with excellent mechanical properties such as impact resistance can be obtained.

Further, according to the present invention, if it is sufficient to obtain a strength equivalent to that of conventional silicon carbide short fiber reinforced aluminum alloys, the volume fraction of silicon carbide 8H may be a lower value than conventional ones. Therefore, the amount of silicon carbide short fibers used can be reduced, so the machinability and productivity of the composite material can be improved, and the cost of the composite material can be reduced.

When CU is added to Al as the matrix metal of a composite material, the strength of the Al improves, which improves the strength of the composite material, but if the Cu content is less than 2%, this effect is not sufficient. When the Cu content exceeds 6%, the composite material becomes extremely brittle and tends to fail prematurely. Therefore, the Cu content of the aluminum alloy as the matrix metal in the composite material of the present invention is 2 to 6%, preferably 2 to 5.5%.

In addition, oxides are usually present on the surface of carbide silica M & miscellaneous as reinforcement III, and if Mg, which has a strong tendency to form oxides, is contained in the molten matrix metal, MO
reacts with oxides on the silicon carbide surface to reduce the surface of the silicon carbide short fibers, improving the adhesion between the molten matrix metal and the silicon carbide fibers, and reducing the Mg content up to about 3%. In this range, the strength of the composite material increases as the MO content increases. However, when the Mg content exceeds 2%, the impact resistance of the composite material decreases rapidly.

Therefore, the Mg content of the aluminum alloy as the matrix metal in the present invention is 0 to 2%, preferably 0.2%.
~1%.

Especially from the point of view of W* resistance such as Charpy impact value,
When the Cu content of the aluminum alloy as the matrix metal is relatively low, such as 2 to 3%, the impact value is virtually constant in the Mg content range of 0 to 2%,
When the Ma content exceeds 2%, the impact value decreases rapidly.

Furthermore, when the Cu content of the aluminum alloy is relatively high, such as 4 to 6%, the impact value is substantially constant in the Mg content range of 0 to 1%; When the content is in the range of 1 to 2%, it decreases slightly as the Mg content increases, and when the Mg content exceeds 2%, it decreases rapidly. This is because the impact value generally decreases as the Mg content increases, but because MO in the aluminum alloy is trapped around the silicon carbide short fibers due to the reaction between Mo and the silicon carbide fibers that are reinforced IN, Ma It is presumed that a relatively high impact value can be obtained within a content range of up to about 2%. Therefore, according to one detailed feature of the invention, the Cu content and Mg content are 2-3% and 0-3%, respectively, in order to obtain a composite material that is excellent in both strength, such as flexural strength, and impact resistance. It is said to be 2%.

Furthermore, in a composite material whose matrix metal is an aluminum alloy having the above-mentioned composition, sufficient strength cannot be ensured if the volume fraction of silicon carbide short fibers is less than 5%. Volume fraction of silicon carbide 8H is 40%
In particular, when it exceeds 50%, even if the volume fraction of the silicon carbide short fibers is increased, the strength of the composite material does not increase significantly, and furthermore, as the silicon carbide short fibers increase, the impact resistance of the composite material decreases. In addition, the wear resistance of the composite material improves as the volume fraction of the cut silicon carbide fibers increases, but it rapidly increases as the fiber volume fraction increases in the range of the volume fraction of silicon carbide short fibers from 0 to 5%. However, in a region where the fiber volume fraction is about 5% or more, the abrasion resistance of the composite material does not improve much even if the aha volume fraction is increased. Therefore, according to one feature of the invention, the volume fraction of silicon carbide staple fibers is between 5 and 50%, preferably between 5 and 40%.

In addition, the Cu content of the aluminum alloy as the matrix metal of the composite material of the present invention has a relatively high 1: value, and the Cu content in the aluminum alloy is uneven.
If there is 1, the part with high Cu81 degree becomes weak, 5, 8, 1□ke, □1. Tsuyu□□6yu85 □I can't. Therefore, according to yet another detailed feature of the present invention, an aluminum alloy having a Cu content of 2% or more and less than 3.5% is prepared so that the Cu11 degree in the aluminum alloy is uniform. The composite material used as the matrix metal is subjected to solution treatment at 480 to 520°C for 2 to 8 hours, preferably further subjected to aging treatment at 150 to 200°C for 2 to 8 hours, and CIJ A composite material whose matrix metal is an aluminum alloy with a content of 3.5 to 6% is 460
Solution treatment was performed at ~510°C for 2 to 8 hours,
Preferably, an aging treatment is further performed at 150 to 200°C for 2 to 8 hours.

Furthermore, the silicon carbide short fibers used in the composite material of the present invention are
It may be either silicon carbide voice force or silicon carbide discontinuous IJAH, and the silicon carbide discontinuous fibers may be silicon carbide continuous fibers cut to a predetermined length. In addition, the fiber length of silicon carbide IIM is 10 μ to 5
cg+, particularly preferably about 50μ to 2CI, and the fiber diameter is preferably about 0.1 to 25μ, especially about 0.1 to 20μ.

