CN108034873A - A kind of Al-6%Cu alloys of low hot cracking tendency and preparation method thereof - Google Patents
A kind of Al-6%Cu alloys of low hot cracking tendency and preparation method thereof Download PDFInfo
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- CN108034873A CN108034873A CN201711157362.1A CN201711157362A CN108034873A CN 108034873 A CN108034873 A CN 108034873A CN 201711157362 A CN201711157362 A CN 201711157362A CN 108034873 A CN108034873 A CN 108034873A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides a kind of Al 6%Cu alloys of low hot cracking tendency, wherein each alloy compositions and its percentage by weight are：Cu contents are 6.2% 6.7%, and Mg contents are 0.4% 0.9%, and Cr contents are 0.1% 0.25%, and Ga contents are 0.07% 0.22%, surplus Al.Micro Ga elements are added in Al 6%Cu alloys by the present invention, so as to significantly drop low-alloyed hot cracking tendency, improve the comprehensive mechanical performance of alloy, the tensile strength of alloy, elongation are obviously improved under as cast condition, after Overheating Treatment, the tensile strength of novel alloy, elongation can be lifted further, and tensile strength can reach more than 800MPa, and elongation can reach 12.5 13.5%.At the same time, it is contemplated that application cost, addition Ga amount of element is smaller, and cost is relatively inexpensive, which has extensive prospect in actual industrial production.
Description
Technical field
The present invention relates to metal alloy compositions preparation field, it is related to the Al-6%Cu alloys and its system of a kind of low hot cracking tendency
Preparation Method.
Background technology
Al-Cu systems alloy has the characteristics that intensity height, good toughness, processing performance are superior always, but because its hot cracking tendency
The shortcomings that big, restricts its application always.Fire check is in alloy graining process, is shunk in semi-solid range and is obstructed and results from
A kind of defect of crystal boundary.Since made of Al-Cu alloy is based solid solution alloys, it causes its group in solidification and crystallization wider range
It is extremely flourishing to knit dendrite, eutectic composition is less, while alloy is solidifying latter stage poor fluidity, prevents the crackle of generation from abundant
By liquid phase feeding, cause Al-Cu systems alloy hot cracking tendency larger.
The content of the invention
Present invention aims at by lifting Cu constituent contents and removing Zr elements, so as to reduce Al-Cu systems alloys heat
Tendency is split, while lifts the comprehensive mechanical performance of alloy.
A kind of Al-6%Cu alloys of low hot cracking tendency, wherein each alloy compositions and its percentage by weight are：Each alloy compositions
And its percentage by weight is：Cu contents are 6.2%-6.7%, and Mg contents are 0.4%-0.9%, and Cr contents are 0.1%-0.25%, and Ga contains
Measure as 0.07%-0.22%, surplus Al.
Preferably, the percentage by weight of the Ga is 0.15%-0.25%.
Preferably, in the Al-6%Cu alloys, the content of Zr elements is less than 0.01%.
A kind of preparation method of the Al-6%Cu alloys of low hot cracking tendency, comprises the following steps：
A, crucible is heated in 740-760 DEG C of smelting furnace, adds high-purity Al and Al-Cr intermediate alloys；
B, after alloy all melts, furnace temperature is dropped to 710-730 DEG C, adds Al-Cu and Al-Ga intermediate alloys；
C, after alloy all melts, furnace temperature is dropped to 695-705 DEG C, adds pure magnesium；
D, after alloy all melts, 1-2min is gently mixed, is sufficiently mixed aluminium alloy；
E, after by degasification, refining, scarfing cinder, it is poured into sand mold or mould.
When alloy is poured into the metal die of cut off diameter method survey alloy hot cracking tendency, mould is preheated to 250-
350℃。
The advantages and positive effects of the present invention are：
Micro Ga elements are added in Al-6%Cu alloys by the present invention, so as to significantly drop low-alloyed hot cracking tendency, are improved
The comprehensive mechanical performance of alloy, the tensile strength of alloy, elongation are obviously improved under as cast condition, after Overheating Treatment,
The tensile strength of novel alloy, elongation can be lifted further, and tensile strength can reach more than 800MPa, and elongation can reach
12.5-13.5%.At the same time, it is contemplated that application cost, addition Ga amount of element is smaller, and cost is relatively inexpensive, and the alloy is in actual work
There is extensive prospect in industry production.
