Super-high strength and high hardness TiB2 particle reinforced Al-Zn-Mg-Cu composite material and preparation method thereof

Abstract

The invention discloses a super-high strength and high hardness TiB2 particle reinforced Al-Zn-Mg-Cu composite material and a preparation method thereof, and belongs to the field of composite materials. Al-Zn-Mg-Cu alloy serves as a matrix, TiB2 with the mass fraction being 3%-10% and with the average size smaller than 1 micron serves as reinforcing particles, and the Al-Zn-Mg-Cu alloy matrix comprises, by mass, 8%-10% of Zn, 1.0%-2.0% of Mg, 1.0%-1.5% of Cu, 0.05%-0.20% of Zr, and the balance Al. Al-TiB2 intermediate alloy is prepared through a melt self-propagating direct synthetic method, proportioning and smelting are carried out according to the design ingredients of the composite material, the Al-TiB2 intermediate alloy serves as a matrix, an Al ingot, a Zn ingot, a Mg ingot, Al-Cu intermediate alloy and Al-Zr intermediate alloy are added, standing is carried out after stirring, and casting is carried out. The TiB2 particles are uniform in distribution and small in dimension, and both the strength and hardness are remarkably improved compared with those of the matrix alloy.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to a component design and preparation method of composite materials. Background technique [0002] Al-Zn-Mg-Cu series aluminum alloy is a kind of 7xxx series aluminum alloy, also known as ultra-high strength aluminum alloy. Based on its low density, high specific strength and hardness, easy processing and forming, good corrosion resistance and high toughness, it is an important lightweight structural material in the aerospace and military industries. Modern aircraft and lightweight tanks are developing towards higher speed, more load, and higher trafficability, and the service life and driving safety are becoming more and more important, which requires the materials used to have higher strength and better fatigue resistance Excellent comprehensive properties such as performance and wear resistance. [0003] Since the birth of the 7075 alloy in 1943, the Al-Zn-Mg-Cu aluminum allo...

AI Technical Summary

Problems solved by technology

However, due to the high Zn / Mg, the stress corrosion cracking of the alloy is serious, and the Zn content of the alloy is difficult to further increase after increasing to 11%.

The addition of endogenous particles can significantly improve the strength and hardness of the alloy. The synthesis system is mainly based on stirring addition and in-situ synthesis. At present, the high-zinc ultra-high-strength Al-Zn-Mg-Cu alloy is used as the matrix to prepare composite materials. There are few studies on materials, and SiC with large particle size and insufficient bonding with the matrix interface is used as reinforcing particles. The reinforcing particles prepared in situ are directly carried out in the ultra-high strength aluminum alloy solution, which will inevitably affect the The main component elements cause a certain loss

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