摘要
通过拉伸试验、显微组织观察等手段,研究了初始应变速率和变形温度对低温等径角挤压(ECAP)制备的1050铝合金拉伸性能及晶粒大小的影响。结果表明,随初始应变速率的增加,流动应力不断增加;随着变形温度的升高,流动应力不断减小。当初始应变速率为5×10^(-4)s^(-1)、变形温度为400℃时,合金具有最大的伸长率90.4%。当变形温度为400℃,初始应变速率大于或小于5×10^(-4)s^(-1)时,合金的伸长率均逐渐降低。当初始应变速率为5×10^(-4)s^(-1),变形温度大于或小于400℃时,合金的伸长率均逐渐降低。随初始应变速率的降低和变形温度的增加,合金的晶粒尺寸增大明显。
The tensile properties and grain size of 1050 aluminum alloy prepared by cryo- genic equal channel angular pressing （cryoECAP） are investigated at different initial strain rates and deformation temperatures by means of tensile tests and microstructure observation. The results show that the flow stress increases with the initial strain rate going up. The flow stress decreases with the the deformation temperature rising up. The greatest elongation of 90.4% is obtained when the alloy is tensile tested at an initial strain rate of 5 × 10 ^-4s ^-1 at 400℃. When deformed at 400℃, the elongation decreases gradually with the initial strain rate increasing or decreasing from 5 × 10^-4s^-1. When deformed with an initial strain rate of 5 × 10^-4s^-1 ,the elongation decreases gradually with the deformation temperature increasing or decreasing from 400℃. The grain size of 1050 aluminum alloy increases obviously with strain rate decreasing and deformation temperature increasing . Key words： 1050 aluminum alloy; cryoECAP; high temperature tensile properties; flow stress ; elongation
出处
《轻合金加工技术》
CAS
北大核心
2016年第8期44-48,共5页
Light Alloy Fabrication Technology
基金
国家重点基础研究发展计划项目(2012CB723307)
