热处理对Mg728Li802Y合金显微组织和力学性能的影响.pdf

热处理对Mg·7．28Li-8．02Y合金显微组织和力学性能的影响 赵亮。赵平 (西华大学材料科学与工程学院，四川成都610039) 摘要：用真空熔炼、真空热处理方法研究了超轻Mg-7．28Li一8．02Y合金的显微组织和力学性能，以及热处 面有晶粒长大，另一方面长时间时效使Mg在p相中固溶度降低，0【相沿p相晶界析出，导致合金硬度、强 度及塑性有所下降。 关键词：镁锂合金；固溶处理；显微组织；抗拉强度 中图分类号：TGll3．25文献标识码：A 文章编号：0254_6051(2008)08—吣37删 EffectofheattreatmentonmicrostructureandmechaIlical of properties M2．7．28Li名．02Yalloy ZHAO“ang，ZHAOPing ofMaterialsScienceaIld SichuaIl 610039，China) (College Engineering，XihuaUniversity，Chengdu microstmctureandmechanical oft}le wereresearched Abstract：The pmpertiessuperlightMg_7．28Li一8．02Yalloy by vacuum andvacuum theinnuence ofheattreatmentforthe wasalsostud— melting heatingtreatment，and regularity alloy results in ied．The showthatthe Li-8．02Ycontains matrix，仅(Mg)ph酗eand—y castingMg-7．28 alloy p(“)phase distribute 0f stmcture．The boundaryphase鹊network quenching (M924Y5)phasemainly alongthe铲ain B f而m300℃to500℃enablesthesolid andtlle hardnessof in solubilit)rquenching Mgand^y(M924Y5)phasepphase tobe the increasesto tensile hasa substantial increased．Meanwhile，whenquenchingtemperature 500℃，the strength of after at increasebecausemuchmoresolid andunifo瑚distribution solubility of舀obular1(M924Y5)phase．Buta西ng on the the solids