CN108779516A - Zn-Al alloy and preparation method thereof with directionality crystal grain - Google Patents

Zn-Al alloy and preparation method thereof with directionality crystal grain Download PDF

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Publication number
CN108779516A
CN108779516A CN201780009499.4A CN201780009499A CN108779516A CN 108779516 A CN108779516 A CN 108779516A CN 201780009499 A CN201780009499 A CN 201780009499A CN 108779516 A CN108779516 A CN 108779516A
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CN
China
Prior art keywords
alloy
crystal grain
zinc
unidirectional solidification
aluminium
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Pending
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CN201780009499.4A
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Chinese (zh)
Inventor
韩承传
丁海昌
安志爀
李在炫
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Industry Academy Cooperation Foundation of Changwon National University
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Industry Academy Cooperation Foundation of Changwon National University
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Publication of CN108779516A publication Critical patent/CN108779516A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/02Making non-ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C18/00Alloys based on zinc
    • C22C18/04Alloys based on zinc with aluminium as the next major constituent

Abstract

Zinc-aluminium according to the present invention is characterised by comprising following steps and prepares:Zinc-aluminium master alloy is obtained by forging type;And the above-mentioned zinc of remelting-aluminium master alloy with the unidirectional growth speed of 1~500 μm/second, makes zinc-aluminium master alloy carry out unidirectional solidification in 450~700 DEG C of melt so that tissue by have it is directive in a manner of grow, thus the average aspect ratio of crystal grain is 3~12.According to the present invention, it is based on unidirectional solidification or continuously casting, crystal grain and precipitate have directionality, and the mechanical property of hardness, tensile strength, elongation percentage etc is improved.The addition of copper keeps this effect more prominent.It is improved with flexible especially because being difficult to the tensile strength improved simultaneously with reciprocal characteristic, is just of great importance from this point on together.