All percentages in this specification are by weight, except when expressing the volume fraction of fibers, and "substantially Al" in the expression of the composition of an aluminum alloy refers to the presence of Al in the aluminum alloy as a matrix metal. Included AI, CU
81 other than 1MCI, F13. Zn, Mn, Ni, Ti
%0r(7) means that the total amount of inevitable metal elements is 1% or less. Further, in the present specification, when a range is indicated by [above], "below", or "~" regarding a composition or temperature, it is assumed that the value itself is included in the range.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be explained in detail below by way of example embodiments with reference to the accompanying figures.

Example 1 In order to improve the strength of a composite material in which silicon carbide short fibers are used as reinforcing fibers and aluminum alloy is used as a matrix metal, the composition of the aluminum alloy was investigated. Silicon carbide voice power (“Tokamax” manufactured by Tokai Carbon Co., Ltd.)
Composite materials are manufactured by high-pressure casting method, with reinforced IJAN (IJAN having a rough length of 50 to 200μ and fiber diameter of 0.2 to 0.5μ) and matrix metals of aluminum alloys of various compositions based on AI-C1I-MO, The bending strength of each composite material was evaluated.

First, by blending pure aluminum base metal (99% or higher purity), pure magnesium (99% or higher purity), and AI-50% cum alloy, various Cu An aluminum alloy Al~A34 having a Mg content and the balance being substantially Al was formed.

Next, by compression molding the silicon carbide voice aggregate without using a binder, the individual silicon carbide voices 1 are oriented substantially three-dimensionally at random, as shown in FIG. 38 whose volume ratio is 30%
A l1lff molded body 2 of x100 x 16Ill was formed. Next, the m-fiber molded body 2 is heated to 600°C, and then molded into the mold 3 of the mold 3 at 250°C as shown in FIG. The molten aluminum alloy 5 at 710°C is quickly poured into the mold, and the melt field is heated to about 20°C.
Pressure was applied using a plunger 6 at 0° C. at a pressure of 1000 k<1/cj, and the pressurized state was maintained until the layer temperature of the aluminum alloy completely solidified. After the molten metal in the mold 3 has completely solidified, the solidified body is taken out from the mold, and the portion consisting only of aluminum alloy existing on the outer periphery of the solidified body is removed by cutting, thereby reinforcing the silicon carbide voice force. Then, a composite material having an aluminum alloy as a matrix metal and a fiber volume fraction of 30% was taken out.

;□ □ Naruto Table 1 Alloy No., Cu content (%) Ma km work%
>Al1.51 0.03 A2 2.04 0.04 A3 3.03 0.03 A4 4.53 0.04 A5 5.54 0.04A6
6.49 0.04A7
1.50 0.23A8 2.0
3 0.24A9 3.03
0.2OAIO4,530,23 Al1 5.53 0.18AI2
6.48 0.20Al3 1
,05 1.02Al4 2.04
1.02Al5 2.97
1.04Al6 4.04 1.02
Al7 5.03 1.0OAl8
5.52 1.02 Table 1 (continued) Alloy No., Cu content (%) Ma content (%) A
l9 5.95 0.95A20 6
．． 49 1.01A21 1,48
2.00A22 2.03 1.98
A23 2.95 2.02A24
4.02 1.96A25 4.96
2.04A26 5.51 2.0
1A27 5.97 2.01A28
6.47 1.98A29 2.00
2.95A30 2.96 3.
03A31 3.98 3.00A32
4.97 3.00A33 5.49
2.98A34 5.38 2
．． 95 Next, regardless of the Mg content of the aluminum alloy,
For composite materials whose matrix metal is an aluminum alloy with a Cu content of less than 2%,
For composite materials whose matrix metal is an aluminum alloy with a Cu content of 2% or more and less than 3.5%, which has been subjected to solution treatment for hours and artificial aging treatment at 160°C for 8 hours, A composite material whose matrix metal is an aluminum alloy that has been subjected to solution treatment at ℃ for 8 hours and artificial aging treatment at 160℃ for 8 hours and has a Cu content of 3.5% to 6.5%. For 48
Solution treatment at 0°C for 8 hours and artificial aging treatment at 160°C for 8 hours were performed.

Next, bending test pieces with a length of 501 ffi, a width of 10 m + 10 m, and a thickness of 21 m were cut out from each of the composite materials manufactured and heat-treated as described above, and each bending test piece had a fulcrum distance of 1.
A three-point bending test was conducted at 1140u+. In addition, in these bending tests, the surface stress M/Z (M
- The bending moment at break (Z = section modulus of the bending test piece) was measured as the bending strength of the composite material.
1 The results of this bending test are shown in Table 2) Figures 3 and □ and 4 below.Each value in Table 2 is for aluminum alloys with corresponding Cu and MO contents, respectively. and composite materials. Song - Strength 1 (klJ/a112
), and Figure 3 is shown in Table 2.
−ゞM content based on data 1 ``Rameter 8
(, Cu content and bending strength of composite material ko/m
n+2)! It represents the relationship with □, and the fourth
The figure is based on the data shown in Table 2, with the Cu content as a parameter.
12) and -. Also Table 2) Figure 3 and entry.

11GcMr4"0"'"""°"-"-t h F
t't (7).

