High modulus, ultrahigh strength TiB2 particle reinforced Al-Zn-Mg-CU composite material and preparation method thereof

Abstract

The invention discloses a high modulus, ultrahigh strength TiB2 particle reinforced Al-Zn-Mg-CU composite material and a preparation method thereof and belongs to the field of composite materials. TiB2 with a high zinc Al-Zn-Mg-CU-Zr alloy serving as a matrix, the mass fraction being 6.0%-10.0% and the average size being smaller than 1 [mu]m serves as a reinforcement particle; an Al-TiB2 intermediate alloy is prepared through a melt self-propagating direct synthesis method, dosing and melting are conducted according to composite material design compositions, the Al-TiB2 intermediate alloy serves as a matrix, pure aluminum ingots, pure zinc ingots, pure magnesium ingots and an Al-Cu and Al-Zr intermediate alloy are added, stirring and standing are conducted, and then casting is conducted; after homogenization treatment at the temperature of 420-470 DEG C for 25-45 h, casting ingots are squeezed at the temperature of 330-430 DEG C with the squeezing ratio being (15-20):1; and a squeezed material is subjected to T6 artificial aging treatment, the strength of the matrix alloy is significantly improved, and compared with the matrix alloy, the elastic modulus of the composite material is improved by 45%.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to composition design and preparation process optimization of a composite material. 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-C...

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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