热挤压态ZK60镁合金动态力学行为研究  

Dynamic Mechanical Behavior of Hot Extruded ZK60 Magnesium Alloys

作　　者：杨亚琴[1] 张治民[1] 李保成[1] 王子田[1] 胡扬[1] 

机构地区：[1]中北大学材料科学与工程学院,山西太原030051

出　　处：《热加工工艺》2015年第11期41-42,46,共3页Hot Working Technology

基　　金：山西省自然科学基金项目(2012011022-2;2013011022-5)

摘　　要：通过Hopkinson压杆冲击试验,对高应变率下热挤压态高强度ZK60镁合金的动态力学行为进行了研究。得出的主要结论如下:挤压态ZK60合金的动态流变应力与应变率成比例,断裂强度随应变率升高而升高。在大的应变率下,ZK60合金试样的动态真应力—真应变曲线存在明显的屈服点和屈服平台。随着冲击应变率增大,断裂应变增大,容易产生细化的孪晶组织。The dynamic mechanical behavior of hot extruded high strength ZK60 magnesium alloy at high strain rates was studied by Hopkinson pressure bar experiment. The major conclusions can be obtained as following： dynamic flow stress of deformed ZK60 alloy is proportional to strain ratio, and the fracture strength rises with the rising strain ratio. There is obvious yield point and yield platform on the dynamic strain-stress curves of ZK60 alloy at high strain ratios. With the rising impact strain ratio, the fracture strain rises, and the refining twinning crystals are easily produced.

关 键 词：ZK60镁合金 热挤压 Hopkinson试验 动态应力—应变曲线 孪晶 

分 类 号：TG376.2[金属学及工艺—金属压力加工]