摘要
采用Gleeble-1500D热模拟试验机进行高温等温压缩变形试验,研究了B95оч铝合金在变形温度为330～450℃、应变速率为0.001～1.000 s-1条件下的热变形行为,并利用金相显微镜(OM)和透射电子显微电镜(TEM)分析了B95оч铝合金在不同变形条件下的组织特征。研究结果表明:变形温度和应变速率对B95оч铝合金的流变应力大小有着显著的影响,合金的流变应力随变形温度的升高而降低,随应变速率的增加而增大。B95оч铝合金在450℃以下热变形过程中析出大量的第二相粒子,并随着温度的降低数量显著增加。B95оч铝合金热变形后平均亚晶尺寸随Zener-Hollomon参数的升高而减小,即随着变形温度的降低、应变速率的升高而减小。B95оч铝合金热变形的流变应力行为可以用包含Arrhenius项的Zener-Hollomon参数来描述,其变形激活能为124.09 kJ·mol-1。
The behavior of B95оч aluminum alloy during hot deformation was studied by isothermal compression in the temperature range from 330 to 450 ℃ and strain rate from 0.001 to 1.000 s-1 on Gleeble-1500D thermal mechanical simulator.And the OM and TEM were employed to analyze the microstructure of B95оч aluminum alloy treated by different deformation processes.The results showed that the flow stress was significantly influenced by both deformation temperatures and strain rates.The flow stress decreased with the increase of the deformation temperatures,and increased with the increase of the strain rates.During the deformation period at the temperature below 450 ℃,there appeared a large number of second phase particles in the B95оч aluminum alloy,and the amount of them increased significantly with the decrease of the deformation temperature.The average subgrain size decreased with the increase of Zener-Hollomon parameter,and it decreased with the increase of strain rate and the decrease of deformation temperature.The flow stress of the B95оч aluminum alloy during hot compression deformation could be described by using Zener-Hollomon parameter including Arrhenius item,and the deformation activation energy was 124.09 kJ · mol-1.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2012年第5期687-693,共7页
Chinese Journal of Rare Metals
基金
国际科技合作项目(2010DFB50340)
国家重点基础研究发展计划课题(2012CB619504)
国家自然科学基金项目(50904010)