Shown as a value rounded to the second decimal place
:,i′,.

・1 There is.
, ; Kai, ; ・■ Self11°・:: ,''n1 Table 2) From Figures 3 and 4, the bending strength of the composite material is C.
When the u content is 1.5% or 6.5%, the IVHI content is relatively low, and the CU content is about 3%.
In the following ranges, the bending strength increases as the Cu content increases, and the bending strength reaches its maximum value when the Cu content is approximately 3 to 5.5%, and when the Cu content is approximately 5%. It can be seen that in the range of .5% or more, the bending strength decreases as the Cu gold content increases. In addition, the bending strength of the composite material is determined by the M9 content of 3
%, it increases as the Ma content increases, and is particularly low when the Mg content is less than 0.2%.

In addition, from each composite material manufactured and heat-treated as described above, length 55m+++1 width 1011. Cut out impact test pieces with a thickness of 101 m, and weigh 5 kg-5+ for each impact test piece.
Using a Schalpi impact tester, the distance between support stands was 11fi 4.
A Charpy impact test was conducted at 0 ms. The results of this ** test are shown in Figure 5.

From Figure 5, *5ifti of the composite material is a higher value as the Cu content of the aluminum ram alloy as the matrix metal is lower, regardless of the MQ content, especially when the CO content is 2 to 3%. is a substantially constant value in the Mg content range of 0 to 2%, decreases rapidly when the Mg content exceeds 2%, and decreases when the Cu content is 4 to 6%. is a substantially constant value in the MO content range of 0 to 1%, but in the MO content range of 1 to 2%, Mg
Slightly decreases with increasing content, with MO content of 2%
It can be seen that when the value is exceeded, the value decreases rapidly.

Furthermore, from Table 2) Figures 3 to 5, the bending strength of composite materials with Cu content and MQ content of 2 to 6% and 0 to 2%, respectively, is A composite material whose matrix metal is a reinforced fiber and an aluminum alloy of JIS Standard 2024, a conventional practical alloy with a composition similar to the composition of the matrix metal of the composite material of the present invention or the JIS standard AC4G, which is a conventional practical alloy. The bending strength of each is 60 ko/m1.82 kg/am2
), but the impact value is equivalent to the impact 1i! of these conventional composite materials. ((each 0.008kG-+e/c
It can be seen that this value is much higher than that of 0.008 kO-m/cm2).

From the results of these bending tests and impact tests, AI-C
u-Mg-based aluminum alloy.8. Two 2□, t8
*. In order to achieve both 11, □ and impact resistance, it is necessary to use Cu in aluminum alloy as a matrix metal.
Content and? 140 content is 2-6% and 0-2, respectively.
%, especially 2-6%, 0.2-1%
It can be seen that the content is preferably 2 to 3%, or 0 to 2%.

Example 2 A bending test and an impact test similar to those of Example 1 were conducted, except that the volume fraction of carbide silica fiber was set to 10%! ! 1 and a composite material manufactured under the same conditions. The results of this bending test are shown in Table 3 below, and FIGS. 6 and 7, and the results of the ** test are shown in FIG. 8. Table 3 and FIGS. 6 to 8 correspond to Table 2) and FIGS. 3 to 5 in Example 1, respectively.

Further, in Table 3, FIGS. 6 and 7, the Cu content and Mg content are respectively shown as values rounded to the second decimal place.

From Table 3, Figures 6 and 7, the bending strength of the composite material in this example is compared regardless of the MO content when the Cu content is 1.5% or 6.5%. This is a relatively low value, and Cu
In the range where the content is about 3% or less, the bending strength increases as the Cu content increases, and when the CO content is in the range of about 3 to 5.5%, the bending strength reaches its maximum value. Cu content is about 5
．． It can be seen that in the range of 5% or more, the bending strength decreases as the Cu content increases. It can also be seen that the bending strength of the composite material increases as the MO content increases when the Mg content is 3% or less, and is particularly low when the Ma content is less than 0.62%.

Also, from FIG. 8, the composite material l1111w1 is Example 1.
The value is higher overall than in case 2, and the lower the Cu content of the aluminum alloy as the matrix metal, the higher the value regardless of the MO content, especially when the Cu content is 2 to 3%. In some cases, M (+ content - is a substantially constant value in the range of 0 to 2%, and when the Mg content exceeds 2%, it decreases rapidly, and the Cu content is 4 to 6%.) %, it is a substantially constant value in the range of Mg content from 0 to 1%, but when the MO content is in the range from 1 to 2%, Mg
It decreases slightly as the g content increases, and the Ma content decreases to 2.
It can be seen that when the value exceeds %, it decreases rapidly.

