摘要
研究了镁合金ZK40经等通道挤压1道次和4道次后的超塑性和微观组织.在523 K进行的拉伸实验表明,随着挤压道次的增加,ZK40的延伸率也得到了提高.实验通过对ZK40作不同条件下的拉伸测试,得到了超塑性表现最好的温度和应变速率.经4道次等通道挤压后的ZK40在523 K的温度和1×10-4/s的应变速率下其断裂延伸率达到了660%.微观组织的分析表明,ZK40在等通道处理过程中,晶粒随着挤压道次的增加不断细化,而且晶粒的等轴性和均匀性得到显著改善.
The superplasticity and mierostructure of magnesium alloy ZK40 processed by ECAP for 1 and 4 passes were investigated. Tensile experiments at 523 K show that the elongation of ZK40 is improved with increasing passes. The temperature and strain rate at which showed the significant superplasticity were obtained by the tensile tests at various experimental conditions. The elongation-to-failure of ZK40 processed by ECAP for 4 passes at 523 K and strain rate of 1 ×10^-4/s is 660%. The microstructural analyses reveals that with the increase of passes, the grain size of ZK40 is apparently refined, and the axial equality and uniformity of grains get significantly improved.
出处
《沈阳工业大学学报》
EI
CAS
2006年第1期29-32,53,共5页
Journal of Shenyang University of Technology
关键词
等通道转角度挤压
镁合金
微观组织
晶粒细化
超塑性
equal channel angular pressing
magnesium alloy
microstructure
grain refinement
superplasticity
