TW200533763A - Aluminum alloy for plastic working, and its manufacturing method - Google Patents

Abstract

The objective of the present invention is to provide an aluminum alloy for plastic working, which are useful for high performance members, such as automotive parts, fishing gears, golf clubs and snow boards, and has high tensile strength, high Young's modulus and high ductility, and to provide its manufacturing method. A powder mixture is prepared by mixing 10 to 25wt.% alumina with an aluminum alloy powder having a composition consisting of, by weight, 0.4 to 2.0% Si, 0.4 to 2.0% Mg, 0.5 to 2.0%, in total, of one or more elements selected from among Fe, Mn and Cr, and the balance Al with inevitable impurities. The powder mixture is compacted at room temperature, and the resultant green compact is vacuum degassed at 200 to 450 DEG C and further sintered at a high temperature of 500 to 600 DEG C. The resultant sintered compact is pressure sintered and then forged. By this method, a structural member as a finished product having ≥ 80 GPa Young's modulus at room temperature, ≥ 300 MPa tensile strength at room temperature after water quenching treatment and ≥ 5% elongation can be obtained.

Description

200533763 (1) IX. Description of the invention [Technical field to which the invention belongs] The present invention relates to plastic processing with high tensile strength, high elastic coefficient, and high ductility as high-performance materials such as bicycle components, fishing tackles, golf clubs, and snowboards. Use aluminum alloy and its manufacturing method. [Previous technology] I Recently, attempts have been made to add and disperse ceramics in aluminum alloy powder obtained by the rapid solidification method in order to improve its characteristics, especially rigidity. For example, review the composition of A1-high Si-based, Al-Fe-Mo-based, Al-Cu-based, Al-Si-Mg-based, or Al-Zn-Mg-based (see Patent Document 1) ° In addition, when the When the aluminum alloy is subjected to hot forming processing such as extrusion or forging, the powder formed body obtained by the pre-cold working step contains hydrate and air inside or on the surface. If hot φ processing is directly performed, it may sometimes occur in Defects such as air bubbles (fluffy) are generated during thermal processing or subsequent heat treatment steps. For the reasons described above, in order to avoid the formation of a defect ', degassing is generally performed before hot working. [Patent Document 1] Japanese Patent Bulletin No. 2 5 4 6 6 60 (Scope of patent application) [Summary of the Invention] [Questions to be Solved by the Invention] In traditional aluminum alloys, such as bicycle components, fishing tackles, and golf 200533763 (2 High-performance materials such as clubs and snowboards have problems that cannot effectively obtain effective high tensile strength, local elastic coefficient, and high ductility. The present invention has been developed in view of the above problems, and an object of the present invention is to provide a high tensile strength, a high elastic coefficient, and a high ductility as high-performance materials such as bicycle members, fishing tackles, golf clubs, and snowboards. Aluminum alloy for plastic processing and manufacturing method thereof. [Means for Solving the Problems] In order to solve the above problems, the invention described in the first patent application scope of the present application is characterized in that: it is composed of: 0.4 to 2.0% by weight of Si, 0.4 to 2.0% by weight of Mg; and One or more of Fe, Mn, and Cr are selected from a total of 0.5 to 2_0% by weight, and the remainder contains unavoidable impurities of A1, which is an aluminum alloy powder formed of A1; and i 0 to 25% by weight of alumina is solidified and mixed. Material, the coefficient of elasticity at room temperature is 80 GPa or more, and the room temperature tensile strength after water quenching is 300 MPa or more, and the ductility is 5% or more. The invention described in the second patent application scope of this case is an aluminum alloy for plastic working as described in the first patent application scope, wherein the above-mentioned Ming alloy powder is composed of si containing 0.4 to 2.0 weight ° / Q, Alloy powder formed from 0.4 to 2.0% by weight of Mg, 0.10 to 0.3% by weight of Fe, 0.05 to 0.6% by weight of Mn, and 0.05 to 0.6% by weight of Cr A1. In this case, the reason why the amount of Si added is 0.4 to 2.0% by weight is that the addition of Si will form a compound Mg2Si with Mg, and the minimum addition amount required to make the strength of the aluminum matrix after heat treatment is 300 MPa or more 0.4 200533763 (3) wt%, and if the amount of Si added exceeds 2.0 wt%, stretchability of more than 5% cannot be obtained, which causes problems in forging processing. In addition, the reason why the amount of Mg added is 0.4 to 2.0% by weight is that Mg needs to be added in order to form a compound Mg2Si that can improve the strength after heat treatment, and the minimum amount required to obtain a tensile strength of 300 MPa or more is 0. 4% by weight, and once Mg is added in an amount exceeding 2.0% by weight, the plastic workability will be reduced.

