金属学报  2010, Vol. 46 Issue (10): 1200-1205    DOI: 10.3724/SP.J.1037.2010.00209

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Sr对Mg-9Al-1Si-0.3Zn合金微观组织和力学性能的影响

邹志文,熊守美

清华大学机械工程系汽车安全与节能国家重点实验室, 北京 100084

EFFECTS OF Sr ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Mg–9Al–1Si–0.3Zn ALLOY

ZOU Zhiwen, XIONG Shoumei

Department of Mechanical Engineering, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084

邹志文 熊守美. Sr对Mg-9Al-1Si-0.3Zn合金微观组织和力学性能的影响[J]. 金属学报, 2010, 46(10): 1200-1205.
, . EFFECTS OF Sr ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Mg–9Al–1Si–0.3Zn ALLOY[J]. Acta Metall Sin, 2010, 46(10): 1200-1205.

摘要 参考文献 相关文章 Metrics 全文: PDF(2030 KB)   摘要: 研究了Sr元素对Mg-9Al-1Si-0.3Zn(质量分数,%)合金晶粒大小、力学性能和Mg2Si形貌的影响. 利用深腐蚀方法获得了Mg2Si细化前后的形貌, 通过其形貌变化规律研究了Sr元素对Mg2Si细化的机制.结果表明, Sr通过抑制Mg2Si生长使汉字状和加料斗形状的Mg2Si变成规则的正八面体. 当Sr的添加量达到0.32%时, Mg2Si的形貌得到了最好的改善. 同时, 合金的拉伸强度和塑性随着Sr的添加不断提高. 关键词 ： 镁合金,  微观组织,  力学性能,  细化机制,  Mg2Si     Abstract：Mg–Al–Si alloys (AS series alloys) with a high content of silicon performed low ductility and strengths because of large amount of coarse Chinese scripts Mg2Si particles distributed in the matrix. Trace elements, such as Ca, P, Sr and RE were selected to modify the morphology of Mg2Si particles. Among these, Sr showed remarkable modification effect, however, the modification mechanism was not clarified yet. In this work, the effects of Sr on the morphology of Mg2Si in Mg–9Al–1Si–0.3Zn (mass fraction, %) alloy and the mechanical properties were investigated, and the modification mechanism was explained by comparing Mg2Si morphologies. The Mg–9Al–1Si–0.3Zn alloy was composed of primary hopper Mg2Si particles of 40 μm in size, coarse Chinese scripts Mg2Si of 50—80 μm, island–like Mg17Al12 and the α–Mg matrix. 3D hopper crystals and Chinese scripts Mg2Si particles were extracted by the electrochemical method. Both morphologies reveal the"corner effect"which leads to the preferential growth orientation of edges and corners of the octahedron Mg2Si particle, respectively. When Sr was added into the alloy, the growth rates of both edges and corners of the Mg2Si particles were depressed significantly due to the adsorption of Sr on the surface of Mg2Si particles. When Sr addition went up to 0.32%, Mg2Si phase was fully modified to small polygonal particles of 5—20 μm. Moreover, the grain size of the alloy decreased from 210 μm to 160 μm with Sr increasing, which is in accord with the GRF (growth restriction factor) mechanism. The increasing of mechanical properties is mainly attributed to the refinement of Mg2Si phase. Key words： magnesium alloy    microstructure    mechanical property    refinement mechanism    Mg2Si 收稿日期: 2010-05-04      ZTFLH:  TG146.2   基金资助: 国家高技术研究发展计划资助项目2009AA03Z114 作者简介: 邹志文, 男, 1981年生, 博士生 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 邹志文 熊守美 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00209      或      https://www.ams.org.cn/CN/Y2010/V46/I10/1200 [1]Zhang Y, Liu L, Wei Z, Lu C. Special Casting and Nonferrous Alloys, 2005; 25: 604 (张赟龙,刘六法,卫中山,卢晨,特种铸造及有色合金, 2005; 25: 604） [2]Mabuchi M, Higashi K. Acta Mater, 1996; 44: 4611 [3]Kim J J, Kim D H, Shin K S, Kim N J. Scripta Mater, 1999; 41: 333 [4]Huang X F, Mao Z L, Yan Y F, Li Y D, Ma Y, Hao Y. J Rare Earth, 2006; 24: 480 (黄晓锋, 毛祖莉, 阎峰云, 李元东, 马颖, 郝远. 中国稀土学报, 2006; 24: 480) [5]Huang X F, Wang Q D, Zeng X Q, Zhu Y P, Lu C, Ding W J. J Rare Earth, 2004; 22: 361 (黄晓锋, 王渠东, 曾小勤, 朱燕萍, 卢晨, 丁文江. 中国稀土学报, 2004;22:361) [6]Zou Z, Xiong S. Mater Sci Forum, 2009; 610-614: 765 [7]Li S, Zou Z, Xiong S. 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