Embodiment
Embodiment 1
A kind of Al-6%Cu alloys of low hot cracking tendency, wherein each alloy compositions and its percentage by weight are：Each alloy compositions and its
Percentage by weight is：Cu contents are that 6.5%, Mg contents are that 0.45%, Cr contents are that 0.18%, Ga contents are 0.17%, surplus Al.
The content of the Zr elements is 0.002%.
A kind of preparation method of the Al-6%Cu alloys of low hot cracking tendency, comprises the following steps：
A, crucible is heated in 755 DEG C of smelting furnace, adds high-purity Al and Al-Cr intermediate alloys；
B, after alloy all melts, furnace temperature is dropped to 725 DEG C, adds Al-Cu and Al-Ga intermediate alloys；
C, after alloy all melts, furnace temperature is dropped to 700 DEG C, adds pure magnesium；
D, after alloy all melts, 1.5min is gently mixed, is sufficiently mixed aluminium alloy；
E, after by degasification, refining, scarfing cinder, it is poured into sand mold or mould.
When alloy is poured into the metal die of cut off diameter method survey alloy hot cracking tendency, mould is preheated to 320 DEG C.
Embodiment 2
A kind of Al-6%Cu alloys of low hot cracking tendency, wherein each alloy compositions and its percentage by weight are：Each alloy compositions and its
Percentage by weight is：Cu contents are that 6.7%, Mg contents are that 0.4%, Cr contents are that 0.25%, Ga contents are 0.15%, surplus Al.
The content of the Zr elements is 0.005%.
A kind of preparation method of the Al-6%Cu alloys of low hot cracking tendency, comprises the following steps：
A, crucible is heated in 760 DEG C of smelting furnace, adds high-purity Al and Al-Cr intermediate alloys；
B, after alloy all melts, furnace temperature is dropped to 710 DEG C, adds Al-Cu and Al-Ga intermediate alloys；
C, after alloy all melts, furnace temperature is dropped to 705 DEG C, adds pure magnesium；
D, after alloy all melts, 1min is gently mixed, is sufficiently mixed aluminium alloy；
E, after by degasification, refining, scarfing cinder, it is poured into sand mold or mould.
When alloy is poured into the metal die of cut off diameter method survey alloy hot cracking tendency, mould is preheated to 250-
350℃。
Embodiment 3
A kind of Al-6%Cu alloys of low hot cracking tendency, wherein each alloy compositions and its percentage by weight are：Each alloy compositions and its
Percentage by weight is：Cu contents are that 6.2%, Mg contents are that 0.9%, Cr contents are that 0.1%, Ga contents are 0.25%, surplus Al.
The content of the Zr elements is 0.004%.
A kind of preparation method of the Al-6%Cu alloys of low hot cracking tendency, comprises the following steps：
A, crucible is heated in 740 DEG C of smelting furnace, adds high-purity Al and Al-Cr intermediate alloys；
B, after alloy all melts, furnace temperature is dropped to 730 DEG C, adds Al-Cu and Al-Ga intermediate alloys；
C, after alloy all melts, furnace temperature is dropped to 695 DEG C, adds pure magnesium；
D, after alloy all melts, 2min is gently mixed, is sufficiently mixed aluminium alloy；
E, after by degasification, refining, scarfing cinder, it is poured into sand mold or mould.
When alloy is poured into the metal die of cut off diameter method survey alloy hot cracking tendency, mould is preheated to 250 DEG C.
Comparative example 1
The content of Zr elements in embodiment 1 is promoted to 0.018%, remaining proportioning is constant.