Fe will form an Al_Fe-Si compound with Si, and the reduction of excess Si will lead to the adverse effect of reduced extensibility. The reason why Fe is added in an amount of 0.10 to 0.3% by weight is that when the added amount is less than 0.10% by weight, the microstructure effect of the atomized powder disappears, and if the added amount exceeds 0.3% by weight, the stretchability will decrease. The addition of Mn and Cr has the effect of suppressing the coarsening of the structure due to hot working by the addition of appropriate amounts. The reason why the addition amounts of Mn and Cr are 0.05 to 0.6% by weight is as follows. If the addition amount is less than 0.05% by weight, the above effect will not be obtained, and if the addition amount exceeds 0.6% by weight, the ductility will be reduced. In addition, the addition amount of alumina is 10 to 25% by weight to increase the elastic coefficient and abrasion resistance. This is because once the addition amount is less than 10% by weight, the elastic coefficient will decrease, and if it exceeds 25% by weight %% causes a decrease in stretchability. The invention described in item 3 of the patent application scope is an aluminum alloy for plastic working as described in item 1 or 2 of the patent application scope, wherein the average particle diameter of the aluminum alloy powder is 10 to 150 // m, and the average of the alumina is Particle size 5 ~ 20 // 200533763

In the present invention, the reason why the average particle diameter of the aluminum alloy powder is 10 to 150 // m is because once the average particle diameter is less than 10 # m, aggregation will be formed between the aluminum alloy powders, and it is difficult to form an average with the alumina. Mixing results in uneven strength and stretchability and affects plastic workability. If it exceeds 1 5 0 // m, the number of coarse particles will increase, and it will not be easy to evenly disperse the alumina, resulting in increased strength and The uneven stretchability affects plastic workability. In addition, the reason why the average particle size of alumina is 5 to 20 μm is to improve the coefficient of elasticity and abrasion resistance. This is because once the average particle size of alumina is less than 5 // m, it cannot be mixed evenly, and Once it exceeds 20 // m, a large amount of coarse alumina will be formed, resulting in a decrease in stretchability and plastic workability. The invention described in item 4 of the scope of the patent application is a method for manufacturing the above-mentioned aluminum alloy for plastic working, which is characterized by comprising 0.4 to 2.0% by weight of Si and 0.4 to 2.0% by weight of Mg; and Mn, Cr, or more than one selected from a total of 0.5 ~ 2 · 0% by weight, and the remaining portion of the aluminum alloy powder formed by A1 containing unavoidable impurities is mixed with 0 ~ 25% by weight of alumina, and at room temperature The mixed powder is pressure-molded in a state, and the formed body is vacuum degassed at 200 to 450 ° C, and the molded body sintered at a high temperature of 500 to 600 t: is subjected to pressure sintering. Here, After forging, the elasticity coefficient at room temperature is 80 GPa or more, the room temperature tensile strength after water quenching is 300 MPa or more, and the ductility is 5% or more. Structural components of the finished product. -8-200533763 (5) [Effects of the invention] According to the present invention, it has useful local tensile strength and high elastic coefficient for high-performance materials such as bicycle components, fishing tackles, golf clubs, and snowboards. The content of aluminum is 10% by weight and the stretchability is less than 5%. In the present invention, the content of alumina is 10% by weight or more. The stretchability can reach 8%. It has good ductility and is suitable for plastic processing. . In addition, after degassing, it is possible to suppress the reabsorption of gas without generating processing defects such as bubbles (fluffy), and an aluminum alloy for plastic processing can be obtained. [Embodiment] Hereinafter, a preferred embodiment of a method for manufacturing an aluminum alloy for plastic working according to the present invention will be described in detail with reference to Fig. 1. First, an aluminum alloy rapid solidification powder is produced {step 1-1, aluminum alloy powder manufacturing process}. The aluminum alloy rapid solidification powder is composed of 0.4% to 2.0% (for example, 0.8%) by weight (hereinafter referred to as%). Si, 0.4 to 2.0% (e.g. 1.0%) Mg; and one or more selected from Fe, Mn, and Cr for a total of 0.5 to 2.0% (e.g., 0.15% Fe, 0.05% Mn, 0.3% Cr) , The