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Low-density and high-rigidity cast aluminum-lithium alloy and method for preparing same

A high-rigidity, aluminum-casting technology, applied in the field of metal materials and metallurgy, can solve the problems of low density and high rigidity of aluminum-lithium alloy, harmful to human body, only 0.4%, etc., to improve the actual yield, improve quality, reduce The effect of oxidative burn loss

Active Publication Date: 2016-06-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Han Jiande of Shandong University and others studied the changes in the structure and properties of Al-Li-Cu ternary casting alloys by changing the content of Li and Cu. In the aging state, the mechanical properties of the alloy reached 350Mpa, but the elongation was only 0.4%; Russian scientists (Effect of alloying elements on the structure and properties of Al-Li-Cucastalloys, Russian Metallurgy, 2009, 4, 338-344) studied the influence of alloying elements on the properties of cast aluminum-lithium alloys, and developed a kind of Al-3Li-1.5Cu ternary alloys added Cast aluminum-lithium alloys with better properties can be obtained by using different trace elements, but the added elements Cd and Be are harmful to the human body
Chinese patent document CN201410674805.4 discloses a light-weight high-strength cast aluminum-lithium alloy and its preparation method. This alloy has high mechanical properties at room temperature and contains 2-3wt% Li and 1.5-2.5wt% Cu. Maximize the advantages of low density and high stiffness of Al-Li alloy

Method used

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  • Low-density and high-rigidity cast aluminum-lithium alloy and method for preparing same
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  • Low-density and high-rigidity cast aluminum-lithium alloy and method for preparing same

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Experimental program
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Effect test

Embodiment 1

[0033] First preheat pure aluminum, pure magnesium and intermediate alloys Al-Cu, Al-Zr, Al-Mn to 180°C-200°C, then put pure aluminum into a graphite crucible to melt. After the aluminum ingot is melted, add the Al-Cu master alloy at 750-760°C. After the temperature of the aluminum liquid rises to 750-760°C, directly add the Al-Mn master alloy into the aluminum liquid and keep it warm for 5 minutes. After the heat preservation is over, add the Al-Zr master alloy at 760°C, stir evenly after it melts and sprinkle the covering agent (LiF:LiCl=1:3) on the surface of the melt. Under the protection of argon, use a bell jar to press pure Li into the melt, add Mg and Ag immediately after complete melting, stir evenly after adding, scrape off the surface slag and sprinkle the covering agent. After reducing the melt temperature to around 740°C, the C 2 Cl 6 The refining agent refines the melt twice. After refining, the slag is removed and the covering agent is sprinkled. The temperatu...

Embodiment 2

[0041] First preheat pure aluminum, pure magnesium and intermediate alloys Al-Cu, Al-Zr, Al-Mn to 180°C-200°C, then put pure aluminum into a graphite crucible to melt. After the aluminum ingot is melted, add the Al-Cu master alloy at 750-760°C. After the temperature of the aluminum liquid rises to 750-760°C, directly add the Al-Mn master alloy into the aluminum liquid and keep it warm for 5 minutes. After the heat preservation is over, add the Al-Zr master alloy at 760°C, stir evenly after it melts and sprinkle the covering agent (LiF:LiCl=1:3) on the surface of the melt. Under the protection of argon, use a bell jar to press pure Li into the melt, add Mg and Ag immediately after complete melting, stir evenly after adding, scrape off the surface slag and sprinkle the covering agent. After reducing the melt temperature to around 740°C, the C 2 Cl 6 The refining agent refines the melt twice. After refining, the slag is removed and the covering agent is sprinkled. The temperatu...

Embodiment 3

[0049] First preheat pure aluminum, pure magnesium and intermediate alloys Al-Cu, Al-Zr, Al-Mn to 180°C-200°C, then put pure aluminum into a graphite crucible to melt. After the aluminum ingot is melted, add the Al-Cu master alloy at 750-760°C. After the temperature of the aluminum liquid rises to 750-760°C, directly add the Al-Mn master alloy into the aluminum liquid and keep it warm for 5 minutes. After the heat preservation is over, add the Al-Zr master alloy at 760°C, stir evenly after it melts and sprinkle the covering agent (LiF:LiCl=1:3) on the surface of the melt. Under the protection of argon, use a bell jar to press pure Li into the melt, add Mg and Ag immediately after complete melting, stir evenly after adding, scrape off the surface slag and sprinkle the covering agent. After reducing the melt temperature to around 740°C, the C 2 Cl 6 The refining agent refines the melt twice. After refining, the slag is removed and the covering agent is sprinkled. The temperatu...

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Abstract

The invention discloses low-density and high-rigidity aluminum-lithium alloy and a method for preparing the same. The low-density and high-rigidity cast aluminum-lithium alloy comprises, by weight, 3-3.5% of Li, 1-2% of Cu, 0.5-2% of Mg, 0.4-0.8% of Ag, 0.14-0.2% of Zr, 0.3-0.8% of Mn, lower than 0.25% of impurity elements Si, Fe, Na and K and the balance Al. The low-density and high-rigidity cast aluminum-lithium alloy and the method have the advantages that alloy elements (the Li, the Cu, the Mg, the Ag, the Zr and the Mn) are added by the aid of the method, solid solution and aging treatment is carried out by the aid of the method, and accordingly the low-density and high-rigidity cast aluminum-lithium alloy with excellent mechanical properties can be obtained and is high in elastic modulus and low in density as compared with the traditional cast aluminum alloy; the low-density and high-rigidity cast aluminum-lithium alloy is high in Li element yield and low in cost.

Description

technical field [0001] The invention belongs to the field of metal materials and metallurgy, and relates to a low-density, high-rigidity cast aluminum-lithium alloy and a preparation method thereof, in particular to a method of adding alloy elements (Li, Cu, Mg, Ag, Zr, Mn) and related Heat treatment process conditions obtain a method for preparing cast aluminum-lithium alloys with excellent mechanical properties, and the prepared aluminum alloys have better room temperature strength and stiffness than traditional cast aluminum alloys. Background technique [0002] Lithium is the lightest metal element in nature, its density is only 0.534g / cm 3 , adding 1wt% Li to the aluminum alloy can reduce the density of the alloy by 3%, increase the modulus of elasticity by 6%, and the alloy has the effect of aging strengthening. Therefore, aluminum-lithium alloys are representative of high-strength, high-elastic-modulus, ultra-light aluminum alloy materials, and show broad application...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/03C22F1/04
CPCC22C1/026C22C1/03C22C21/00C22F1/04
Inventor 陈安涛孙建锋张亮彭雨吴国华汪存龙李艳磊
Owner SHANGHAI JIAO TONG UNIV
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