| 引用本文: | 李爱文,刘江文,伍翠兰,罗承萍,焦东玲,朱红梅.铸造Mg-3Zn-0.5Cu-0.6Zr镁合金的时效析出行为研究[J].材料科学与工艺,2010,18(6):883-888.DOI:10.11951/j.issn.1005-0299.20100630. |
| LI Ai-Wen,LIU Jiang-wen,WU Cui-lan,LUO Cheng-ping,JIAO Dong-ling,ZHU Hong-mei.A study of precipitation behabior of cast Mg-3Zn-0.5Cu-0.6Zr magnesiym alloy[J].Materials Science and Technology,2010,18(6):883-888.DOI:10.11951/j.issn.1005-0299.20100630. |
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| 摘要: |
| 利用金相显微镜、显微硬度计、X射线衍射仪、扫描和透射电镜研究了铸造Mg-3Zn-0.5Cu-0.6Zr镁合金铸态和固溶时效后的显微组织,初步确定了时效Mg-3Zn-0.5Cu-0.6Zr镁合金中主要合金相的种类和形态.合金铸态组织主要由初晶Mg基体和(Mg+Mg2Cu,CuMgZn)共晶组成.固溶后,晶界处大部分非平衡共晶组织溶解;180℃/20h时效后达到合金时效硬度峰值,此时晶内析出相主要有三类:(1)轴线垂直于(0001)Mg,板条状或棱柱状β2’-MgZn2,长度50nm～200nm,该相是合金的主要时效硬化相;(2)较粗大的、其轴线仍与基面垂直的六棱柱状β2’-MgZn2;(3)轴线平行于(0001)Mg,板条状或针状β-MgZn,长度50nm～150nm. |
| 关键词: Mg-Zn-Cu镁合金 显微组织 CuMgZn MgZn2 MgZn |
| DOI：10.11951/j.issn.1005-0299.20100630 |
| 分类号:TG136.1 |
| 基金项目:广东省自然科基金项目资助(070006483);国家重点基础研究“973”项目资助(2009CB623704;2008CB617608) |
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| A study of precipitation behabior of cast Mg-3Zn-0.5Cu-0.6Zr magnesiym alloy |
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LI Ai-Wen1,2, LIU Jiang-wen1,2, WU Cui-lan3, LUO Cheng-ping1,2, JIAO Dong-ling1,2, ZHU Hong-mei1,2
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1.School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;2.School of Materials Science and Engineering,Hunan University,Changsha 410082,China;3.School of Materials Science and Engineering,Hunan University,Changsha 410082,China
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| Abstract: |
| The types and nature morphologies of precipitates in as-cast and aged Mg-3Zn-1.5Cu-0.6Zr magnesium alloy were studied.The microstructure of the as-cast alloy was composed of Mg matrix and nonequilibrium eutectic(Mg+Mg2Cu,CuMgZn) formed at grain boundaries,and most of the nonequilibrium eutectic were dissolved after solution treatment at 440 ℃.Three types of precipitates were found after aging at 180 ℃ for 20 h.The first type(lath-like) was MgZn2 with length of 50~200nm and very high density,which was perpendicular to the base plane of the Mg matrix and primarily responsible for the hardening of the alloy.The second type(lath-like or neddle-like) was MgZn with length of about 50~150 nm,which was parallel to the base plane.The third one(plate-like) was MgZn2 with length of about 50~100nm,which was also parallel to the base plane. |
| Key words: Mg-Zn-Cu magnesium alloy microstructure CuMgZn MgZn2 MgZn |