Description

Zn-Al alloy and preparation method thereof with directionality crystal grain
Technical field
The present invention relates to a kind of Zn-Al alloys and preparation method thereof, more particularly to according to unidirectional solidification or continuously casting side Formula have directionality crystal grain zinc-allumen with and preparation method thereof.
Background technology
Zn-Al alloy as with low price, low melting point die casting alloy, be mainly used as electronic industry, transport service, The small-scale structures material such as construction industry.But since compared with other structural materials, intensity is relatively low, and it is broken to be easy to happen brittleness It is bad, thus purposes can only be limited.
Therefore, tool intensity and flexible (machinability) for improving Zn-Al alloy are particularly important, but due to metal material Mechanical strength and flexibility have reciprocal characteristic, thus it is very difficult to improve mechanical strength and flexibility simultaneously.
For the reasons why being identical with this, by the methods of alloy design, process modification, while the machine of Zn-Al alloy is improved Tool intensity and multinomial research flexible are in progress, and its necessity is also in demand.
In the past due to preparing Zn-Al alloy by common die casting (die casting) method, without departing from upper State boundary.For this zinc-aluminium die casting alloy, in Korean granted patent the 10-0961081st It is disclosed in (2010.06.08. bulletins).
Existing technical literature
Korean granted patent the 10-0961081st (2010.06.08. bulletins).
Invention content
Technical problem
Therefore, the problem to be solved in the present invention is, provide makes crystal grain have side by unidirectional solidification or continuously casting Tropism, the Zn-Al alloy and preparation method thereof that thus mechanical property of hardness, tensile strength, flexibility or the like is improved.
Solution to problem
For realizing the Zn-Al alloy of the present invention of the above problem, which is characterized in that have directionality crystal grain.
Preferably, the average aspect ratio of above-mentioned crystal grain is 3~12.
Preferably, Zn-Al alloy of the invention includes the copper of the aluminium of 3~5wt%, 2~5wt% relative to total weight.
The allumen of the present invention has following feature, 60~150Hv of hardness, 40~400MPa of tensile strength, elongation percentage 5 ~45%.
The Zn-Al alloy of the present invention is characterized in that above-mentioned directionality crystal grain is according to unidirectional solidification or continuously casting mode It obtains.
Preferably, it in 450~700 DEG C of melt, is carried out with the unidirectional growth speed of 1~500 μm/second above-mentioned unidirectional solidifying Gu.
According to above-mentioned unidirectional solidification, Zn-Al alloy of the invention is frozen into after rod shape, can be added and is processed into plate Material, wire rod or bar.
Zn-Al alloy preparation method for realizing the present invention of the above problem is characterised by comprising:By casting side Formula obtains zinc-aluminium master alloy;And the above-mentioned zinc of remelting-aluminium master alloy, in 450~700 DEG C of melt, with 1~500 μm/second Unidirectional growth speed carry out unidirectional solidification so that tissue by have it is directive in a manner of grow, wherein the Mean aspect of crystal grain Than being 3~12.
Preferably, above-mentioned melt is placed under inert gas atmosphere.
The effect of invention
According to the present invention, according to unidirectional solidification or continuously casting, crystal grain and precipitate have directionality, thus hardness, anti- The mechanical property of tensile strength, elongation percentage etc is improved.The addition of copper keeps this effect more prominent.
It is carried together with flexible especially because being difficult to the tensile strength improved simultaneously with reciprocal characteristic Height is just of great importance from this point on.
Moreover, the feelings of the various forms such as plank, wire rod or bar are processed into conventional cast Zn-Al alloy Condition is compared, and when having the Zn-Al alloy of directionality crystal grain according to the additional processing of the present invention, tensile strength and elongation percentage are obtained into one Step improves.
Description of the drawings
Fig. 1 is the attached drawing of the Unidirectional solidification device 1 of the unidirectional solidification for illustrating to be used in the present invention.
Fig. 2 is the microstructure photo of the Zn-Al alloy prepared by conventional cast.
Fig. 3 is the microstructure photo of the unidirectional solidification Zn-Al alloy of the present invention.
The rod shape Zn-Al alloy of mechanical property chart when Fig. 4 is to(for) additional processing unidirectional solidification.
The explanation of reference numeral
1:Unidirectional solidification device 10:Stove
20:Alumina tube 30:Aluminium oxide pipeline
40:Heater 50:Cooling end
51:Cooling water 60:Supporting rod
80:Gas injection unit 90:Upper and lower transfer device
Specific implementation mode
Hereinafter, next by referring to accompanying drawing, the preferred embodiments of the present invention are described in detail.Embodiment below is to understand Present disclosure and it is disclosed, those skilled in the art can carry out a variety of in the technological thought of the present invention Deformation.Therefore the interest field of the present invention is not interpreted as being defined in this embodiment.
The preparation of Zn-Al alloy 100 with directionality crystal grain
1. conventional cast
After carrying out weighing to Zn-Al alloy 1 to 7 by composition, using high frequency induction melting furnace, 3kg is respectively cast.This Afterwards, the bar of length 100mm, diameter 4.7mm are processed by ingot bar.Show that the ingredient of Zn-Al alloy 1 to 7 contains in following table 1 Amount.
Table 1
2. unidirectional solidification
As shown in Figure 1, in Unidirectional solidification device 1, side that stove 10 can be to move up and down according to upper and lower transfer device 90 Formula is arranged.The middle section of stove 10 is provided with aluminium oxide pipeline 30, and the outer periphery of aluminium oxide pipeline 30 is provided with hair Hot body 40, to be heated to aluminium oxide pipeline 30.The lower part of aluminium oxide pipeline 30 is provided with what cooling water 51 flowed through Cooling end 50.
