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采用Hopkinson压杆技术,对300、340、380℃不同温度挤压后的AZK60镁合金,分别在1200、1500、2000、2600 s-1应变速率下进行室温冲击试验,探讨了高速冲击载荷下ZK60合金的力学响应及微观组织演变规律。结果表明:ZK60镁合金在冲击载荷下有明显的屈服和应变强化现象,最大应力随应变速率增加而不断增加。挤压温度对其力学性能有较大影响,300℃变形后的试样动态屈服强度最大。高速冲击后组织更细密,随应变率的提高,组织中的孪晶越多越细,密度越来越大,并出现孪晶交接使晶粒细化。
The Hopkinson pressure bar technology was used to test the AZK60 magnesium alloy extruded at different temperatures of 300, 340 and 380 ℃ at room temperature at 1200, 1500, 2000 and 2600 s-1 respectively. The effects of ZK60 Mechanical Response of Alloys and Microstructure Evolution. The results show that ZK60 magnesium alloy has obvious yielding and strain strengthening under impact load, and the maximum stress increases with the increase of strain rate. The extrusion temperature has a great influence on its mechanical properties. The dynamic yield strength of the specimen after 300 ℃ deformation is the largest. After high-speed impact, the organization is finer. With the increase of strain rate, the more and more twins in the tissue become thinner, the density becomes larger and larger, and the twinning occurs to refine the grain.