热处理对挤压变形Mg12Gd3Y06Zr合金力学性能及显微组织的影响.pdf

下半月出版 MaterialHeatTreatmentl材料热处理技术 力学性能及显微组织的影响 胡韶华，陈志永，李冰峰，刘楚明 (中南大学材料科学与工程学院，湖南长沙410083) 摘要：采用硬度检测、拉伸力学性能测试、金相、扫描及透射电镜观察等方法．研究了挤压态Mg一12Gd一3Y一0．6Zr 合金经T4、T5和T6热处理后显微组织及力学性能的变化。结果表明：挤压态合金宜采用T5热处理。经T5热处理后， 镜片状第二相。T6热处理时，虽然合金的时效强化效果优于T5态合金．但晶粒长大严重降低了合金的力学性能。 6Zr合金；挤压；同溶；时效；显微组织；力学性能 关键词：Mg。12Gd．3Y．0 中图分类号：TGl56．9 文献标识码：A 文章编号：1001—3814(2011)22．0151．03 EffectsofHeatTreatmentonMicrostructureandMechanical Properties of As．extruded Mg一12Gd-3Y-0．6ZrAlloy HU Shaohua，CHEN Zhiyong，LIBingfeng，LIUChuming Scienceand South (SchoolofMaterials Engineering,Central University，Changsha410083，China) microstructureandmechanicalvariation 6Zr as—extrudedafter Abstract：The properties ofMg一12Gd·3Y-0alloy T4，T5 andT6heattreatmentwerestudied hardness testandmicrosrructure resultsshowthatthe through test，tensile analysis．The hardnessand ofas—extruded afterdifferentheattreatment．The andtensile strength alloychangeobviously yieldstrength MPaand403 areobtainedforT5 forT5treatmentare372 bettermechanical strength MPa，respectively．The properties treatmentbecausethe second exists forT6treatmentis in the effect prismaticphaselargely alloy．Althoughagestrengthening betterthanthatforT5 mechanicalisdecreasedthe treatment，the properties by graingrowthobviously．