热处理对ZA52-xNd镁合金组织和性能影响.pdf

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热处理对ZA52一xNd镁合金组织及性能的影响
曹喜娟,耿莹晶,陈晋生
(山西江淮重工有限责任公司,山西晋城 048008)
摘要:采用金相显微镜、x射线衍射仪、扫描电镜和电子万能试验机等手段,研究了T6处理(固溶+时效)对ZA52-xNd镁
合金显微组织、断口形貌及力学性能等影响。试验结果表明:与铸态相比,ZA52镁合金经335℃x16h+l75℃x12h热处理
后,随着Nd含量的增加合金的抗拉强度呈现与之相同的变化趋势(先上升后下降),但是抗拉强度较铸态有明显提高,而伸
长率有所下降。%Nd时,抗拉强度和伸长率均达到最大值,分别为233MPa,%。经过时效处理后,合
(A1,zn) 相沿晶界连续或不连续析出,起到了晶界强化和弥散强化的作用。
关键词:ZA52镁合金;固溶处理;时效处理;显微组织;力学性能
中图分类号: 文献标识码:A 文章编号:1001—4977(2010)07—0717—04
InfluencesofHeat Treatment on Microstructure and MechanicaI
PropertiesZA52-xNdof MagnesiumAlloy
CAOXi-juan,GENG Ying-jing,CHEN Jin—sheng
(ShanxiJianghuai Heavy Co.,Ltd.,Jincheng Industry 048008,Shanxi,China)
Abstract:The micrOstructure,mechanicaI properties and fracture modes ofZA52-xNd magnesium
alloy after T6 after heat—treatment(including alloy and solution aging treatment)were observed and analyzed
by metallographic microscope, diffraction,electronic universaI materials testing machine and
scanning electron microscopy(SEM).Thescanning electron pared alloy,thethat results as-cast tensile with
magnesium heat treatment solid solutionof335℃ at 6 hand for1
foIlowed the aging75 at 1 ℃2 for h,with1 the increasing of Nd content,take on the same trend of
increasingand first then strength was improve