Lightweight high-strength cast aluminum-lithium alloy and preparation method thereof

A technology for casting aluminum and lithium alloys, which is applied in the field of metal materials and metallurgy, can solve problems such as poor casting performance, serious hot cracking tendency of castings, and anisotropy, so as to improve casting performance and mechanical properties, and reduce hydrogen absorption and oxidation , The effect of thinning effect is weakened
CN104451272BActive Publication Date: 2016-11-23SHANGHAI JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI JIAOTONG UNIV
Publication Date
2016-11-23

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Abstract

The invention discloses a light-weight and high-strength cast aluminum lithium alloy and a preparation method thereof. The alloy consists of Li, Cu, Mg, Zn, Zr, Ti, Mn, Ce and impurity elements in specific percentages by weight as well as the balance of Al. During preparation, an aluminum alloy is obtained by smelting Al-Li, Al-Cu, Al-Zr, Al-Ti-B, Al-Mn, Al-Ce intermediate alloy, pure aluminum, pure Zn and Pure Mg, and then is subjected to two-stage solid solution heat treatment of 400-450 DEG C / 8-10h and 510-540 DEG C / 20-28h, and one-stage aging treatment of (120-190) DEG C* (30-48) h is carried out after hardening treatment to obtain the light-weight and high-strength cast aluminum lithium alloy. The mechanical properties such as room temperature strength, hardness, rigidity and breaking tenacity of the prepared aluminum lithium alloy are superior to those of a traditional business aluminum alloy, and the aluminum lithium alloy is also low in cost.
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Description

technical field

[0001] The invention belongs to the field of metal materials and metallurgy; in particular, it relates to a light-weight high-strength cast aluminum-lithium alloy and a preparation method thereof. Background technique

[0002] Adding lithium to aluminum alloy can increase the elastic modulus of the alloy while reducing the density of the alloy. Studies have shown that adding 1wt% Li to aluminum alloy can reduce the density of the alloy by 3%, while the modulus of elasticity increases by 6%, and the alloy has a good hardening effect after solid solution and aging. Therefore, Al-Li alloy, as an aluminum alloy with low density, high elastic modulus, high specific strength and high specific stiffness, has shown broad application prospects in the aerospace field. Among many types of aluminum-lithium alloys, deformed aluminum-lithium alloys are widely used in aerospace and other fields due to their high strength and good plasticity. However, deformed aluminum-lith...

Claims

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