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A scandium-containing cast aluminum-lithium alloy and a preparation method thereof

A technology for casting aluminum and lithium alloys, which is applied in the preparation of scandium-containing cast aluminum-lithium alloys and the preparation of cast aluminum-lithium alloys, can solve the problems of lack of research on cast aluminum-lithium alloys, low strength and elongation, and shoulder-to-shoulder strength. Effects of inhibiting grain growth and coarsening, reducing oxidation inclusions, and improving strength levels

Inactive Publication Date: 2018-09-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There is a lack of research on casting aluminum-lithium alloys at home and abroad. In response to the urgent needs of reducing weight and improving rigidity of complex structural parts in the aerospace and military fields (such as missile cabins and torpedo shells, etc.), the development of mechanical properties and excellent casting properties , a new cast aluminum-lithium alloy with lower cost is imperative
The strength and elongation of the currently developed cast aluminum-lithium alloys are low, and it is difficult to match the strength of traditional cast high-strength aluminum alloys (ZL201, ZL205A)

Method used

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  • A scandium-containing cast aluminum-lithium alloy and a preparation method thereof
  • A scandium-containing cast aluminum-lithium alloy and a preparation method thereof
  • A scandium-containing cast aluminum-lithium alloy and a preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] Preheat pure aluminum, pure magnesium and intermediate alloys Al-Cu, Al-Zr, Al-Sc to 180-225°C, then put pure aluminum into a graphite crucible to melt. After the aluminum ingot is melted, add the Al-Sc intermediate alloy at 760-770°C, stir evenly after it melts, add the Al-Cu intermediate alloy at 740-760°C, and after the temperature of the aluminum liquid rises to 750°C, add the Al-Zr Add the master alloy directly into the molten aluminum, stir evenly after melting and sprinkle the covering agent (LiF:LiCl=1:3~1:2) on the surface of the melt, and keep it warm for 15 minutes. Under the protection of argon, add Mg under the condition of 730-740°C, stir it fully after it melts, scrape off the surface slag and sprinkle it with covering agent; then press pure Li into the melt with a bell jar, keep argon flowing, After it is completely melted, stir evenly, scrape off the slag on the surface and sprinkle it with covering agent. After lowering the temperature of the melt to ...

Embodiment 2

[0052] First preheat pure aluminum, pure magnesium and intermediate alloys Al-Cu, Al-Zr, Al-Sc to 180°C-225°C, then put pure aluminum into a graphite crucible to melt. After the aluminum ingot is melted, add the Al-Sc intermediate alloy at 760-770°C, stir evenly after it melts, add the Al-Cu intermediate alloy at 740-760°C, and after the temperature of the aluminum liquid rises to 750°C, add the Al-Zr Add the master alloy directly into the molten aluminum, stir evenly after melting and sprinkle the covering agent (LiF:LiCl=1:3~1:2) on the surface of the melt, and keep it warm for 15 minutes. Under the protection of argon, add Mg under the condition of 730-740°C, stir it fully after it melts, scrape off the surface slag and sprinkle it with covering agent; then press pure Li into the melt with a bell jar, keep argon flowing, After it is completely melted, stir evenly, scrape off the slag on the surface and sprinkle it with covering agent. After lowering the temperature of the ...

Embodiment 3

[0062]Preheat pure aluminum, pure magnesium and intermediate alloys Al-Cu, Al-Zr, Al-Sc to 180-225°C, then put pure aluminum into a graphite crucible to melt. After the aluminum ingot is melted, add the Al-Sc intermediate alloy at 760-770°C, stir evenly after it melts, add the Al-Cu intermediate alloy at 740-760°C, and after the temperature of the aluminum liquid rises to 750°C, add the Al-Zr Add the master alloy directly into the molten aluminum, stir evenly after it melts and sprinkle the covering agent (LiF:LiCl=1:2) on the surface of the melt, and keep it warm for 15 minutes. Under the protection of argon, add Mg under the condition of 730-740°C, stir it fully after it melts, scrape off the surface slag and sprinkle it with covering agent; then press pure Li into the melt with a bell jar, keep argon flowing, After it is completely melted, stir evenly, scrape off the slag on the surface and sprinkle it with covering agent. After lowering the temperature of the melt to abou...

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Abstract

A novel scandium-containing cast aluminum-lithium alloy is disclosed. The alloy includes, by weight, 1.6-1.99% of Li, 0.9-1.9% of Cu, 0.2-0.7% of Mg, 0.1-0.25% of Zr, 0.05-0.35% of Sc, and impurity elements which are Fe, Si, Na, K and P, with the balance being Al, with the Fe content being less than 0.15% and the total content of the impurity elements being less than 0.25%. During preparation, Al-Cu and Al-Zr master alloys, pure aluminum, pure Mg and pure Li are smelted to obtain an aluminum alloy; then three stages of solid solution heat treatment are performed including solid solution heat treatment at 440-460 DEG C for 32 h, solid solution heat treatment at 510-520 DEG C for 24-32 h and solid solution heat treatment at 530-540 DEG C for 1-6 h; and after water quenching, artificial ageing treatment at 150-190 DEG C is performed for 16-48 h to obtain the novel scandium-containing cast aluminum-lithium alloy. The obtained novel scandium-containing cast aluminum-lithium alloy has a uniform microscopic structure, stable performance, density lower than density of traditional aluminum alloys, higher elastic modulus and rigidity, and other mechanical properties, and is low in cost. Theultimate tensile strength of the novel scandium-containing cast aluminum-lithium alloy can be 450-490 MPa and the specific elongation is 4.5-7.0%.

Description

technical field [0001] The invention belongs to the field of metal materials and metallurgy, and relates to a preparation method of cast aluminum-lithium alloy containing scandium, in particular to a method obtained by adding alloy elements (Li, Cu, Mg, Sc, Zr) and corresponding heat treatment process conditions A method for preparing a cast aluminum-lithium alloy with low density, high elastic modulus, and high strength and toughness. Background technique [0002] The rapid development of the aerospace field has put forward increasingly stringent requirements for aircraft, especially large civil aircraft manufacturing. Reducing the density of materials and improving the stiffness and damage tolerance of materials has become an important means to achieve breakthroughs in core technologies. Aluminum-lithium alloy is a lightweight alloy with low density, high strength, high stiffness and damage resistance. Studies have shown that for every 1wt% Li added to aluminum alloy, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/16C22C1/03C22C1/06C22F1/04C22F1/057
CPCC22C1/026C22C1/03C22C1/06C22C21/00C22C21/16C22F1/04C22F1/057
Inventor 张小龙张亮吴国华刘文才史春昌孙江伟张晋硕
Owner SHANGHAI JIAO TONG UNIV
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