Be-Li-RE high-strength heat-resistant aluminum alloy material and preparation method thereof

Abstract

The invention discloses a high-strength heat-resistant aluminum alloy material and a preparation method thereof. The high-strength heat-resistant aluminum alloy material comprises the following components in percentage by weight: 1.0-10.0% of Cu, 0.05-1.5% of Mn, 0.01-0.5% of Cd, 0.01-0.5% of Ti, 0.01-0.2% of B, 0.01-1.0% of Zr, 0.001-0.1% of Be, 0.01-3.0% of Li, 0.05-5% of RE and the balance of Al. With high-quality melt, sosoloid and the phase diagram theory as the guidance, the invention reduces the quasi solid-phase temperature range of the alloy and solves the problems of great thermal cracking tendency during casting, low high-temperature strength of products and the like by preferably selecting the formation of main alloy elements of Cu, Mn and RE. The preferable selection of the formulation of low-cost multielement microalloy elements creates material base conditions for breeding and grain-refining a high-temperature phase and a strengthening phase in the sosoloid, and a high-strength heat-resistant aluminum alloy material is finally developed.

Description

technical field [0001] The invention relates to an aluminum alloy material and a preparation method thereof, in particular to an aluminum alloy material containing microalloying elements and rare earth elements 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 ...

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Problems solved by technology

[0025] 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, under the guidance of high-quality melt, solid solution and phase diagram theory, by optimizing the formula of main alloy elements Cu, Mn and rare earth elements, the temperature range of the quasi-solid phase of the alloy is reduced, and the hot cracking tendency during casting and the high temperature of the product are solved. The general problem of low strength (including instantaneous strength and durable strength); optimize the low-cost multi-element microalloying element formula to create material basic conditions for the cultivation and fine-graining of high-temperature phases and strengthening phases in solid solutions; and optimize Melting and casting, heat treatment technology and equipment (mainly including refining, degassing, impurity removal, rare earth compound element degassing, impurity removal, high-efficiency compound modification treatment, crystallization control, special heat treatment, etc.), to achieve sufficient high-temperature phase and strengthening phase in solid solution The full play of mass cultivation and fine crystallization

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