Mg-Y-Zn-Si合金的热压缩行为研究  

Study on Hot Compression Behavior of Mg-Y-Zn-Si Alloy

作　　者：路绚铮 王芳[1] 柳伟 侯华 LU Xuan-zheng;WANG Fang;LIU Wei;HOU Hua(School of Material Science and Engineering,Taiyuan University of Science and Technology,Taiyuan Shanxi 030024,China;School of Material Science and Engineering,North University of China,Taiyuan Shanxi 030051,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]中北大学材料科学与工程学院,山西太原030051

出　　处：《铸造设备与工艺》2024年第6期37-41,共5页Foundry Equipment & Technology

基　　金：国家自然科学基金资助项目(52275390,52201146)。

摘　　要：通过热压缩试验研究了均匀化态Mg_(98.5)Y_(1)Zn_(0.5)Si_(2)合金在变形温度为250℃~325℃、应变速率为0.001 s^(-1)~1 s^(-1)条件下的热压缩变形行为,获得了其在不同变形条件下的真应力-应变曲线。结果表明,Mg_(98.5)Y_(1)Zn_(0.5)Si_(2)合金的峰值应力随着变形温度的升高而降低,随着应变速率的增大而变大。采用峰值应力建立合金的热加工图,发现合金的失稳区域主要出现在变形温度为250℃~260℃,速率为1 s^(-1)以及275℃~325℃,速率为0.1 s^(-1)~1 s^(-1)的范围;合金的最佳加工窗口为温度265℃~320℃,速率为0.001 s^(-1)~0.01 s^(-1)的范围。The thermal deformation behavior of homogenized Mg_(98.5)Y_(1)Zn_(0.5)Si_(2)magnesium alloy at the deformation temperature of 250℃~325℃and strain rate of 0.001 s^(-1)~1 s^(-1)was studied by hot compression experiment.The true stress-strain curves under different deformation conditions were gotten.The results show that the peak stress of Mg_(98.5)Y_(1)Zn_(0.5)Si_(2)alloy reduces with the increasing temperature and rises with the increase of strain rate.The hot processing map of Mg_(98.5)Y_(1)Zn_(0.5)Si_(2)alloy was established by the value of peak stress,and it was found that the instability region of the alloy mainly appeared in the deformation temperature of 250℃~260℃and the strain rate of 1 s^(-1)and the deformation temperature of 275℃~325℃and the strain rate of 0.1 s^(-1)~1s^(-1).The optimum processing window of the alloy is the temperature 265℃~320℃and the strain rate is in the range of 0.001 s^(-1)~0.01 s^(-1).

关 键 词：Mg-Y-Zn合金 热压缩行为 显微组织 热加工图 

分 类 号：TG146[一般工业技术—材料科学与工程]