ゞ1°゛1°0〜181i! ! l′″°゛0“*! ff
i′″:・Mg content is 2 to 6% and 0 to 6%, respectively.
The bending strength of the composite material, which is 2%, is higher than that of conventional practical alloys when silicon carbide whiskers with a volume fraction of 10% are used as reinforcing fibers.
JISM rating AC4C (7) A/L/S, : 6 alloy 8V 1 The bending strength of the composite material made of 1 trix metal is higher than 44ka'/l112, and the silicon carbide with a volume fraction of 30% is 1; ,
5□, 85, o, 1゜wa. . circle. '□iConventional metals with a composition similar to that of SiMatrix metal
i′, 1・4 JIS standard 2024 aluminum alloy, which is a practical alloy
Bending of composite materials with TOM alloy as matrix metal
l゛1'; The strength is equivalent to 55 ka/■1, but the IN impact value is :)ll The impact value of these conventional composite materials (each 0.0
'1 7ko-e 7cm", 0.01
5kg-m/co2)
) 1. It can be seen that this value is extremely high compared to .
1ゝ:,) Based on the results of these bending tests and impact tests, the fiber
, □4; In order to achieve both strength and impact resistance in a composite material that uses silicon carbide voice reinforcement fibers with a composite volume ratio of 10% and an AI-Cu-Mg-based aluminum alloy as a matrix metal, The Cu content and Mg content of the aluminum alloy as a matrix metal are preferably 2 to 6% and 0 to 2%, respectively, particularly 2 to 6%.
%, 0.2-1% or 2-3%, 0-2%.

Example 3 A bending test and an impact test similar to those of Example 1 were conducted on silicon carbide a11. The test was conducted on a composite material manufactured in the same manner and under the same conditions as in Example 1, except that the volume fraction of H was set to 5%. The results of this bending test are shown in Table 4 below, and FIGS. 9 and 10, and the results of the impact test are shown in FIG. 11. Table 4 and FIGS. 9 to 10 respectively correspond to Table 2) and FIGS. 3 to 5 in Example 1. *tc In Table 4, FIGS. 9 and 10, the C1 content and Mg content are each shown as values rounded to the second decimal place.

From Table 4, FIG. 9, and FIG. 10, it can be seen that in this example,
Decomposition material 17) lfll, f'J g□. . Mg if content #1.5'% or 6.5%
It is a relatively low value regardless of the content, and the Cu content is about 3
% or less, the bending strength increases as the Cu content increases, and the bending strength reaches its maximum value in the Cu content range of approximately 3 to 5.5%. About 5.5% or more! ! It can be seen that the bending strength decreases with increasing Cu content. Furthermore, it can be seen that the bending strength of the composite material increases as the Mg content increases in the range of Mg content of 3% or less, and is particularly low when the Mg content is less than 0.2%. .

Also, from Figure 11, the impact value of the composite material is
.

The value is higher overall than in cases 1 and 2, and the lower the Cu content of the aluminum aluminum alloy as the matrix metal, the higher the value is regardless of the M (+ content, especially Cu
When the content is 2 to 3%:,・ is substantially in the range of 0 to 2% of MQ-containing trowel.
, :.

It is a constant value, and decreases rapidly when the Mg content exceeds 2%, and when the Cu content is 4 to 6%, it is 1. 'When the MO content is in the range of 0 to 1%, the value is substantially constant, but when the Ma content is in the range of 1 to 2%, it decreases slightly as the Mg content increases. It can be seen that when the Mg content exceeds 2%, it decreases rapidly.

Furthermore, from Table 4 and Figures 9 to 11, Cu content and MC
The bending strength of the composite material, which has an I-containing content of 2 to 6% and 0 to 2%, respectively, is based on silicon carbide whiskers with a volume fraction of 5% as reinforcing fibers, and a conventional practical alloy, JIS standard AC4C. The bending strength is higher than 39kQ/1112 of a composite material using aluminum alloy as the matrix metal, and the volume fraction is 5.
% of silicon carbide voice strength as the reinforcing fibers, and the matrix metal is an aluminum alloy of JrSM rating 2024, which is a conventional practical alloy with a composition similar to the composition of the matrix metal of the composite material of the present invention. 53k
cl/al12J knee same Wi (1) Wl tct5 le f
fi, ** value 4.1 <- ** value of these conventional composite materials (0.018 ka-m/c 1.0.018 ka, respectively)
-1/c1)k: It can be seen that this is a much higher value.

Based on the results of these bending tests and impact tests, AI-Cu
``In order to achieve both strength and impact resistance in a composite material that uses Mg-based aluminum alloy as a matrix metal, the Cu content and MO content of the aluminum alloy as the matrix metal must be 2 to 6%, respectively. , 0-2
%, especially 2-6%, 0.2-1%
It can be seen that the content is preferably 2 to 3%, or 0 to 2%.

Example 4 First, a continuous region M of silicon carbide (Nicalon manufactured by Nippon Carbon Co., Ltd., fiber diameter 10 to 15 μm) was cut into approximately 51111 pieces to form silicon carbide cord fibers, and the silicon carbide short fibers were After adding polyvinyl alcohol as an organic binder to the aggregate, compression molding was performed on the aggregate, and the compression molded product thus obtained was heated in the air for 600 min.
The polyvinyl alcohol was evaporated by heating at ℃ for 1 hour, thereby producing a fiber molded body having dimensions of 38 x 100 x 16 mm and a fiber volume percentage of 15% in which individual silicon carbide short fibers were oriented in a substantially two-dimensional random manner. Formed.

