摘要
在不同变形温度(275~350℃)和应变速率(5~25s^(-1))下,采用单道次大变形量(80%)轧制ZK60镁合金,研究了变形温度和应变速率对合金显微组织和拉伸性能的影响。结果表明:随着变形温度的升高和应变速率的增大,合金的再结晶体积分数增加;当变形温度不高于300℃时,随着应变速率的增大,再结晶晶粒尺寸先减小后增大,抗拉强度先增后降,伸长率增大;而当温度高于300℃时,再结晶晶粒尺寸先增大后减小再增大,抗拉强度先降低后增大再降低,伸长率增大;在温度300℃,应变速率10s^(-1)下轧制后,所得ZK60镁合金板的拉伸性能最好,抗拉强度和伸长率分别为358 MPa,21.5%。
ZK60 magnesium alloy was rolled at different deformation temperatures（275-350 ℃）and different strain rates（5-25 s^-1）by a single pass rolling process with a large reduction of 80%.The effects of deformation temperature and strain rate on microstructure and tensile properties of the alloy were studied.The results show that the recrystallization volume fraction of the alloy increased with the increase of deformation temperature and stain rate.When the deformation temperature was not higher than 300 ℃,the recrystallization grain size decreased and then increased,the tensile strength increased and then decreased,and the elongation increased with the increase of strain rate.When the temperature was higher than 300 ℃,the recrystallization grain size increased and then decreased and then increased,the tensile strength decreased and then increased and then decreased,and the elongation increased with the increase of stain rate.After being rolled at 300℃ and strain rate of 10 s^-1,the as-rolled ZK60 magnesium alloy sheet had a relatively optimal comprehensive tensile property with the tensile strength of 358 MPa and the elongation of 21.5%.
作者
黄彪
严红革
陈吉华
夏伟军
苏斌
程美信
HUANG Biao;YAN Hongge;CHEN Jihua;XIA Weijun;SU Bin;CHENG Meixin(Hunan Provincial Key Laboratory of Spray Deposition Technology ＆ Application, School of Materials Science and Engineering, Hunan University, Changsha 410082, China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第6期69-73,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51471066)
关键词
ZK60镁合金
高应变速率轧制
动态再结晶
显微组织
拉伸性能
ZK60 magnesium alloy
high strain rate rolling
dynamic recrystallization
microstructure
tensile property
