摘要
采用等温压缩试验法 ,测定了新型Al- 10Sn - 4Si合金高温变形过程的真应力—真应变曲线 ;在温度为 10 0～ 40 0℃范围和应变速率为 0 0 0 1～ 1 0s 1范围的变形条件下 ,研究了该合金的流变应力变化规律 .结果表明 ,Al- 10Sn - 4Si合金为正应变速率敏感材料 ,表现出稳态流变特征 :稳态流变阶段 ,流变应力基本保持不变 ;稳态流变应力随变形速率的增加而增大 ,随变形温度的升高而降低 .进一步分析表明 ,这种稳态流变特征与动态回复、动态再结晶及局部晶界粘滞性流动行为有关 ,受热激活过程控制 .通过回归分析 。
True stress-strain curves of plastic deformation for new Al-10Sn-4Si alloy have been tested by the isothermal compression process at high temperatures with Gleeble 1?500 machine,The flow stress of the compression process for the alloy has been investigated in the temperature range of 100～400 ℃ and the strain rate range of 1 0～0 001 s 1 .The results show that the plastic deformation process of the alloy have steady state flow characteristics and the flow stress is sensitive to strain rate.The flow stress hardly vareis in the period of steady state flow.The steady stress increased with increasing the strain rate and decreasing the temperature.The flow stress characteristics was closely related to dynamic recovery and re-crystallization and sticky flow of local grain boundary.The plastic flow was a thermally activated process ,which is governed by rate-controlling mechanism of dislocation.The steady flow stress equations were established by regression analysis.
出处
《广东工业大学学报》
CAS
2000年第2期1-5,23,共6页
Journal of Guangdong University of Technology
基金
省重点学科基金项目 !(96 930 2 )
广东工业大学博士基金项目! (9930 0 6 )
关键词
铝锡硅合金
等温压缩
塑性变形
流变应力
Al-10Sn-4Si alloy
isothermal compression
plastic deformation
flow stress