remainder is formed by A1 containing unavoidable impurities. The method for producing the rapidly condensed solid powder may use the production methods such as the atomization method, the melt spinning method, the rotary disk method, and the rotary electrode method that are well known in the industry. In the present invention, the mist is used from the viewpoint of industrial production. Method (especially gas atomization method). In addition, when making this aluminum alloy powder, taking into account uniform mixing, variations in strength and elongation, the average particle diameter of the aluminum alloy powder is preferably 10 to 150 // m. The reason is that once the -9-200533763 (6) average particle diameter of the aluminum alloy powder is less than 10 m, aggregation will occur between the aluminum alloy powders to uniformly mix the aluminum alloy powders. In addition, if the aluminum alloy powders are The average particle size of more than 15 0 ν m will increase a large number of coarse particles, and it is difficult to evenly disperse the oxyaluminum, resulting in a large increase in the amount of unevenness in strength and ductility, which adversely affects plastic workability. Second, a straight groove mill (pod mill) is used to mix 10 ~ 25% (for example, IS%) average particle size of 5 ~ φ // m (for example, 15 // m) alumina into the above-mentioned aluminum alloy rapid solidification powder. (The mixed powder obtained after Ahoy was subjected to cold isostatic pressing (Cold Isostatic Pressi) to form temporary forming {steps 1-2, pressure forming process}. In this hair, the average particle diameter of AI2O3 is 5 ~ 20 // m is because once the average grain size is less than 5 // m, it will not be able to mix uniformly. If it exceeds 20 // m, the amount of coarse A1203 will be formed, resulting in a decrease in elongation and plastic workability. Next, Degassing the temporarily formed mixed powder by vacuum suction {steps 1-3, degassing treatment process}. As the φ degassing treatment while heating will help the gas removal, it can also perform partial sintering. Yes Vacuum degassing is performed at 200 ~ 45 ° C. Once the temperature in the furnace exceeds 200t, the gas and moisture absorbed by the temporarily formed body can be removed. If the temperature in the furnace exceeds 300 ° C, hydrates will be decomposed and removed. Temperatures above 45 (TC, but also temporarily When the temperature of the shape exceeds 45 0 ° C, sintering will occur, which will cause blockage between the powder inside the shape temporarily after the air and moisture are removed. Therefore, in the present invention, in order to perform sufficient degassing before the sintering starts, The shaped body is kept in a furnace at a temperature of 400 ° C for 1 to 6 hours (for example, 1.5 hours). It is difficult to homogenize and cold 20 ng. The superb appearance of the bright path is -10- 200533763. (7) Next, press the sintered compact at a high temperature of 500 to 600 (for example, 5 to 50) for 1 to 6 hours (for example, 4 hours) by using a hot extrusion or hot rolling step. Sintering {Step 1-4 'Pressure sintering process}. In this pressure sintering process, once the temperature is less than 50 ° C, oxides and the like covering the surface of the powder will affect the sintering due to the slow sintering speed. It is delayed, so it is best to heat it to the above temperature (55 (TC) or higher. If the temperature is higher than the above temperature (550 ° C), the powder itself will be softened to melt part of the surface. Liquid that will cover the powder from the table Notches such as oxides ooze out and bury the gaps between the powders, which promotes rapid sintering. In addition, once the temperature is maintained above 600 ° C, the alloy powder will melt, which will significantly reduce the mechanical properties of the hot-worked material. If the holding time is less than 1 hour, it cannot be fully sintered, so the holding time must be more than 1 hour. Conversely, once the holding time exceeds 6 hours, the crystals and precipitates in the alloy powder will be coarse, which will cause hot working materials. The mechanical properties are low. Based on this, the holding time is preferably 1 to 6 hours. After pressure sintering, forging processing is performed to obtain a finished structural member {steps 1-5, forging processing process}. [Examples] Hereinafter, the structural members of the known finished product obtained through the above steps, that is, the experiments of the characteristics and surface observation of aluminum alloys for plastic working will be described. First, the gas atomization method containing Elements with -11-200533763 (8)