Next, aluminum alloy 81 formed in Example 1
~834 and as described above (using the formed fiber molded body, high-pressure casting was carried out in the same manner and under the same conditions as in Example 1, using silica carbide fibers as reinforcing fibers and aluminum alloy as matrix metal. A composite material having a volume fraction of 15% was manufactured. Each composite material was then subjected to solution treatment and artificial aging treatment under the same conditions as in Example 1, and bending test pieces and Ijs were obtained from each composite material. A test piece was cut out, and a bending test and a Charpy impact test of the composite material were conducted on each bending test piece and impact test piece in the same manner and conditions as in Example 1.The bending test piece and the impact test piece were 50X10+nm, 55X1 respectively
(The plane of Mm was formed parallel to a two-dimensional random plane, and the notch of the WfI impact test piece was formed in a plane perpendicular to the two-dimensional random plane.

The results of this bending test are shown in Table 5 and Figure 12 below.
) and Figure 13, and the results of the impact test are not shown in Figure 14.
9. Table 5 and FIGS. 12 to 14 correspond to Table 2) and FIGS. 3 to 5 in Example 1, respectively.

Also, in Table 5, Figures 12 and 13, cu
1 content ω and Mg content are respectively its decimal point 2
The value is rounded to the nearest whole number.

garden :: ・( 1′ [Pa: :1 '1)1. .

From Table 5, Figures 12 and 13, it can be seen that the bending strength of the composite material in this example was 1°5% or 6.5% when the Cu content was 1°5% or 6.5%.
%, it is a relatively low value regardless of the Mg content,
In the range where the Cu content is about 4% or less, the bending strength increases as the Cu content increases, and the Cu content is about 4 to 5.5%.
It can be seen that the bending strength reaches its maximum value in the Cu content range of approximately 5.5% or more, and that the bending strength decreases as the Cu content increases. Furthermore, it can be seen that the bending strength of the composite material increases as the MO content increases in the MO content range of 3% or less, and is particularly low when the Mg content is less than 0.2%. .

Moreover, from FIG. 14, the impact value of the composite material is higher than that of Example 1 as a whole, but lower than that of Examples 2 and 3, and the Cu content of the aluminum ram alloy as the matrix metal is The lower the value, the higher the value regardless of the MO content, especially when the Cu gold content is 2 to 3%.
It is a substantially constant value in the range of 0 to 2% of Cu content, and when the MQ-containing fabric exceeds 2%, it decreases rapidly, and Cu
When the content is 4 to 6%, the value is substantially constant in the Mo content range of 0 to 1%, but when the Mg content is in the range of 1 to 2%, It can be seen that as the Mg content increases, it decreases slightly, and when the MO content exceeds 2%, it decreases rapidly.

Furthermore, from Table 5 and Figures 12 to 14, Cu content and M
The bending strength of composite materials with a g content of 2 to 6% and 0 to 2%, respectively, is determined by using silicon carbide IJAH with a volume fraction of 15% as reinforcing fibers and using JrSM grade AC4, a conventional practical alloy.
The bending strength of the composite material using aluminum alloy G as the matrix metal is higher than 49ko/s1, and the volume fraction is 1
Bending of a composite material using 5% silicon carbide*vn fibers as reinforcing fibers and a matrix metal of aluminum alloy of JIS standard 2o24, which is a conventional practical alloy with a composition similar to that of the matrix metal of the composite material of the present invention. strength 64
kg/a++al, but the impact value is the same as that of conventional composite materials (o, 01 ko, respectively).
-s /c1.0.009k(+-m/am2) l
It can be seen that the value is much higher than that of c.

From the results of these bending tests and impact tests, it was found that silicon carbide known fiber with a fiber volume percentage of 15% was used as the reinforcing fiber and AI-Cu
- In order to achieve both strength and impact resistance in a composite material using MQ-based aluminum alloy as a matrix metal, it is necessary to
U content and Mg content are 2-6% and 0-2%, respectively.
It can be seen that the content is preferably 2 to 6%, 0.2 to 1%, or 2 to 3%, or 0 to 2%.

1" LL The bending test and impact test were conducted in the same manner as in Example 4, except that the volume fraction of silicon carbide 11M was set to 20%. Composite materials manufactured under these conditions were tested. The results of this bending test are shown in Table 6, Figures 15 and 16 below! The results of the I-hit test are shown in Figure 17. Table 6, Figures 15 to 1
7 corresponds to Table 2) and FIGS. 3 to 5 in Example 1, respectively. Further, in Table 6, FIG. 15, and FIG. 16, the Cu content and M9 content are shown as values rounded to the second decimal place.

From Table 6, FIG. 15, and FIG.
%, it is a relatively low value regardless of the Ma content range,
In a range where the Cu content is about 4% or less, the bending strength increases as the Cu content increases, and the C1 content is about 4 to 5.5%.
It can be seen that the bending strength reaches its maximum value in the Cu content range of approximately 5.5% or more, and that the bending strength decreases as the Cu content increases. In addition, it can be seen that the bending strength of the composite material increases as the Ma content increases in the range where the MO content is 3% or less, and it is particularly low when the Mg content is less than 0.2%. .

