CN102828093A - Al-Cu-Sm rare earth cast aluminium alloy and preparation method thereof - Google Patents
Al-Cu-Sm rare earth cast aluminium alloy and preparation method thereof Download PDFInfo
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- CN102828093A CN102828093A CN2012102924895A CN201210292489A CN102828093A CN 102828093 A CN102828093 A CN 102828093A CN 2012102924895 A CN2012102924895 A CN 2012102924895A CN 201210292489 A CN201210292489 A CN 201210292489A CN 102828093 A CN102828093 A CN 102828093A
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Abstract
The invention discloses an Al-Cu-Sm rare earth cast aluminium alloy and a preparation method thereof. The weight percent of Cu in the Al-Cu-Sm alloy is 4.0-5.0%, the weight percent of Sm is 0.1-0.6%, and the balance is Al. During melting, Sm is added into aluminium alloy in a manner of Al-Sm intermediate alloy; the prepared aluminium alloy is treated by a solid solution at a temperature of 430-440 DEG C for a period of 8-10 hours, then is quenched in water at 60-100 DEG C. The technical effect of the invention is that: the addition of rare earth Sm into the aluminium alloy does not increase production cost, and the addition of rare earth Sm can significantly and effectively improve the morphology and distribution of a second phase, allow the closed reticularly-distributed second phase to become thinner or even be in completely discontinuous distribution, weaken the separation capability of the second phase to a matrix, and greatly improve the alloy strength and elongation percentage. The preparation method of the invention is simple in process, safe, reliable, and convenient for operation, and causes no three-waste pollution.
Description
Technical field
The present invention relates to a kind of aluminum silicon alloy, be specifically related to a kind of Al-Cu-Sm rare earth casting aluminium alloy and preparation method thereof.
Background technology
Duraluminum has HS, low density, high fracture toughness as typical light material in the metallic substance, and good characteristic such as high anti-stress-corrosion ability, is able to widespread use in machinery, chemical industry, automobile, building, Aeronautics and Astronautics field.Concerning aluminium alloy cast ingot, crystal grain thinning can make its interior tissue even, reduces segregation, improves plasticity and tensile strength, prevents defectives such as crackle and shrinkage cavity.
The ZL203 alloying constituent is Cu4.0 ~ 5.0%, and surplus is Al, though can pass through heat treatment reinforcement, obtains the good mechanical performance, and its castability is poor, and cavity filling ability is low, be prone to produce and loosen, and serious grain segregation is arranged among α-Al, and, hot cracking tendency is big.
REE has particular configurations of electronic shell and physicochemical property, and unique 4f electronic structure, big magnetic moment of atom, very strong spin coupling characteristic are arranged, and is also quite unique to the influence of duraluminum.
Increasing to the research of rare earth aluminium alloy both at home and abroad, but the influence to the microstructure and property of Al-Cu y alloy y does not also appear in the newspapers as a kind of alloy element for rare-earth Sm, therefore has bigger researching value.
Summary of the invention
The object of the present invention is to provide a kind of Al-Cu-Sm
Rare earth casting aluminium alloy and preparation method thereof, Sm joins in the Al-Cu alloy with appropriate vol, can effectively improve the microstructure of alloy, to improve the mechanical property of alloy.
Al-Cu-Sm rare earth casting aluminium alloy provided by the present invention is characterized in that: in the Al-Cu alloy, added the rare earth casting aluminium alloy weight percent and be 0.1 ~ 0.6% Sm, the weight percent of Cu is 4.0 ~ 5.0% in the described Al-Cu alloy, and surplus is Al.
Al-Cu-Sm rare earth casting aluminium alloy preparation method provided by the present invention is:
(1) the Al-Cu alloy is joined in the plumbago crucible, in resistance furnace, be heated to fusing after, add pure Al and Al-Sm master alloy.In 730 ~ 750 ℃ of TRs, above-mentioned alloy melt insulation was stirred 3 ~ 5 minutes after 25 ~ 35 minutes.Skim surface scum and cast rising to 755 ~ 765 ℃ after the alloy melt degasification refining after the stirring.
