AZ31B镁合金动态冲击变形机制研究  

Deformation Mechanism of Dynamic Impact Behavior for AZ31B Magnesium Alloy

作　　者：耿长建[1] 武保林[2] 刘芳[1] 佟文伟[1] 韩振宇[1] 

机构地区：[1]中航工业沈阳发动机设计研究所,沈阳110015 [2]沈阳航空航天大学材料科学与工程学院,沈阳110136

出　　处：《航空发动机》2015年第3期61-65,共5页Aeroengine

基　　金：国家自然科学基金(51171120;90202001)资助

摘　　要：为了研究AZ31B镁合金挤压棒材的各向异性,利用Hopkinson压杆,研究了在大气压为0.2、0.5 MPa下的径向与轴向样品的动态冲击力学行为。在同一大气压下,通过对径向与轴向样品不同动态力学行为影响的研究,深入分析了晶粒取向与Schmid因子对其微观变形机制的影响。结果表明:在同一冲击气压下,轴向样品的屈服强度、断裂强度和总应变量均高于径向样品的对应值;2种样品的屈服强度、断裂强度和总应变量均随着应变速率的增加而增加,但径向冲击样品的应变速率敏感性高于轴向冲击样品的,体现了不同变形机制的作用。The AZ31B Magnesium alloy was studied in order to reveal the anisotropy of the extruded bar.Dynamic impact tests for radial and axial samples were conducted respectively by using Hopkinson pressure bar at room temperature and the constant pressure （0.2 MPa and 0.5 MPa）.The impact of grain orientation and Schmid factor on mechanical behaviors of Magnesium alloys through their effect on the deformation modes obtained by analyzing the influence of the same pressure on the dynamic behavior of radial and axial samples.The results show that the yielding strength,fracture strength,total strain of axial samples are larger than that of radial samples at the same air pressure（strain rate）.The yielding strength,fracture strength,total strain all increase with strain rate increasing for both axial samples and radial samples.The strain rates of adial samples were higher than that of axial samples.The results embodied the function of different deformation mechanisms.

关 键 词：AZ31B镁合金 动态冲击 变形机制 织构 孪晶 Schmid因子 

分 类 号：V216.55[航空宇航科学与技术—航空宇航推进理论与工程]