AZ31B镁合金的热压缩变形研究  

Study on Hot Compression Deformation of AZ31B Magnesium Alloy

作　　者：胡丽萍[1] Hans Peter Degischer 郭领[1] 王鹏[1] 侯圣英[1] 

机构地区：[1]中国兵器科学研究院宁波分院烟台事业部,山东烟台264003 [2]维也纳科技大学材料学院,奥地利维也纳1040

出　　处：《热加工工艺》2008年第12期23-25,共3页Hot Working Technology

基　　金：国家留学基金资助项目

摘　　要：采用Gleeble-1500D热模拟机,对AZ31B镁合金在温度为260～420℃、应变速率为0.03、0.1、1、3s-1时,应变量为70%的塑性变形行为以及热压缩后镁合金组织的变化进行了研究。分析了流变应力与应变速率和温度的关系。结果表明:该材料在420℃及应变率0.1s-1时可发生动态再结晶,也是最优的热加工工艺参数;在260℃,应变率为0.03s-1的区域可能出现楔形裂纹;热压缩后晶粒明显得到细化,出现大量细小的等轴晶。The Gleeble-1500D was used to investigate the compression deformation of AZ31B magnesium alloy at the deformation temperature of 260-420 ℃ and various strain rates （0.03, 0.1, 1 and 3 s-1） under the deformation degree of 70%. The microstructure of AZ3 IB magnesium alloy after deformation was also studied. The relationship between flow stress and deformation temperature was analyzed. The results show that the material undergoes dynamic recrystallization at 420 ℃ and 0.1 s-1, which are the optimum parameters for hot compression. At 260 ℃ and strain rates below 0.03 s-1, wedge cracking occurs in the material. The grains are obviously finer after hot compression. A great deal of equiaxed crystal has been found due to the dynamic recrystaUization.

关 键 词：AZ31B镁合金 压缩变形 流变应力 动态再结晶 

分 类 号：TG146.22[一般工业技术—材料科学与工程]