Hot deformation behavior of spray formed Al-22Si-5Fe-3Cu-1Mg alloy
来源期刊：中国有色金属学报(英文版)2011年第z2期
论文作者：JIA Yan-dong CAO Fu-yang NING Zhi-liang SUN Xiao-bing SUN Jian-fei
文章页码：299 - 303
Key words：spray forming; Al-Si alloy; hot deformation behavior; constitutive equation
Abstract: The hot deformation behavior of a spray formed Al-22Si-5Fe-3Cu-1Mg alloy was investigated by isothermal compression tests at temperature ranging from 350 °C to 500 °C and strain rate from 0.001 s-1 to 0.1 s-1. At the beginning of deformation, work hardening is the major factor. The flow stress quickly reaches a peak, followed by a continuous reduction, then a balance is established between the tendency to work harden and the tendency to flow soften. The stress curves appear almost in flat shape. A constitutive equation in the hyperbolic sine function for describing the deformation behavior was established and the hot deformation activation energy was determined to be 312.65 kJ/mol. It can be concluded that the temperature of extrusion should not be more than 500 °C in order to avoid primary silicon coarsen.
JIA Yan-dong, CAO Fu-yang, NING Zhi-liang, SUN Xiao-bing, SUN Jian-fei
(School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract:The hot deformation behavior of a spray formed Al-22Si-5Fe-3Cu-1Mg alloy was investigated by isothermal compression tests at temperature ranging from 350 °C to 500 °C and strain rate from 0.001 s-1 to 0.1 s-1. At the beginning of deformation, work hardening is the major factor. The flow stress quickly reaches a peak, followed by a continuous reduction, then a balance is established between the tendency to work harden and the tendency to flow soften. The stress curves appear almost in flat shape. A constitutive equation in the hyperbolic sine function for describing the deformation behavior was established and the hot deformation activation energy was determined to be 312.65 kJ/mol. It can be concluded that the temperature of extrusion should not be more than 500 °C in order to avoid primary silicon coarsen.
Key words:spray forming; Al-Si alloy; hot deformation behavior; constitutive equation