Alumina tube 20 is inserted into aluminium oxide pipeline 30.The outer diameter of alumina tube 20 is 8mm, internal diameter 5mm, and length is 700mm, and lower end is blocked.The upper end of alumina tube 20 is provided with gas injection unit 80 so that the inside of alumina tube 20 It is able to maintain that the inert gas atmosphere of argon (Ar) or the like.The bottom of alumina tube 20 is provided with 60 (su of supporting rod pport rod)。
Unidirectional solidification process as described below.
First, the bottom end for sealing aluminium oxide 20 will be as described above after the bottom of alumina tube 20 is packed into supporting rod 60 The bar (zinc-aluminium master alloy) prepared by conventional cast is encased in alumina tube 20.
Then, after alumina tube 20 being fixed on gas injection unit 80, alumina tube fixed in this way 20 is made to be encased in In aluminium oxide pipeline 30 inside stove 10.
Then, alumina tube 20 is heated by heater 40, keeps bar (zinc-aluminium master alloy) remelting molten to be formed After liquid 70, in the state of 20 remains stationary of alumina tube, stove 10 is set unidirectionally to be moved along top by upper and lower transfer device 90 It is dynamic.So in the process, unidirectional solidification Zn-Al alloy 100 is obtained according to unidirectional solidification.
At this time, it is preferable that form inert gas atmosphere inside alumina tube 20, to prevent the oxidation of melt 70, preferably Ground carries out unidirectional solidification, so that the average aspect ratio of crystal grain in 450~700 DEG C of melts 70 with the speed of 1~500 μm/second It is 3~12 or so.
In initial position, after unidirectional solidification zinc-aluminium conjunction 100 is grown into 60mm, rod shape is obtained by water cooling.
The measurement of the mechanical property of unidirectional solidification Zn-Al alloy 100
Following table 2 shows the unidirectional solidification Zn-Al alloy of Zn-Al alloy and the present invention for being prepared by conventional cast 100 Determination of Hardness result.Determination of Hardness carries out under conditions of the load of 100gf and 10 seconds load application times.
Table 2
Following table 3 shows the unidirectional solidification Zn-Al alloy of Zn-Al alloy and the present invention for being prepared by conventional cast 100 tensile strength measurement result.
Table 3
Following table 4 shows the unidirectional solidification Zn-Al alloy of Zn-Al alloy and the present invention for being prepared by conventional cast 100 elongation percentage measurement result.Item of the tensile properties evaluation of tensile strength and elongation percentage etc in the tensile speed of 2mm/min It is carried out under part.
Table 4
When observing above-mentioned table 2 to table 4, it can be seen that compared with conventional cast, after unidirectional solidification, hardness, tension are strong Degree, elongation percentage are improved.As previously described, because tensile strength and flexibility have reciprocal characteristic, therefore, it is difficult to same Shi Tigao, but the present invention can obtain while improve tensile strength and effect flexible, just be of great importance from this point on.
When observing table 3 to table 4, it can be seen that compared with alloy 1, alloy 3 has good tensile strength and elongation percentage, It can be considered as when copper is added to Zn-Al alloy, be precipitated by Zn-Cu in the crystal boundary (grain boundary) of zinc-aluminium base The particulate ε phases that solid solution is constituted, thus tensile strength and elongation percentage characteristic are improved.
The microstructure of unidirectional solidification Zn-Al alloy 100
Fig. 2 is the microstructure photo of the Zn-Al alloy prepared by conventional cast, and Fig. 3 is the unidirectional solidification of the present invention The microstructure photo of Zn-Al alloy 100.
Following table 5 has arranged the average crystal grain aspect ratio based on these determining images.The size of analysis image is vertical at this time To 1150 μm, laterally 850 μm.
Table 5
From, as can be seen that after unidirectional solidification, grain aspect ratio is at least 3.65, this is than conventional cast in above-mentioned table 5 Situation is big.
Since unidirectional solidification is a kind of method continuously making material solidification, when hot-fluid proceeds to solid phase from liquid phase When, tissue having solidified, having organized has directionality.As described in the invention, when unidirectional solidification, the crystal grain of alloy Sub (grain) and precipitate, are so improved along unidirectional array, tensile strength and elongation percentage characteristic.
Continuously casting is set to have organized directionality, it is unidirectional solidifying since its principle is actually identical as unidirectional solidification Gu and continuously casting can be considered as identical train of thought.
The addition processing and forming of unidirectional solidification Zn-Al alloy 100
As described above, the rod shape Zn-Al alloy 100 of unidirectional solidification is processed by additional, line can be reprocessed into The variforms such as material, plank, bar.
Following table 6 is to measure the stick for drawing (drawing) conventional cast and unidirectional solidification with 30%, 50%, 80% The result table of mechanical property when the alloy 3 of shape, Fig. 4 are the charts being illustrated to it.
Table 6
As can be seen that the case where carrying out additional molding to unidirectional solidification Zn-Al alloy 100 from Fig. 4 and Fig. 6, and to general When the case where logical casting Zn-Al alloy carries out additional molding is compared, the increase rate of tensile strength and elongation percentage is more prominent.
According to the present invention, according to unidirectional solidification or continuously casting, crystal grain and precipitate have directionality, thus hardness, The mechanical property of tensile strength, elongation percentage etc is improved.The addition of copper keeps this effect more prominent.
It is carried together with flexible especially because being difficult to the tensile strength improved simultaneously with reciprocal characteristic Height is just of great importance from this point on.
Moreover, the feelings of the various forms such as plank, wire rod or bar are processed into conventional cast Zn-Al alloy Condition is compared, and when having the Zn-Al alloy of directionality crystal grain according to the additional processing of the present invention, tensile strength and elongation percentage are obtained into one Step improves.