Moreover, from FIG. 17, the impact 1jl value of the composite material is higher than that of Example 1 as a whole and lower than that of Examples 2 to 4, indicating that the Cu content of the aluminum alloy as the matrix metal The lower the value, the higher the value regardless of the Mg content, and especially when the Cu content is 2 to 3%, the MO content is substantially constant in the range of 0 to 2%. The value decreases rapidly when the Mg content exceeds 2%, and when the Cu content is 4 to 6%, the value for Mg content is 0 to 6%.
In the range of 1% Mg content, the value is substantially constant, but in the range of 1 to 2% Mg content, it decreases slightly as the Ma content increases, and when the Mg content is 2%.
It can be seen that when it exceeds □, it decreases rapidly.

Furthermore, from Table 6 and Figures 15 to 16, Cu-containing
The bending strength of composite materials with 2% to 6% Mg content and 0 to 2% Mg content, respectively, is the same as that of charcoal with a volume fraction of 20%.
□ Silicon oxide short fibers are used as reinforcing fibers to create conventional practical alloys.
JIS standard AC4G aluminum alloy which is 1□.

(Bending strength of composite material used as matrix metal 51
1□'k (higher than 1/IIag, and volume fraction 20%
Carbonization of 1≧ Iron short fibers are used as reinforcing fibers, and the composite material of the present invention is
``Conventional metals with compositions similar to those of the matrix metal.
[Bending of composite materials whose matrix metal is aluminum laminate according to JIS standard 2024, which is a practical alloy.] The strength is equivalent to 66 ko/11, but the value of 0 is: Impact of these conventional composite materials Value (0.009 kO-va/cm”, respectively)
0.008kg-r*/cm2) It can be seen that this value is much higher than that of IC.

From the results of these bending tests and impact tests, it was found that silicon carbide short fibers with a fiber volume percentage of 20% were used as reinforcing fibers and AI-Cu
- In order to achieve both strength and impact resistance in a composite material using a Ma-based aluminum alloy as a matrix metal, it is necessary to
U content and MO content are 2-6% and 0-2%, respectively.
It can be seen that the content is preferably 2% to 6%, 0.2% to 1%, or 2% to 3%, or 1% to 2%.

Example 6 A bending test similar to the bending test and impact test of Example 4 and! The Is test was conducted on a composite material manufactured in the same manner and under the same conditions as in Example 4, except that the volume fraction of the silicon carbide fiber was set at 40%. The results of this bending test are shown in Table 7 below, and FIGS. 18 and 19, and the results of the impact test are shown in FIG. 20. Table 7, Figures 18 to 20
The figures correspond to Table 2) Figures 3 to 5 in Example 1, respectively.

From Table 7, Figures 18 and 19, it can be seen that the bending strength of the composite material in this example was 1°5% or 6.5% when the Cu content was 1°5% or 6.5%.
%, it is a relatively low value regardless of the Mg content, and in the range where the Cu content is about 4% or less, the bending strength increases as the Cu content increases, and the Cu content increases. Approximately 4-5.
It can be seen that the bending strength reaches its maximum value in the range of 5%, and that the bending strength decreases as the Cu content increases in the range of about 5.5% or more. In addition, the bending strength of the composite material increases as the Mg content increases in the range below Mill content%, especially when the MO content is 0.2%.
It can be seen that the value is low below.

Also, from FIG. 20, the composite material impact 9jIW1 of Example 1
The value is lower overall than in the case of 2 to 5, and the lower the Cu content of the aluminum aluminum alloy as the matrix metal, the higher the value regardless of the M (J content), especially when the CIJ content is 2 to 5. When it is 3%, it is a substantially constant value in the range of MO content from 0 to 2%, and when the Mg content is 2%,
When the C(I content is 4 to 6%, the MQ content is 0 to 2%, the M(J
Slightly decreases with increasing content, Mg content is 2%
It can be seen that when the value is exceeded, the value decreases rapidly.

Furthermore, from Table 7 and Figures 18 to 20, Cu content and M
The bending strength of composite materials with a Q content of 2 to 6% and 0 to 2%, respectively, is determined by using silicon carbide short fibers with a volume fraction of 40% as reinforcing fibers and using JIS standard AC4C aluminum, which is a conventional practical alloy. Bending strength of composite material using alloy as matrix metal is 75kQ/u+1! The reinforcing fiber is silicon carbide known fiber with a volume fraction of 40%, and aluminum alloy of JrS standard 2024, which is a conventional practical alloy with a composition similar to that of the matrix metal of the composite material of the present invention, is used as the matrix metal. The bending strength of the composite material is 92
ko/mm2, but the impact value is the same as that of these conventional composite materials (0.005 kO-s, respectively).
/cyl12.0.005k(+-to /cta2)
It can be seen that the value is significantly higher than that of .

From the results of these bending tests and impact tests, it was found that silicon carbide short fibers with a fiber volume ratio of 40% were reinforced with Ii! Maintenance Al −
CI-M! In order to achieve both strength and impact resistance in a composite material using an I-based aluminum alloy as a matrix metal, the Cu content and MO content of the aluminum alloy as the matrix metal should be 2 to 6%, respectively. 0
~2% is preferable, especially 2~6%, 0.2~
It can be seen that 1%, 2-3%, and 0-2% are preferable.

