Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 3    March 2016

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Mechanical behavior of Al-Zn-Mg-Cu alloy under tension in semi-solid state
Gang CHEN1, Yu-min ZHANG2, Zhi-ming DU1

1. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China;
2. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China

Abstract:In order to study the hot fractures in relation to the semi-solid processing, the tensile tests of an extruded 7075 aluminum alloy which is based on Al-Zn-Mg-Cu system were carried out in the high temperature solid and semi-solid states at different strain rates. The results show that the tensile behavior can be divided into three regimes with increasing the liquid fraction. The alloy first behaves in a ductile character, and as the temperature increases, the fracture mechanism changes from ductile to brittle which is determined by both of liquid and solid, and lastly the fracture mechanism is brittle which is totally dominated by liquid. At strain rates of 1×10-4, 1×10-3 and 1×10-2 s-1, the brittle temperature ranges are 515-526, 519-550 and 540-580 °C, respectively. Two equations which are critical for tensile behavior are proposed.

 

Key words: Al-Zn-Mg-Cu alloy; mechanical behavior; semi-solid processing; fracture

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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