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
全文下载请到万方数据库、同方知网数据库和重庆维普等数据库中下载!
[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.