The same bending tests and impact tests as in Examples 4 to 6 were conducted on silicon carbide obtained by cutting the continuous silicon carbide fibers used in these Examples into approximately 1c+s. A bending test piece and an impact test in which the reinforcing fibers were made of a common miscellaneous material, each silicon carbide short fiber was oriented in a substantially two-dimensional random manner, and the maximum surface area of each test piece was formed along a two-dimensional random plane. When the sample was also tested, results similar to those of these Examples were obtained.

Example 7 From each of the above examples, the Cu content of the aluminum alloy is 2
Since it was found that the MCICu content is preferably ~6% or less and the MCICu content is ~2%, we will investigate what value is appropriate for the volume percentage of the silicon carbide short fibers that are reinforcing fibers. In order to achieve this, an aluminum alloy with Cu content and MO content of 4% and 1%, respectively, and the remainder being substantially Al, was used as the matrix metal, silicon carbide voice force was used as the reinforcing fiber, and the fiber volume percentage was 0% and 5%. %, 10%,
25%, 30%, 40%, and 50% composites were manufactured in the same manner and under the same conditions as in Example 1 above, and each composite was heated at 480°C for 8 hours. After solution treatment and artificial aging treatment at 160°C for 8 hours, two bending test pieces with the same dimensions as in Example 1 were cut out from each composite material, and each bending test piece was subjected to Example 1. A bending test was conducted using the same procedure and conditions as in the case of .

□, :. １□１□１゜□２４． □,.
1 From Fig. 21, in the range of fiber volume fraction from 0 to 5%, the bending strength of the composite material remains substantially constant even if the fiber volume fraction increases, and aluminum, which is the matrix metal, This value is essentially the same as the bending strength of the alloy, and in the range of fiber volume percentage from 5 to 40%, the bending strength increases almost linearly and significantly as the fiber volume percentage increases. It can be seen that when the volume fraction exceeds 40%, the rate of increase in bending strength as the fiber volume fraction increases gradually decreases.

For reference, a composite material whose matrix metal is an aluminum alloy in which the Cu content is 2%, the Mg content is 0.2%, and the remainder is substantially Al, and the Cu content is 6%. A similar bending test was performed on a composite material whose matrix metal was an aluminum alloy with an MO content of 2% and the remainder being substantially Al, and the results showed the same tendency as shown in Figure 21. The results were obtained.

Further, silicon carbide short fibers similar to those used in Examples 4 to 6 above were used as reinforcing fibers, and the Cu and Mg contents were 4% and 1%, respectively, and the remainder was substantially Al. When a similar bending test was conducted on a composite material, results showing the same tendency as the results shown in FIG. 21 were obtained.

From these results, the Cu content is 2 to 6%, and the MQ
In a composite material in which the matrix metal is an aluminum alloy with a content of 0 to 2% and the remainder is substantially Al, and the reinforcing fibers are silicon carbide short fibers, the fiber volume percentage of the silicon carbide short fibers is It can be seen that it is preferable that the amount is 5 to 50%, particularly 5 to 40%.

