时效处理快速凝固Mg-5wt.%Sn合金微观结构的电子显微分析
马玉荣，游光，赵东山*，庄园林，叶礼，聂鑫，王建波，桂嘉年
（武汉大学物理科学与技术学院，电子显微镜中心和人工微结构教育部重点实验室，湖北 武汉430072）
摘 要 用显微维氏硬度仪、X射线衍射仪（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究分析了快速凝固Mg-5wt.%Sn合金条带的时效硬化规律。实验结果表明，快速凝固Mg-5wt.%Sn合金在593K温度下时效3h后达到峰值硬度。时效后峰值硬度下的快速凝固Mg-5wt.%Sn合金中有β-Mg2Sn相颗粒析出，大多数的析出相β-Mg2Sn颗粒分布在晶界，少部分析出相β-Mg2Sn颗粒分布在晶粒内部。在593K温度下时效3h后的合金中观察到析出相β-Mg2Sn颗粒与基体α-Mg的一种新取向关系: (-2-0-2-2-6-1)B//(0-110)a，（7-2-36）B//（0001）a,[-512]B//[2-1-10]a.
关键词 镁锡合金；显微硬度；析出相
中图分类号：TG146.22；TG115.21+5.3；TG115.23 文献标识码：A doi:10.3969/j.issn.1000-6281.2016.04.006
Electron microscopy study in microstructure of a rapidly solidified Mg-5wt.%Sn alloy with aging treatment
MA Yu-rong，YOU Guang，ZHAO Dong-shan*，ZHUANG Yuan-lin，YE Li，NIE Xin，WANG Jian-bo，GUI Jia-nian
（School of Physics and Technology, Center for Electron Microscopy and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan Hubei 430072, China）
Abstract Age-hardening behavior of the rapidly solidified Mg-5wt.%Sn alloy was observed and analyzed by a micro-Vikers hardness tester, X-ray diffraction (XRD) , scanning electron microscopy (SEM) , and transmission electron microscopy (TEM) . The results show that the alloy will respectively reach its peak-hardness after aging-treated at 593K for 3h, while the secondary precipitated phase β-Mg2Sn appears along the grain boundary and some appear inside the grain. After aging-treated at 593K for 3h, a new orientation relationship was found: (-2-0-2-2-6-1)B//(0-110)a，（7-2-36）B//（0001）a,[-512]B//[2-1-10]a.
Keywords magnesium-tin alloy；micro hardness；precipitated phase
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[1] MORDIKE B L，EBERT T. Magnesium properties-applications-potential [J]. Materials Science and EngineeringA，2001，302:37-45.
[2] ZHANG H，YAN Q Q，LI L X. Microstructures and tensile properties of AZ31 magnesium alloy by continuous extrusion forming process [J]. Materials Science and Engineering A，2008，486:295-299.
[3] WANG X F，ZHAO J Z，HE J，et al. Hot rolling characteristics of spray-formed AZ91 magnesium alloy[J].Transactions of Nonferrous Metals Society of China，2007，17：238-243.
[4] RAVI KUMAR N V，BLANDIN J J，DESRAYAUD C，et al. Grain refinement in AZ91 magnesium alloy during thermomechanical processing [J]. Materials Science and Engineering A，2003，359：150-157.
[5] MORDIKE B L.Creep-resistant magnesium alloys[J]. Materials Science and Engineering A，2002，324：103-112.
[6] DERGE G，KOMMELL A R，MEHL R F. Studies upon the Widmanstatten structure IX—the Mg-Mg2Sn and Pb-Sb Systems[J]. Transaction of American Institute of Mining，Metallurgical，and Petroleum Engineers，1937，124:367-378.
[7] BOWLES A L，BLAWERT C，HORT N，et al. Microstructural investigations of the Mg-Sn and Mg-Sn-Al alloy systems [J]. Magnesium Technology，2004：307-310.
[8] WEI S H，CHEN Y G，TANG Y B，et al. Compressive creep behavior of as-cast and aging-treated Mg–5 wt.% Sn alloys [J]. Materials Science and Engineering A，2008，492:20-23.
[9] 聂鑫. 铸态及快速凝固镁锡和镁钆锌合金中析出相的透射电子显微学研究[D]. 湖北: 武汉大学，2015年.
[10] KLEMENT JUN W，WILLENS R H，DUWEZ P. Non-crystalline structure in solidified gold-silicon alloys [J]. Nature，1960，187：869-870.
[11] VOLKOVA E F，LEBEDEV V M，GUREVICH F L. Effect of the cooling rate in crystallization on the structural and phase state of deformable magnesium alloys [J]. Metal Science and Heat Treatment，1998，40（7）：289-293.
[12] RANGELOVA V，SPASSOV T. Primary crystallization kinetics in rapidly quenched Mg-based Mg-Ni-Y alloys [J]. Journal of Alloys and Compounds，2002，345:148-154.
[13] SASAKI T T，JU J D，HONO K，et al. Heat-treatable Mg-Sn-Zn wrought alloy [J]. Scripta Materialia，2009，61：80-83.
[14] ZHANG M，ZHANG W Z，ZHU G Z，et al. Crystallography of Mg2Sn precipitates in Mg-Sn-Mn-Si alloy [J]. Trans Nonferrous Met Soc，China，2007，17：1428-1432.
[15] NIE X，GUAN Y M，ZHAO D S，et al. Transmission electron microscopy analysis of the crystallography of precipitates in Mg-Sn alloys aged at high temperatures[J]. Journal of Applied Crystallography，2014，47:1729-1735.
