粗晶LC4合金的超塑拉伸行为  

Behavior of Superplastic Tensile Strain of Coarse Crystalline LC4 Aluminium Alloy

作　　者：张维[1] 郭鸿镇[1] 周洪强[1] 赵张龙[1] 姚泽坤[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《热加工工艺》2005年第2期18-20,共3页Hot Working Technology

摘　　要：研究了粗晶LC4合金的超塑性能、超塑性条件及微观组织演变规律等。结果表明,粗晶 LC4 合金在适当的变形温度及速度条件下具有一定的超塑性。所得较佳变形温度为 430℃,较佳应变速率为 1.1×10-2 s-1,在此条件下,试样的伸长率可达到124%~140%,流动应力不超过 46.9 MPa。粗晶 LC4 合金在较低温度和较高应变速率条件下,因能产生有效的再结晶细化而呈现出一定的超塑性。试样断口呈现出空洞长大、连接和晶间断裂的特征。The superplasticity and superplastic condition and microstruture development rule of coarse crystalline LC4 Aluminium Alloy was investigated. The results show that coarse crystalline LC4 Aluminium Alloy can present certain superplasticity at proper deformation temperature and velocity. The optimal superplastic deformation condition is 430℃ and 1.1×10^(-2)s^(-1),on which the elongation is 124%～140% and the flow stress is less than 46.9MPa. Coarse crystalline LC4 Aluminium Alloy presents certain superplasticity at lower deformation temperature and higher strain rate because it can create effective recrystallize refinement. The specimen fracture presents cavity growth and conection and leads to intercrystalline fragmentation.

关 键 词：粗晶 LC4合金 超塑性 再结晶 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG306[金属学及工艺—金属材料]