After testing, the tensile strength of the sample of 1-3 of the embodiment of the present invention is respectively 817 MPa, 815 MPa and 808MPa,
Elongation is respectively 13.8%, 12.9% and 13.4%；The tensile strength of the sample of comparative example 1 is 588MPa, and elongation is respectively
11.2%。
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of Al-6%Cu alloys of low hot cracking tendency, it is characterised in that each alloy compositions and its percentage by weight are：Cu contains
It is 0.4%-0.9% to measure as 6.2%-6.7%, Mg contents, and Cr contents are 0.1%-0.25%, and Ga contents are 0.07%-0.22%, and surplus is
Al。
2. the Al-6%Cu alloys of low hot cracking tendency as claimed in claim 1, it is characterised in that the weight percent of the Ga
Than for 0.15%-0.25%.
3. the Al-6%Cu alloys of low hot cracking tendency as claimed in claim 1, it is characterised in that the Al-6%Cu alloys
In, the content of Zr elements is less than 0.01%.
4. a kind of preparation method of the Al-6%Cu alloys of low hot cracking tendency, it is characterised in that comprise the following steps：
A, crucible is heated in 740-760 DEG C of smelting furnace, adds high-purity Al and Al-Cr intermediate alloys；
B, after alloy all melts, furnace temperature is dropped to 710-730 DEG C, adds Al-Cu and Al-Ga intermediate alloys；
C, after alloy all melts, furnace temperature is dropped to 695-705 DEG C, adds pure magnesium；
D, after alloy all melts, 1-2min is gently mixed, is sufficiently mixed aluminium alloy；
E, after by degasification, refining, scarfing cinder, it is poured into sand mold or mould.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711157362.1A CN108034873A (en) | 2017-11-20 | 2017-11-20 | A kind of Al-6%Cu alloys of low hot cracking tendency and preparation method thereof |
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| CN201711157362.1A CN108034873A (en) | 2017-11-20 | 2017-11-20 | A kind of Al-6%Cu alloys of low hot cracking tendency and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497948A (en) * | 2009-03-18 | 2009-08-05 | 哈尔滨工业大学 | Preparation of low hot cracking tendency Al-5% Cu based alloy |
| CN101654745A (en) * | 2009-09-24 | 2010-02-24 | 哈尔滨工业大学 | Preparation method of Al-5 percent Cu base alloy with low heat cracking tendency |
| CN106244874A (en) * | 2016-08-27 | 2016-12-21 | 来安县科来兴实业有限责任公司 | A kind of special heat-resisting aluminium alloy of EMU gear case body and preparation method thereof |
| CN106702293A (en) * | 2017-02-28 | 2017-05-24 | 内蒙古蒙东高新科技城有限公司 | Heat treatment process of high-strength wear-resistant Al-Si-Cu alloy |
| CN106929721A (en) * | 2017-03-29 | 2017-07-07 | 沈阳工业大学 | A kind of high intensity Al Cu alloys of low hot cracking tendency and preparation method thereof |
-
2017
- 2017-11-20 CN CN201711157362.1A patent/CN108034873A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497948A (en) * | 2009-03-18 | 2009-08-05 | 哈尔滨工业大学 | Preparation of low hot cracking tendency Al-5% Cu based alloy |
| CN101654745A (en) * | 2009-09-24 | 2010-02-24 | 哈尔滨工业大学 | Preparation method of Al-5 percent Cu base alloy with low heat cracking tendency |
| CN106244874A (en) * | 2016-08-27 | 2016-12-21 | 来安县科来兴实业有限责任公司 | A kind of special heat-resisting aluminium alloy of EMU gear case body and preparation method thereof |
| CN106702293A (en) * | 2017-02-28 | 2017-05-24 | 内蒙古蒙东高新科技城有限公司 | Heat treatment process of high-strength wear-resistant Al-Si-Cu alloy |
| CN106929721A (en) * | 2017-03-29 | 2017-07-07 | 沈阳工业大学 | A kind of high intensity Al Cu alloys of low hot cracking tendency and preparation method thereof |
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