In the above, several embodiments of the present invention have been described in detail in connection with the experimental research conducted by the inventors of the present application, but the present invention is limited to these embodiments. However, other methods within the scope of the present invention
:'Y4.6ka78°, 1a. Yu,! : tt a
＊ ＊c9. □“It should be obvious.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a fiber molded body in which individual silicon carbide voice forces are oriented substantially three-dimensionally at random, and Figure 2 is a high pressure applied using the fiber molded body shown in Figure 1. Figure 3 shows the casting process of the manufacturing process of composite materials by casting, and Figure 3 shows the relationship between Cu gold cooling and the bending strength of the composite material using the Mg content as a parameter based on the bending test results of Example 1. Graph, Figure 4 is a graph showing the relationship between Mg content and bending strength of the composite material using the GO-containing trowel as a parameter based on the results of the bending test of Example 1, and Figure 5 is the result of the vis test of Example 1. FIG. 6 is a graph showing the relationship between Cu content and bending strength of the composite material based on the bending test results of Example 2, with Mg content as a parameter, and FIG. 7 is a graph showing the relationship between Cu content and bending strength of the composite material based on the bending test results of Example 2. Based on the results of
A graph showing the relationship between the M(+ content and the bending strength of the composite material, with the content as a parameter.
A graph showing the results of the i-impact test, FIG.
A graph showing the relationship between the content and the bending strength of the composite material, and FIG. 10 is a graph showing the relationship between the Mg content and the bending strength of the composite material using the Cu content as a parameter based on the bending test results of Example 3. , Fig. 11 is a graph showing the results of the *S test of Example 3, and Fig. 12 is a graph showing the results of the bending test of Example 4, and the relationship between Cu content and bending strength of the composite material using Mg content as a parameter. Figure 13 is a graph showing the relationship between the Mg content and the bending strength of the composite material using the Cu content as a parameter, as revealed by the results of the bending test of Example 4, and Figure 14 is the impact strength of the composite material in Example 4. A graph showing the test results, FIG. 15 is a graph showing the results of the bending test of Example 5.
A graph showing the relationship between the Cu content and the bending strength of the composite material using the Q gold content as a parameter.
A graph showing the relationship between the content and the bending strength of the composite material, FIG. 17 is a graph showing the results of the impact test of Example 5,
Figure 8 is a graph showing the relationship between Cu content and the bending strength of the composite material based on the bending test results of Example 6, with Mg content as a parameter, and Figure 19 is a graph based on the bending test results of Example 6. Figure 20 is a graph showing the relationship between the Mg content and the □ bending strength of the composite material using Cu gold absorption as a parameter.
Figure 1 is a graph showing the results of the bending test of Example 7, with the horizontal axis representing the fiber volume fraction of silicon carbide whiskers and the vertical axis representing the bending strength of the composite material. 1...Silicon carbide voice force, 2...am molded body, 3
... Mold, 4. Mold cavity, 5. Molten aluminum alloy, 6. Plunger patent applicant: Toyota Motor Corporation representative.
Attorney Patent Attorney Akashi 8
Acid Figure 1 i: Figure 2 (Figure 3 Cu content (%) Figure 4 M9 content (%) Figure 5 MG content (%) Figure 6 Cu content (%) Figure 7 M99 Fig. 8 ug content (%) Fig. 9 Cu gold content c%) Fig. 10 I M<1 content (%) [' Fig. 1I M content (%) Fig. 12 Cu Content 1%) Fig. 13 MQ content CI/l) Fig. 14 M9 content (%) Fig. 15 Cu content (%) Fig. 16 M9 content (%) Fig. 17 MQ content C% ) Figure 18 Cu content (%) 1" Figure 19 M9 content (% 1 Figure 20 M9 content c%) Figure 21 Fiber volume percentage (%) (Voluntary) Procedural amendment 1985 7 May 29th 1, Incident Display 1985 Patent Application No. 120788 2
) Name of the invention Silicon carbide short fiber reinforced aluminum alloy 3, Relationship to the amended person's case Patent applicant address 1 Toyota-cho, Toyota City, Aichi Prefecture Name (3)
20) l-Yota Jidosha Co., Ltd. 4, Agent Address: 1-5119 Shinkawa, Chuo-ku, Tokyo 0104 □3rd floor, Nagaoka Building, Kayabacho Telephone: 551-4171
6. Number of inventions increased by amendment 07. Subject of amendment Details 5iao'tntr
, ;8. Contents of the amendment As shown in the attached sheet (1) ro from page 21, line 20 to page 22, line 1 of the specification.
, 008kQ m /amQ, 0.008kQ-I
II/i' to ro, 08ko-1/aj', 0.0
8ka-m/l". (2) [0,017k on page 26, lines 17 to 18]
g-m/, X9.0.015kO-1m/am'J to 'o.
Correct it with J. (3) [0,018k on page 31, lines 18 to 19]
Q-II/01', 0.018kq-m/aIJ
0゜18 ka-m/amQ, 0,18 k
Correct as a-m /IXIIJ. (4) 37th negative line 18th to 19th line 10.01 +
II/cs+', 0.009kQ-1/am'J ti
: fo. 1 kom/ax', 0.09kom/a
Correct with cuJ. (5) [0,009k on page 42, lines 18 to 19]
Ol 101Q, 0.008k(l I /LX”J
"0゜09kO-111019,0,08k(1-I
Correct it as ll /am'J. (6) “0.005k” on page 46, lines 16-17
G-1/C! l', 0.005k (1-ta 10IJ
Woro. 05kg-m/lj1! , O-05kO-1/, 9J. (7) Correct each of FIG. 5, FIG. 8, FIG. 11, FIG. 14, FIG. 17, and FIG. 20 as shown in the attached sheet. □ Fig. 5 M9 content 1 (%) Fig. 8 f "gtllJL (2', ÷ :1 Fig. 11 M9 content (%) Fig. 14 MQ content i (%) Fig. 17 M9 content j1 (%) Figure 20 Contains M9! ('/,)

Claims (5)

[Claims] (1) Silicon carbide short fibers are used as reinforcing fibers, an aluminum alloy having a Cu content of 2 to 6%, an Mg content of 0 to 2%, and the remainder being substantially Al is used as a matrix metal, and the silicon carbide A silicon carbide short fiber reinforced aluminum alloy in which the volume fraction of short fibers is 5 to 50%. (2) The silicon carbide short fiber reinforced aluminum alloy according to claim 1, wherein the volume fraction of the silicon carbide short fibers is 5 to 40%. (3) In the silicon carbide short fiber reinforced aluminum alloy according to claim 1 or 2, the Mg content of the aluminum alloy is 0.2 to 2%. Fiber reinforced aluminum alloy. (4) In the silicon carbide short fiber reinforced aluminum alloy according to claim 3, the Mg content of the aluminum alloy is 0.2 to 1%. . (5) In the silicon carbide short fiber reinforced aluminum alloy according to claim 1 or 2, the aluminum alloy has a Cu content of 2 to 3% and a Mg content of 0 to 2%.
% silicon carbide short fiber reinforced aluminum alloy.