Al2O3 aluminum alloy rapidly condenses and solidifies powder. The obtained aluminum alloy powder was formed into a small nine-body body having a diameter of 3 2 5 mm by cold equalizing forming. The obtained small nine body was maintained in a vacuum furnace at a temperature of 3 80 ° C for 1 hour, and a degassing treatment was performed, and then subjected to a high temperature of 5 60 ° C (No. 22 and ^^ 〇 in Table 1). It is 23 for 480) After sintering for 2 hours, the formed body is cooled to normal temperature, and then heated to 500 ° C by induction heating, extruded and pressed into a round rod, and subjected to water quenching treatment (T6), that is, 540 ° C. After holding for 2 hours, water cooling was applied to perform artificial aging treatment for 6 hours, and the results are shown in Table 2.

-12- 200533763 (9) Table 1

(Unit:% by weight) Ming alloy powder Al2O3 sintering temperature. c NO Si Mg Fe Mn Cr A1 average particle size μ m ai2o3 average particle size // m hair 1 2.0 0.4 0.3 0.6 0.6 residual 150 25 20 560 Ming 2 1.0 2.0 0.2 0.3 0.05 residual 80 15 10 560 in 3 0.4 1.5 0.1 0.05 0.3 residual 10 10 5 560 gold 4 0.8 1.0 0.15 0.05 0.3 residual 100 15 15 560 5 1.0 1.0 0.2 0.5 0.5 residual 80 30 10 560 6 1.0 1.0 0.2 0.5 0.5 residual 80 5 10 560 7 1.0 1.0 0.2 0.5 0.5 residual 80 20 25 560 8 1.0 1.0 0.2 0.5 0.5 residual 200 20 10 560 9 1.0 1.0 0.2 0.5 0.5 residual 5 20 10 560 10 0.2 1.5 0.2 0.5 0.5 residual 80 20 10 10 560 11 1.5 0.2 0.2 0.5 0.5 residual 80 20 10 560 contrast alloy 12 1.0 1.0 0.05 0.5 0.5 residual 80 20 10 560 13 1.0 1.0 0.2 0.04 0.5 residual 80 20 10 10 560 14 1.0 1.0 0.2 0.5 0.04 residual 80 20 10 560 15 2.5 1.0 0.2 0.5 0.5 residual 80 20 10 560 16 1.0 2.5 0.2 0.5 0.5 residual 80 20 10 560 17 1.0 1.0 0.4 0.5 0.5 residual 80 20 10 560 18 1.0 1.0 0.2 0.8 0.5 residual 80 20 10 560 19 1.0 1.0 0.2 0.5 0.8 residual 80 20 10 560 20 0.2 0.2 0.2 0.5 0.5 residual 80 20 10 560 21 2.5 2.5 0.2 0.5 0.5 residual 80 20 10 560 22 1.0 1.0 0.5 0.8 0.8 residual 80 20 10 480 23 1.0 2.0 0.2 0.3 0.3 Residual 80 10 10 480 • 13- 200533763 (10)

