热处理对Mg-5Zn2Al镁合金组织和性能影响.pdf

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热处理对 Mg-5Zn2AI镁合金组织及性能的影响
Effect0fHeat Treatment on Structure and Mechanical
PropertiesofMg-5Zn2AI Alloys
曹喜娟黄晓锋朱凯田载有毛祖莉
(,兰州市 730050;
,兰州市 730050)
摘要:采用金相显微镜、电子万能试验机、扫描电镜等研究了热处理对 Mg一5Zn2A1镁合金组织及性能的
影响。结果表明:试验合金在经过 320~(2固溶 36h,175oC时效 16h后的合金的晶粒尺寸明显增大,晶界却变得
细小,晶界上析出物明显增多,而且合金经过热处理之后,该成分合金的抗拉强度达到最大 243MPa,伸长率达
%,使铸态下的 Mg一5Zn2A1镁合金相比综合力学性能得到了显著的提高。
关键词:Mg一5Zn2A1镁合金,热处理,显微组织,力学性能
中图分类号: 2:文献标识码:A;文章编号:1006—9658(2008)04—3
effects of heat treatment on micrOstructures and properties of Mg-5Zn2Af alloy have
been analysed by using metallographic microscope,electronic ma~hine materialstesting universal and
scanningelectron microscopy(SEM treatmentsolution solid),resulting 320oCafter at that36h in for and
followed the alloyaged75oc at for 1 alloy significantly increased grain size while grain bounda~
has e small,the grain boundary precipitates grow a lot;the alloy has been improved mechanical
properties,in particular the tensile strength and elongation was a conspicuous increase after heat—treat—
m ent,reaching peak 243MPa %,the 1 effectwas more visible thatthe mechanical propertieswas
higherthan the as—cast.
Keywords:Mg一5Zn2AlalIoy,heat treatment,m crostructure,mchanical properties
镁合金作为最轻质商用金属工程结构材料,因基面滑移有着较强的阻碍作用,从而提高镁合金的
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