Effect of La-Ce mischmetal on microstructure and properties of AZ91D alloy

doi:10.13251/j.issn.0254-6051.2021.12.021

Abstract

Abstract: Taking AZ91D magnesium alloy as the research object, the effect of La-Ce mischmetal content on microstructure and properties was investigated. The results show that with the adding of La-Ce mischmetal, the as-cast microstructure is network β-Mg₁₇Al₁₂ phase and a few rod-shaped rare earth compounds. With the increase of rare earth content, the β-Mg₁₇Al₁₂ and rod-shaped rare earth compounds are refined. After solid solution and aging, with the increase of rare earth content, the elongation of the tested alloy increases, the hardness and tensile strength first increase and then decrease. When the La-Ce mischmetal content is 2.38%, the mechanical properties of the alloy are the best.

Key words: AZ91D magnesium alloy, La-Ce mischmetal, microstructure, mechanical properties

CLC Number:

TG164.2

Chen Lichao, Su Zhicheng, Ren Jingtao, Fang Liqiang, Wang Zichao, Wang Yuyu, Zhao Liping. Effect of La-Ce mischmetal on microstructure and properties of AZ91D alloy[J]. Heat Treatment of Metals, 2021, 46(12): 130-134.

References

[1]史文方, 周昆. 我国镁合金的开发应用现状及展望[J]. 汽车工艺与材料, 2004(6): 34-39.
Shi Wenfang, Zhou Kun. The application and outlook of magnesium alloy development in China[J]. Automobile Technology and Material, 2004(6): 34-39.
[2]王渠东, 丁文江. 镁合金研究开发现状与展望[J]. 世界有色金属, 2004(7): 8-11.
Wang Qudong, Ding Wenjiang. Status and prospects of magnesium alloys research/development[J]. World Nonferrous Metals, 2004(7): 8-11.
[3]杨明波, 李晖, 胡红军. 耐蚀镁合金的研究现状及进展[C]//2010年中国铸造活动周. 2011: 227-231.
[4]李凌杰, 李芳君, 雷惊雷, 等. 合金元素对镁合金耐腐蚀性能影响的研究进展[J]. 材料导报, 2011, 25(19): 110-113.
Li Linjie, Li Fangjun, Lei Jinglei, et al. Research progress in effect of alloying elements on anti-corrosion performance of magnesium alloys[J]. Materials Review, 2011, 25(19): 110-113.
[5]范艳艳. 合金元素对AZ91D镁合金组织和性能的影响[D]. 太原: 太原科技大学.
[6]崔忠圻, 覃耀春. 金属学与热处理[M]. 北京: 机械工业出版社, 2007.
[7]赵莉萍. 金属材料学[M]. 北京: 北京大学出版社, 2012.
[8]刘宗昌, 任慧平, 宋义全, 等. 金属固态相变教程[M]. 北京: 冶金工业出版社, 2011.
[9]张津, 章宗和. 镁合金及应用[M]. 北京: 化学工业出版社, 2004.
[10]胡赓祥, 蔡珣, 戎咏华. 材料科学基础[M]. 上海: 上海交通大学出版社, 2010.
[11]丁文江. 镁合金科学与技术[M]. 北京: 科学出版社, 2007
[12]黄正华. AZ91D-M镁合金组织与性能的研究[D]. 西安: 西安理工大学, .
[13]Lü Zhong, Zhou Jian, Sun Zhimei. Effect of rare earth elements on the structures and mechanical properties of magnesium alloys[J]. Materials Science, 2013, 58(7): 816-820.
[14]Li X, Xiong S M, Guo Z. Failure behavior of high pressure die casting AZ91D magnesium alloy[J]. Materials Science and Engineering A, 2016, 672: 216-225.
[15]Han Baojun, Gu Dongdong, He Qiong, et al. Fabrication of a novel Mg-RE (Nd, Ce) intermetallic compound coating by molten salt diffusion and its effect on corrosion resistance of magnesium alloys[J]. Journal of Rare Earths, 2016, 34(7): 731-735.