Table 2

NO Tensile strength (MPa) Elongation (%) Elastic coefficient (GPa) Whether there is a bubble invention ί = ι 36: 1 305 6.8 85 〇2 350 5.2 87 〇3 320 7.5 80 〇4 367 8.5 86.5 〇Compare alloy 5 340 1.8 88 〇6 335 5.2 75 to 86 〇7 350 3.4 82 〇8 330 2.5 79 〇9 290 to 340 3 to 5 74 to 82 〇10 280 4.2 82 〇11 250 4.6 78 〇12 290 4.0 82 〇13 305 4.8 82 〇14 320 4.7 8 1 〇15 335 2.8 84 〇16 340 3.2 80 〇17 3 10 3.5 80 〇18 325 2.8 83 〇19 330 3.6 83 〇20 240 4.5 75 〇2 1 350 2.2 82 〇22 280 3.9 76 〇23 290 4.8 75 X In the "Are there any bubbles" column, "0" means that there are no bubbles at all, and "X" means that bubbles are generated. When the particle size of alumina and aluminum alloy powder is small (No.6, No.9), the phenomenon of unevenness will increase, and the average characteristic will decrease. -14- 200533763 (11) According to the above experimental results, the tensile strength of the alloy (No. 1 to No. 4) of the present invention is 3 0 5 to 3 67 MPa, the elastic coefficient is 80 to 87 GPa, and the elongation is 5.2 to 8.5%. , Showing sufficient high tensile strength, modulus of elasticity and elongation. In addition, it is possible to suppress re-adsorption of the gas after degassing, and to obtain an aluminum alloy for plastic working without loss of processing such as generation of bubbles. On the other hand, the comparative alloy (Nο · 5 ~ No.23) was judged to have insufficient tensile strength φ, elastic coefficient, and elongation because the component amounts, average particle diameters, and sintering temperatures of aluminum alloy powder and A1203 were not appropriate. The uneven phenomenon greatly increased and bubbles were generated. Based on this, by: 0.4 to 2.0% by weight of Si, 0.4 to 2.0% by weight of Mg; and one or more selected from the group consisting of Fe, Mn, and Cr A total of 0.5 to 2.0% by weight, and the remainder of the aluminum alloy powder formed by A1 containing unavoidable impurities is dispersed by 10 to 25% by weight! The alumina can obtain a plastic φ aluminum alloy for processing at room temperature with an elastic coefficient of 80 GPa or more, a room temperature tensile strength of 300 MPa or more, and a ductility of 5% or more after water quenching. [Brief description of the drawings] Fig. 1: A flowchart showing the steps of a method for manufacturing an aluminum alloy for plastic working according to the present invention. -15-

Claims (1)

200533763 (1) X. Application for patent scope 1. An aluminum alloy for plastic processing, characterized by: 0.4 to 2.0% by weight of Si, 0.4 to 2.0% by weight of Mg; and containing from Fe, Mη, Cr is selected from the group consisting of more than 0.5 to 2.0% by weight of A1, and the remainder contains unavoidable impurities of A1, which is an aluminum alloy powder; and 10 to 25% by weight of alumina, a solidified molding material mixed at room temperature The elastic coefficient in the state is 80 GPa or more, the room-temperature tensile strength after water quenching is 300 MPa or more, and the ductility is 5% or more. 2 · The aluminum alloy for plastic working as described in item 1 of the patent application range, wherein the aluminum alloy powder is composed of 0.4 to 2.0% by weight of Si, 0 to 4 to 2 and 0% by weight of M. g, an alloy powder formed of 0. 10 to 0.3% by weight of Fe, 0.05 to 0.6% by weight of Mn, and 0.05 to 0.6% by weight of Cr A1. 3. The aluminum alloy for plastic working as described in item 1 or 2 of the scope of patent application, wherein the average particle diameter of the aluminum alloy powder is 10 to 15 μm, and the average particle diameter of the aluminum oxide is 5 to 20 μm. 4 · A method for manufacturing a sintered alloy for plastic working, which is composed of 0.4 to 2% by weight of Si and 0.4 to 2% by weight of Mg; and One or more Cr is selected from a total of 0.5 to 2.0% by weight, and the remaining portion contains aluminum alloy powder formed by A1 containing unavoidable impurities. 10 to 25% by weight of alumina is mixed with the mixed powder at room temperature. Press forming, vacuum degassing the formed body at 200 to 450 ° C, and press sintering the formed body sintered at a high temperature of 500 to 600 ° C, and then forging , And obtain the elastic coefficient at room temperature of -16-200533763 (2) 80GPa or more, the room temperature tensile strength after water quenching is 300 MPa or more, and the ductility is 5% or more, without bubbles Structural components. -17-