挤压加工对Mg-Sm-Zn-Zr合金组织和散热性能的影响  

Effect of Extrusion Processing on Microstructure and Heat Dissipation Capability of Mg-Sm-Zn-Zr Alloy

作　　者：张波 张书强[4,5,6] 吴广新 ZHANG Bo;ZHANG Shuqiang;WU Guangxin(Guiyang Industrial Technology Institute,Guiyang Guizhou 550081,China;Guiyang Industrial Technology Institute Co.,Ltd.,Guiyang Guizhou 550081,China;Guiyang Vocational and Technical College,Guiyang Guizhou 550082,China;State Key Laboratory of Advanced Special Steel,Shanghai 200444,China;Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai 200444,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]贵阳产业技术研究院,贵州贵阳550081 [2]贵阳产业技术研究院有限公司,贵州贵阳550081 [3]贵阳职业技术学院,贵州贵阳550082 [4]省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [5]上海市钢铁冶金新技术开发应用重点实验室,上海200444 [6]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2019年第5期36-41,共6页Shanghai Metals

基　　金：贵阳市科技计划项目([20161001]6-1号)

摘　　要：以Mg-5.0Sm-0.6Zn-0.5Zr(质量分数,%)合金为研究对象,考察了挤压和时效处理对合金微观组织和散热性能的影响。结果表明:挤压加工使合金的晶粒显著细化,析出相富集在挤压带上,时效处理后,合金晶粒略微粗化。挤压比越大,合金的散热性能提升越明显,挤压后再进行时效处理,合金的散热性能进一步提升,其原因在于挤压析出和时效析出时,第二相消耗了在Mg基体中作为传热电子散射中心的合金元素。合金在400℃经过挤压比为35的挤压加工再经200℃、24 h人工时效后的散热性能最佳。Effects of extrusion processing and aging on the microstructure and heat dissipation capability of Mg-5.0Sm-0.6Zn-0.5Zr(mass fraction,%)alloy were investigated.The results showed that the extrusion processing remarkably refined the grain of the alloy,and the precipitated phases were enriched in the extrusion zone,and that the grain was slightly coarsened after aging.The higher the extrusion ratio,the better the heat dissipation capability of the alloy was.After aging,the heat dissipation capability of the extruded alloy was further improved.The reason was that the alloy elements that serve as the heat transfer electron scattering center in Mg matrix were consumed during extrusion precipitation and aging precipitation of the second phase.The alloy had the best heat dissipation capability after extrusion processing at temperature of 400℃with extrusion ratio of 35 and then artificial aging at 200℃for 24 h.

关 键 词：Mg-Sm合金 挤压加工 时效 散热性能 

分 类 号：TG1[金属学及工艺—金属学]