C-modified Li-Nb-RE high-strength heat-resisting aluminum alloy material and preparation method thereof

Abstract

The invention discloses a C-modified Li-Nb-RE high-strength heat-resisting aluminum alloy material, which comprises the following components in percentage by weight: 1.0 to 10.0 percent of Cu, 0.05 to 1.5 percent of Mn, 0.01 to 0.5 percent of Cd, 0.01 to 0.5 percent of Ti, 0.0001 to 0.15 percent of C, 0.01 to 1.0 percent of Zr, 0.1 to 3.0 percent of Li, 0.01 to 1.0 percent of Nb, 0.05 to 5 percent of RE (rare earth element), and the balance of Al. A high-quality melt, solid solution and a phase diagraph theory are taken as guidance, a C element serves as a high-efficiency modifier and a preferable formula of principal alloy elements, namely Cu, Mn and RE is adopted, so that the quasi solid-phase temperature range of the alloy is narrowed and problems such as high heat cracking tendency during casting, low strength of a product at high temperature and the like are solved; and a preferable formula of low-cost multiple microalloying elements is adopted, so the high-strength high-resisting aluminum alloy material is developed finally.

Description

technical field [0001] The invention relates to an aluminum alloy material and a preparation method thereof, in particular to a Li-Nb-RE high-strength heat-resistant aluminum alloy material modified by C and a preparation method thereof. Background technique [0002] Aluminum alloy is a relatively young metal material, which only began to be used industrially in the early 20th century. During World War II, aluminum was mainly used in the manufacture of military aircraft. After the war, due to the sharp decrease in the demand for aluminum in the military industry, the aluminum industry began to develop civilian aluminum alloys, expanding its application scope from the aviation industry to the construction industry, container packaging industry, transportation industry, electric power and electronics industry, Various sectors of the national economy such as machinery manufacturing and petrochemicals are applied to people's daily lives. At present, aluminum is used in a large...

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Problems solved by technology

[0033] The technical problem to be solved by the present invention is to solve the existing problems in the field of high-strength aluminum alloys, such as extensive melt treatment process, poor quality, large thermal cracking tendency, poor casting performance, low product yield, low high-temperature strength, waste materials and slag recycling. For technical problems such as poor usability, guided by high-quality melt, solid solution and phase diagram theory, using C element as a high-efficiency modifier, by optimizing the alloy main element Cu, Mn and rare earth element formula, reducing the quasi-solid phase temperature range of the alloy, and solving the problem of casting The general problem of high thermal cracking tendency and low high-temperature strength of products (including instantaneous strength and durable strength); the low-cost multi-element microalloying element formula is preferred for the cultivation and fine-graining of high-temperature phases and strengthening phases in solid solutions Create material basic conditions; and optimize smelting and heat treatment technology to realize sufficient cultivation of high-temperature phase and strengthening phase in solid solution and full play of fine-graining effect

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