| 引用本文: | 朱晓春,刘子利,周桂斌,李健.Sb对Mg-5Al-2Sr合金组织和性能的影响[J].材料科学与工艺,2012,20(5):60-65.DOI:10.11951/j.issn.1005-0299.20120512. |
| ZHU Xiao-chun,LIU Zi-li,ZHOU Gui-bin,LI Jian.Effects of Sb addition on microstructure and properties of Mg-5Al-2Sr alloy[J].Materials Science and Technology,2012,20(5):60-65.DOI:10.11951/j.issn.1005-0299.20120512. |
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| 摘要: |
| 采用表面活性元素Sb微合金化的方法制备了Mg-5Al-2Sr-xSb(x=0,0.3,0.6,1.0)合金,通过金相显微镜、X射线衍射仪、扫描电镜和力学性能测试等方法研究了Sb含量对Mg-5Al-2Sr合金微观组织和力学性能的影响.结果表明,Mg-5Al-2Sr-xSb合金铸态组织主要由枝晶α-Mg、沿晶界或分布在枝晶间的层状或离异共晶的Al4Sr相、块状三元Mg9Al3Sr相(τ相)和颗粒状SbSr2相组成,随着Sb含量的增加,SbSr2相的数量逐渐增多,τ相逐渐减少.Sb的质量分数为0.6%时,断续分布的Al4Sr相和细小弥散分布的SbSr2相能够提高Mg-5Al-2Sr合金的室温和高温(150 ℃)机械性能. |
| 关键词: Mg-5Al-2Sr Sb 碱土 显微组织 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20120512 |
| 分类号: |
| 基金项目:江苏省自然科学基金资助项目(BK2009577);江苏省科技支撑计划资助项目(BE2010103). |
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| Effects of Sb addition on microstructure and properties of Mg-5Al-2Sr alloy |
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ZHU Xiao-chun1, LIU Zi-li1, ZHOU Gui-bin1, LI Jian2
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1.College of Materials Science and Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;2.Jiangsu Favour Automotive New Stuff Sci-Tech Co.,Ltd,Changshu 215542,China
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| Abstract: |
| Mg-5Al-2Sr-xSb(x=0,0.3,0.6,1.0)alloys were prepared by micro-alloying method of surface active elements Sb.The effects of Sb content on the microstructure and mechanical properties of Mg-5Al-2Sr were studied by optical microscope,X-ray diffraction,scanning electron microscopy (SEM) and mechanical property testing,etc.The results indicate that the as-cast microstructure of Mg-5Al-2Sr alloy consists of dendrite α-Mg,lamellar or divorced eutectic Al4Sr which distributed along the grain boundaries or between dendrites,ternary bulky Mg9Al3Sr phase (τ phase) and granular SbSr2 phase.With the increase of Sb content,the number of SbSr2 phase gradually increases and τ phase gradually reduces.With 0.6% Sb addition,the mechanical properties of Mg-5Al-2Sr alloy at room temperature and high temperature(150 ℃) are both improved,which attribute to the discontinuous distribution Al4Sr phase and fine dispersed SbSr2 phase. |
| Key words: Mg-5Al-2Sr Sb alkaline earth microstructure mechanical properties |