(2) with above-mentioned gained alloy at 510 ~ 530 ℃, the insulation 14 ~ 16h after at 80 ~ 100 ℃ of quenching-in waters.
Technique effect of the present invention is: in duraluminum, add rare-earth Sm and can not improve production cost; And the adding of rare-earth Sm ability significant effective is improved the form and the distribution of second phase; The second phase attenuation of feasible sealing net distribution; Even be discontinuously arranged fully, weaken the ability of isolating of the second relative matrix, thereby increased substantially alloy strength and unit elongation.Technology of the present invention is simple, safe and reliable, and is easy to operate, and three-waste free pollution.
Description of drawings
Fig. 1 is the microstructure of Al-5Cu (massfraction) alloy;
Fig. 2 is the microstructure of Al-4.5Cu-0.4Sm (massfraction) alloy.
Embodiment
The present invention will be described further through embodiment once.
Embodiment 1:
The composition of alloy (massfraction): 5.0%Cu, surplus is Al.
Press the mentioned component alloyage, its founding is: the Al-Cu alloy is joined in the plumbago crucible, in resistance furnace, be heated to fusing after, add pure Al.Above-mentioned alloy melt was stirred 4 minutes after 30 minutes 740 ℃ of insulations, skim surface scum and cast rising to 760 ℃ after the alloy melt degasification refining after the stirring.With above-mentioned gained alloy at 510 ℃, the insulation 14h after at 80 ℃ of quenching-in waters.
Embodiment 2:
The composition of alloy (massfraction): 4.0%Cu, 0.2%Sm, surplus is Al.
Press the mentioned component alloyage, its founding is: Al-50Cu (massfraction) alloy is joined in the plumbago crucible, in resistance furnace, be heated to fusing after, add pure Al and Al-Sm master alloy, wherein REE Sm accounts for 0.2% of alloy gross weight.Above-mentioned alloy melt was stirred 3 minutes after 25 minutes 730 ℃ of insulations.Skim surface scum and cast rising to 755 ℃ after the alloy melt degasification refining after the stirring.With above-mentioned gained alloy at 520 ℃, the insulation 15h after at 90 ℃ of quenching-in waters.
Embodiment 3:
The composition of alloy (massfraction): 4.5%Cu, 0.4%Sm, surplus is Al.
Press the mentioned component alloyage, its founding is: Al-50Cu (massfraction) alloy is joined in the plumbago crucible, in resistance furnace, be heated to fusing after, add pure Al and Al-Sm master alloy, wherein REE Sm accounts for 0.4% of alloy gross weight.Above-mentioned alloy melt was stirred 5 minutes after 35 minutes 750 ℃ of insulations.Skim surface scum and cast rising to 765 ℃ after the alloy melt degasification refining after the stirring.With above-mentioned gained alloy at 530 ℃, the insulation 16h after at 100 ℃ of quenching-in waters
Embodiment 4:
The composition of alloy (massfraction): 5.0%Cu, 0.6%Sm, surplus is Al.
Press the mentioned component alloyage, its founding is: Al-50Cu (massfraction) alloy is joined in the plumbago crucible, in resistance furnace, be heated to fusing after, add pure Al and Al-Sm master alloy, wherein REE Sm accounts for 0.6% of alloy gross weight.Above-mentioned alloy melt was stirred 4 minutes after 30 minutes 740 ℃ of insulations.Skim surface scum and cast rising to 760 ℃ after the alloy melt degasification refining after the stirring.With above-mentioned gained alloy at 820 ℃, the insulation 15h after at 80 ℃ of quenching-in waters.
The alloy cast ingot that obtains in above-mentioned four embodiments is processed into tension specimen by GB/T228-2002 metallic substance tensile test at room temperature method, and the mechanical property of the different embodiment samples of test is as shown in table 1 on tensile testing machine.
Can find out that from table 1 along with the increase of Sm content, the mechanical property of cast alloy significantly increases; When the content of Sm is increased to 0.4%; Tensile strength of alloys reaches 215MPa, and when more not adding Sm, alloy substrate has improved 10%; Unit elongation reaches 6.3% simultaneously, and the alloy substrate that does not more add Sm has improved 11%.
