Nb-W-RE high-strength heat-resistant aluminum alloy material taking C for modification and preparation method thereof

Abstract

The invention discloses an Nb-W-RE high-strength heat-resistant aluminum alloy material taking C for modification. The alloy comprises the following components in percentage by weight: 1.0-10.0 Cu, 0.05-1.5 Mn, 0.01-0.5 Cd, 0.01-0.5 Ti, 0.0001-0.15 C, 0.01-1.0 Zr, 0.01-1.0 Nb, 0.01-1.0 W, 0.05-5 rare-earth element RE and the balance of Al. The method takes high-quality melt, a solid solution and a phase diagram theory as guidance, takes the C element as a high-effect modification agent, preferably selects a prescription of main elements Cu, Mn and RE, reduces the quasi solid-phase temperaturerange of the alloy, and solves the problems of large tendency of hot cracking, low intensity of high temperature of products and the like during casting. By preferably selecting a prescription of low-cost multiple micro alloying elements, the method finally develops the high-strength heat-resistant aluminum alloy material.

Description

Technical field [0001] The invention relates to an aluminum alloy material and a preparation method thereof, in particular to a Nb-W-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 started industrial application in the early 20th century. During the Second World War, aluminum was mainly used to manufacture military aircraft. After the war, due to the sudden drop in the military industry’s demand for aluminum, the aluminum industry began to develop civilian aluminum alloys, and its application range was expanded from the aviation industry to the construction industry, container and packaging industry, transportation, power and electronics industry, Various sectors of the national economy, such as machinery manufacturing and petrochemical industries, are applied to people's daily lives. At present, aluminum is used in a large amount...

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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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