Method for enhancing high strength cast aluminum alloys by large volume fraction of quasi-crystal

Abstract

This invention discloses a method for producing high-strength Al alloy reinforced with high-volume-percentage crystalloid. The method utilizes crystalloid alloy Al15-Mg44-Zn41 or Mg40-Zn60-Y10 as the reinforcing alloy, and cast Al102 or Al60-Mg40 alloy as the matrix. The method controls the pre-crystallization morphologies of the two alloys by liquid quenching. When the crystalloid melt temperature is reduced to 5-25 deg.C below its phase transition point, and the matrix temperature is 10-30 deg.C below crystalloid melt temperature, high-volume-percentage crystalloid is introduced into the matrix melt. During the co-melting process, the temperature difference ensures precipitated crystalloid is not re-molten, thus can realize reinforcement of high-volume-percentage crystalloid micro- or nano-particles to Al alloy matrix. During the re-melting process, the crystalloid particles are not molten. The method is a-effect reinforcement method.

Description

(1) Technical field [0001] The invention relates to the strengthening and preparation technology of high-strength cast aluminum alloys in the field of material research, and is a method for strengthening high-strength cast aluminum alloys with a large volume fraction of quasicrystals. (2) Background technology [0002] In the past ten years, the research on high-strength aluminum alloys can basically be divided into two categories. [0003] The first category is mainly research on strengthening theory and strengthening technology under conventional solidification conditions. This kind of research involves the most extensive scope, and many achievements have been applied in production. Its main means of strengthening include: alloying, heat treatment and microstructure refinement. In the alloying and heat treatment of high-strength aluminum alloys, a large number of researchers have done very systematic and meticulous research work. Most of them are based on the alloy syst...

AI Technical Summary

Problems solved by technology

[0006] (1) The potential of traditional aluminum alloy strengthening technology is very limited, and it is impossible to achieve greater breakthroughs, especially under the conditions of large-scale industrial production

[0007] (2) The strengthening technology under unconventional solidification conditions, especially the rapid solidification technology, can make the performance index of aluminum alloy reach a very attractive level, but due to the limitation of the heat transfer process, the scale of the material that can be prepared is very limited. Only some low-dimensional materials can be prepared, such as thin films, filaments or powders, and it is impossible to manufacture large and medium-sized load-bearing structures

Other methods such as powder metallurgy have strict process requirements and high production costs, making it difficult to produce on a large scale