Coarsening of equiaxed microstructure in the semisolid state of aluminum 7075 alloy through SIMA processing

被引：61

作者：

Bolouri, Amir ^{[1
]}

Shahmiri, Mohammad ^{[2
]}

Kang, Chung Gil ^{[3
]}

机构：

[1] Pusan Natl Univ, Grad Sch Mech & Precis Engn, Pusan 609735, South Korea

[2] Iran Univ Sci & Technol, Dept Mat & Met Engn, Tehran 1684613114, Iran

[3] Pusan Natl Univ, Sch Mech Engn, Pusan 609735, South Korea

来源：

JOURNAL OF MATERIALS SCIENCE | 2012年 / 47卷 / 08期

基金：

新加坡国家研究基金会;

关键词：

HIGH-VOLUME FRACTION; MECHANICAL-PROPERTIES; HEAT-TREATMENT; EVOLUTION; BEHAVIOR; 7075-ALUMINUM-ALLOY; PHASE;

D O I：

10.1007/s10853-011-6200-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present study, the coarsening mechanism of equiaxed grains in the semisolid state of aluminum 7075 alloy, treated via strain induced melting activation process, was investigated. The kinetics of equiaxed grain growth in the semisolid state of the experimental alloy was determined. The results revealed that when the holding temperature increased, the coarsening rate constant (K) showed a precipitously increasing character in the range of 590-610 A degrees C. This was attributed to the extensive effect of the coalescence mechanism on the grain growth at the high solid fractions. By further increasing the holding temperature to 620 and 625 A degrees C (increasing the liquid fraction), the effect of coalescence on the grain growth appeared to be weakened, that is, although there was a slight decrease at 620 A degrees C, a gently increasing character could be generally supposed. Severe segregation of Zn and Cu alloying elements at grain boundaries and intragranular droplets was detected at 620 and 625 A degrees C after 15 and 10 min, respectively.

引用

页码：3544 / 3553

页数：10

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