The as-cast condition alloy sampling down that embodiment 1 and embodiment 3 are made, through polishing, polishing, corrode after under opticmicroscope the observation alloy microscopic structure, shown in accompanying drawing 1 (embodiment 1) and accompanying drawing 2 (embodiment 3).From accompanying drawing, can find out; The adding ability significant effective of rare-earth Sm is improved the form and the distribution of second phase, the second phase attenuation of feasible sealing net distribution, even be discontinuously arranged fully; Weaken the ability of isolating of the second relative matrix, thereby increased substantially alloy strength and unit elongation.Technology of the present invention is simple, and is safe and reliable, easy to operate, and three-waste free pollution.
Table 1. Al-Cu alloy adds the mechanical property under the as-cast condition of Sm front and back
Claims (2)
1. Al-Cu-Sm rare earth casting aluminium alloy is characterized in that: in the Al-Cu alloy, added the rare earth casting aluminium alloy weight percent and be 0.1 ~ 0.6% Sm, the weight percent of Cu is 4.0 ~ 5.0% in the described Al-Cu alloy, and surplus is Al.
2. the preparation method of the described a kind of Al-Cu-Sm rare earth casting aluminium alloy of claim 1 is characterized in that:
(1) the Al-Cu alloy is joined in the plumbago crucible; After in resistance furnace, being heated to fusing; Add pure Al and Al-Sm master alloy; In 730 ~ 750 ℃ of TRs, the insulation of above-mentioned alloy melt was stirred 3 ~ 5 minutes after 25 ~ 35 minutes, skim surface scum and cast rising to 755 ~ 765 ℃ after the alloy melt degasification refining after the stirring;
(2) with above-mentioned gained alloy at 510 ~ 530 ℃, the insulation 14 ~ 16h after at 80 ~ 100 ℃ of quenching-in waters.
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| CN201210292489.5A CN102828093B (en) | 2012-08-17 | 2012-08-17 | Al-Cu-Sm rare earth cast aluminium alloy and preparation method thereof |
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| CN201210292489.5A CN102828093B (en) | 2012-08-17 | 2012-08-17 | Al-Cu-Sm rare earth cast aluminium alloy and preparation method thereof |
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| CN102828093A true CN102828093A (en) | 2012-12-19 |
| CN102828093B CN102828093B (en) | 2014-06-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5224908A (en) * | 1975-08-22 | 1977-02-24 | Showa Denko Kk | High strength aluminium alloy for casting |
| JPH01283335A (en) * | 1988-05-10 | 1989-11-14 | Showa Alum Corp | Aluminum alloy for vacuum |
| CN101532861A (en) * | 2009-04-17 | 2009-09-16 | 周岳建 | A method for manufacturing water meter housing by high strength cast aluminum alloy and a product thereof |
| CN102031423A (en) * | 2009-09-29 | 2011-04-27 | 贵州铝厂 | Cr-Sm high-strength heat resisting aluminum alloy material and preparation method thereof |
| CN102140602A (en) * | 2011-03-22 | 2011-08-03 | 南昌大学 | Al-Si-Cu-Mg-xSm rare-earth die-casting aluminum alloy |
-
2012
- 2012-08-17 CN CN201210292489.5A patent/CN102828093B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5224908A (en) * | 1975-08-22 | 1977-02-24 | Showa Denko Kk | High strength aluminium alloy for casting |
| JPH01283335A (en) * | 1988-05-10 | 1989-11-14 | Showa Alum Corp | Aluminum alloy for vacuum |
| CN101532861A (en) * | 2009-04-17 | 2009-09-16 | 周岳建 | A method for manufacturing water meter housing by high strength cast aluminum alloy and a product thereof |
| CN102031423A (en) * | 2009-09-29 | 2011-04-27 | 贵州铝厂 | Cr-Sm high-strength heat resisting aluminum alloy material and preparation method thereof |
| CN102140602A (en) * | 2011-03-22 | 2011-08-03 | 南昌大学 | Al-Si-Cu-Mg-xSm rare-earth die-casting aluminum alloy |
Non-Patent Citations (1)
| Title |
|---|
| 黄伯云等: "《中国材料工程大典第4卷有色金属材料工程（上）》", 31 January 2006 * |
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