利用Mg-20%(质量分数,下同)Ce中间合金对过共晶Mg-Si合金进行变质处理,研究了Ce加入量对该合金中初生Mg2Si相变质效果(主要是形态)的影响规律,并讨论其变质机制.研究结果表明:当加入量达到并超过0.4%以后,稀土Ce可有效变质过共晶Mg-Si合金中的初生Mg2Si相,其形态由粗大树枝晶转变为具有非规则外形的颗粒,且随Ce加入量增加到2.0%,Ce对初生Mg2Si相的变质均未产生明显的过变质现象.变质机理应主要与稀土元素富集于Mg2Si相生长表面并抑制优先生长晶向的生长有关.
参考文献
[1] | H. Dieringa;K. U. Kainer .Magnesium - der Zukunftswerkstoff für die Automobilindustrie?[J].Materialwissenschaft und Werkstofftechnik,2007(2):91-96. |
[2] | A. A. Luo .Recent magnesium alloy development for elevated temperature applications[J].International Materials Reviews,2004(1):13-30. |
[3] | P. Zhang .Creep Behavior-of the Die-Cast Mg-Al Alloy AS21[J].Scripta materialia,2005(4):277-282. |
[4] | G. Y. Yuan;Z. L. Liu;Q. D. Wang .Microstructure refinement of Mg-Al-Zn-Si alloys[J].Materials Letters,2002(1/2):53-58. |
[5] | A. Srinivasan;U. T. S. Pillai;B. C. Pai .Microstructure and Mechanical Properties of Si and Sb Added AZ91 Magnesium Alloy[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2005(8):2235-2243. |
[6] | 杨明波,潘复生,程仁菊,赵玮霖.Sr和Sb变质AZ61-0.7Si合金的铸态组织和力学性能[J].稀有金属材料与工程,2008(10):1737-1741. |
[7] | KIM J J;KIM D H;SHIN K S .Modification of Mg2Si morphology in squeeze east Mg-A1-Zn-Si alloys by Ca or P addition[J].Scripta Materialia,1999,41(03):333-340. |
[8] | QIN Q D;ZHAO Y G;ZHOU W et al.Effect of phosphorous on microstructure and growth manner of primary Mg2Si crystal in Mg2Si/Al composite[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2007,447(1-2):186-191. |
[9] | 黄晓锋,王渠东,刘六法,朱燕萍,袁广银,卢晨,丁文江.混合稀土对Mg-5Al-1Si组织及性能的影响[J].稀有金属材料与工程,2005(05):795-798. |
[10] | WANG H Y;JIANG Q C;MA B X et al.Modification of Mg2Si in Mg-Si alloys with K2TiF6,KBF4 and K2TiF6 + KBF4[J].Journal of Alloys and Compounds,2005,387(1-2):105-108. |
[11] | Jiang QC;Wang HY;Wang Y;Ma BX;Wang JG .Modification of Mg2Si in Mg-Si alloys with yttrium[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):130-135. |
[12] | 孙丰泉,王小东,严有为.Sb对原位Mg2Si/Mg复合材料组织的影响[J].特种铸造及有色合金,2005(01):18-20. |
[13] | 马宝霞,王丽萍,郭二军.镧对Mg-Si合金中Mg2Si相变质的影响[J].中国稀土学报,2008(01):87-91. |
[14] | Jun Du;Kazuhiko Iwai .Modification of Primary Mg_2Si Crystals in Hypereutectic Mg-Si Alloy by Application Alternating Current[J].Materials transactions,2009(3):562-569. |
[15] | MASSALSKI T B;MURRAY J L;BENNETT L H.Binary alloy phase diagrams[M].Ohio:American Society for Metals,1986:1544-1545. |
[16] | Yichuan Pan;Xiangfa Liu;Hua Yang .Microstractural formation In a hypereutectic Mg-Si alloy[J].Materials Characterization,2005(3):241-247. |
[17] | 胡汉起;沈宁福;姚山.金属凝固原理[M].北京:机械工业出版社,2000:81-83. |
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