Claims (10)

1. a kind of Zn-Al alloy, which is characterized in that have directionality crystal grain.
2. Zn-Al alloy according to claim 1, which is characterized in that the average aspect ratio of the crystal grain is 3~12.
3. Zn-Al alloy according to claim 1, which is characterized in that for total weight, including the aluminium of 3~5wt%, 2~ The copper of 5wt%.
4. Zn-Al alloy according to claim 1, which is characterized in that hardness be 60~150Hv, tensile strength be 240~ 400MPa。
5. Zn-Al alloy according to claim 1, which is characterized in that elongation percentage is 5~45%.
6. Zn-Al alloy according to claim 1, which is characterized in that the directionality crystal grain is according to unidirectional solidification or company Continuous forging type obtains.
7. Zn-Al alloy according to claim 6, which is characterized in that in 450~700 DEG C of melt, with 1~500 μ M/ seconds unidirectional growth speed carries out the unidirectional solidification.
8. Zn-Al alloy according to claim 6, which is characterized in that according to above-mentioned unidirectional solidification, be frozen into rod shape it Afterwards, plank, wire rod or bar are processed into.
9. a kind of Zn-Al alloy preparation method, which is characterized in that including:
Zinc-aluminium master alloy is obtained by forging type;And
The above-mentioned zinc of remelting-aluminium master alloy, with the unidirectional growth speed of 1~500 μm/second, makes in 450~700 DEG C of melt Zinc-aluminium master alloy carries out unidirectional solidification so that tissue by have it is directive in a manner of grow,
The average aspect ratio of the crystal grain of the zinc of acquisition-aluminium master alloy is 3~12.
10. a kind of Zn-Al alloy preparation method according to claim 9, which is characterized in that the melt is placed in indifferent gas Under body atmosphere.
CN201780009499.4A 2017-02-28 2017-03-21 Zn-Al alloy and preparation method thereof with directionality crystal grain Pending CN108779516A (en)

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KR1020170025824A KR101910868B1 (en) 2017-02-28 2017-02-28 Zinc-Aluminium alloy having directional grain and method for fabricating the same
KR10-2017-0025824 2017-02-28
PCT/KR2017/003019 WO2018159890A1 (en) 2017-02-28 2017-03-21 Grain-oriented zinc-aluminum alloy and manufacturing method therefor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111536796B (en) * 2020-06-15 2021-09-14 贵州省鑫泰增材制造有限公司 Smelting equipment for zinc alloy and production process thereof

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JPH01294837A (en) * 1988-05-21 1989-11-28 Toho Aen Kk High strength zinc alloy
US4990310A (en) * 1989-09-11 1991-02-05 General Motors Corporation Creep-resistant die cast zinc alloys
GR3021536T3 (en) * 1993-01-14 1997-02-28 Union Miniere France Sa METHOD FOR PRODUCING Zn-Al-Cu ALLOY ARTICLES BY CENTRIFUGAL OR DIE CASTING.
JPH1161300A (en) * 1997-08-25 1999-03-05 Mitsui Mining & Smelting Co Ltd Zinc-base alloy for metal mold, zinc-base alloy block for metal mold, and their manufacture
JPH11279673A (en) * 1998-03-30 1999-10-12 Mitsui Mining & Smelting Co Ltd Zinc alloy for metal mold, metal mold and block for metal mold
US20110014084A1 (en) * 2009-07-20 2011-01-20 Eastern Alloys, Inc. High strength, creep resistant zinc alloy
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US4990310A (en) * 1989-09-11 1991-02-05 General Motors Corporation Creep-resistant die cast zinc alloys
GR3021536T3 (en) * 1993-01-14 1997-02-28 Union Miniere France Sa METHOD FOR PRODUCING Zn-Al-Cu ALLOY ARTICLES BY CENTRIFUGAL OR DIE CASTING.
JPH1161300A (en) * 1997-08-25 1999-03-05 Mitsui Mining & Smelting Co Ltd Zinc-base alloy for metal mold, zinc-base alloy block for metal mold, and their manufacture
JPH11279673A (en) * 1998-03-30 1999-10-12 Mitsui Mining & Smelting Co Ltd Zinc alloy for metal mold, metal mold and block for metal mold
US20110014084A1 (en) * 2009-07-20 2011-01-20 Eastern Alloys, Inc. High strength, creep resistant zinc alloy
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CN104498773A (en) * 2014-12-19 2015-04-08 宁波博威合金材料股份有限公司 Deformed zinc-based alloy material as well as preparation method and application thereof

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Application publication date: 20181109