Mg-5Sm-(3,4)Gd合金热压缩行为的对比研究  

Comparative Research on Hot Compression Behavior of Mg-5Sm-(3,4)Gd Alloys

作　　者：赵洁 崔扬[2] 张清[1] 李萍[2] 王莹[2] Zhao Jie;Cui Yang;Zhang Qing;Li Ping;Wang Ying(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;School of Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]洛阳理工学院土木工程学院,河南洛阳471023

出　　处：《中国稀土学报》2024年第6期1178-1186,I0004,共10页Journal of the Chinese Society of Rare Earths

基　　金：河南省科技攻关计划项目(222102230112)资助。

摘　　要：采用Gleeble-1500热模拟试验机对铸态的Mg-5Sm-3Gd和Mg-5Sm-4Gd合金进行了变形温度在350~500℃,应变速率在0.01~1 s^(-1)条件下的热压缩实验,确定其发生动态再结晶的临界应变与峰值应变的关系,构建了两种合金的热变形本构方程以及热加工图。结果表明:两种合金的流变应力曲线均有明显的动态再结晶特征,在相同条件下Mg-5Sm-4Gd的峰值应力和流变应力均高于Mg-5Sm-3Gd合金。其发生动态再结晶的临界应变几乎都是峰值应变的1/2,升高变形温度或降低应变速率会使发生再结晶的临界应变减小。Gd含量的增加使热变形激活能增大,减缓动态再结晶的发生,但两种合金的热加工图基本一致。The hot compression tests of the as-cast Mg-5Sm-3Gd alloy and Mg-5Sm-4Gd alloy were carried out by using a Gleeble-1500 thermal simulation test machine at deformation temperature of 350–500℃and the strain rate of 0.01-1 s^(-1).The critical strain and peak strain of dynamic recrystallization were determined.The constitutive equations and the hot processing maps of alloys were established.The results show that the flow stress curves of these alloys have obvious dynamic recrystallization characteristics.Under the same conditions,the peak stress and flow stress of Mg 5Sm-4Gd alloy are higher than those of Mg-5Sm-3Gd alloy.The critical strain for dynamic recrystallization is almost half of the peak strain.The critical strain of recrystallization can be reduced by increasing deformation temperature or decreasing strain rate.The increase of Gd content increases the activation energy of thermal deformation and slows down the occurrence of dynamic recrystallization,but the hot processing maps of the alloys are basically the same.

关 键 词：Mg-5Sm-(3 4)Gd合金 热压缩 临界应变 激活能 热加工图 

分 类 号：TG146.2[一般工业技术—材料科学与工程]