混合稀土对AZ91D镁合金组织和力学性能的影响

金属学报, 2006, 42(8): 835-842. doi: 10.3321/j.issn:0412-1961.2006.08.011

混合稀土对AZ91D镁合金组织和力学性能的影响

郑伟超 ^1, , 李双寿 ^2, , 汤彬 ^3, , 曾大本 ^4,

1.清华大学基础工业训练中心,北京,100084;清华大学机械工程系,北京,100084

2.清华大学基础工业训练中心,北京,100084

3.清华大学工程力学系,北京,100084

4.清华大学机械工程系,北京,100084

基金项目: 北京市科技计划(Y0405004040211)

关键词： AZ91D镁合金 , 混合稀土 , 组织 , 力学性能 , 热分析

EFFECTS OF MISCHMETAL ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AZ91D MAGNESIUM ALLOY

研究了添加混合稀土(0.02%-1.2%,质量分数)对AZ91D镁合金晶粒大小、枝晶大小、共晶组织、凝固曲线特征参数和力学性能的影响.结果表明,混合稀土与合金中Al8(Fe,Mn)5或ε-AlMn相反应生成Al-RE-Mn三元相,减少了合金熔体中异质形核核心的数目,从而导致晶粒和枝晶的粗化;混合稀土还与Al反应生成Al11RE3相,消耗了部分Al,使得共晶组织减少.在砂型凝固条件下,随着混合稀土添加量的增加,AZ91D镁合金的初晶形核最低温度从595.2升到597.3℃;共晶最低温度先从427.7升到431.2℃,再降到428.7℃;共晶生长温度先从428.7升到431.8℃,再降到429.9℃;共晶再辉温差则存在波动.添加混合稀土降低了AZ91D镁合金的室温强度,但提高了合金的高温强度和延伸率.

参考文献

[1]	Mordike B L,Ebert T.Mater Sci Eng,2001; A302:37
[2]	Friedrich H,Schumann S.J Mater Process Technol,2001;117:276
[3]	Kaneko T,Suzuki M.In:Kojima Y,Aizawa T,Higashi K,Kamado S,eds.,Mater Sci Forum,Switzerland:Trans Tech Publications Ltd,2003,419-422:67
[4]	Chen L H,Liu Z,Lin L,Liang L C.Foundry,2004; 53(1):5 (陈力禾,刘正,林立,梁立超.铸造,2004;53(1):5)
[5]	Luo A A.In:Kojima Y,Aizawa T,Higashi K,Kamado S,eds.,Mater Sci Forum,Switzerland:Trans Tech Publications Ltd,2003; 419-422:57
[6]	Aghion E,Bronfin B,Eliezer D.In:Kojima Y,Aizawa T,Higashi K,Kamado S,eds.,Mater Sci Forum,Switzerland:Trans Tech Publications Ltd,2003; 419-422:407
[7]	Zhang X M,Peng Z K,Chen J M,Deng Y L.Chin J Nonfer Met,2004; 14:1443 (张新明,彭卓凯,陈健美,邓运来.中国有色金属学报,2004;14:1443)
[8]	Luo A A,Pekguleryuz M O.J Mater Sci,1994; 29:5259
[9]	Guo X T,Li P J,Zeng D B,Liu S X.Chin J Nonfer Met,2004; 14:1295 (郭旭涛,李培杰,曾大本,刘树勋.中国有色金属学报,2004;14:1295)
[10]	Wang Q D,Lu Y Z,Zeng X Q,Ding W J,Zhu Y P,Li Q H,Lan J.Mater Sci Eng,1999; A271:109
[11]	Qi Q J,Liu Y B,Yang X H.J Rare Earths,2003; 21:157
[12]	Huang X F,Zhou H,He Z M.J Rare Earths,2003; 21:73
[13]	Sun W C,Zhang S R,Hou A Q.The Behavior of Rare Earth in Aluminum Alloy.Beijing:Weapon Industry Press,1992:231 (孙伟成,张淑荣,侯爱芹.稀土在铝合金中的行为.北京:兵器工业出版社,1992:231)
[14]	Liu Y,Chen W P,Zhang W W,Zhang D T,Li Y Y.J Rare Earths,2004; 22:527
[15]	Zhou H T,Zeng X Q,Liu W F,Ding W J,Zhu Y P.Chin J Nonfer Met,2004; 14:99 (周海涛,曾小勤,刘文法,丁文江,朱燕萍.中国有色金属学报,2004;14:99)
[16]	Yang Z,Li J P,Li G H,Yang J M.In:Ke W,Han E H,Han Y F,Kainer K,Luo A A,eds.,Mater Sci Forum,Switzerland:Trans Tech Publications Ltd,2005; 488-489:219
[17]	He S M,Peng L M,Zeng X Q,Liu L P,Wang Q D,Ding W J,Zhu Y P.In:Ke W,Han E H,Han Y F,Kainer K,Luo A A,eds.,Mater Sci Forum,Switzerland:Trans Tech Publications Ltd,2005; 488-489:231
[18]	Cao P,Qian M,St John D H.Scr Mater,2004; 51:647
[19]	Zhang S C,Wei B K,Cai Q Z,Wang L S.Trans Nonfer Met Soc Chin,2003; 13:83
[20]	Wei L Y,Dunlop G L,Westengen H.Mater Sci Technol,1996; 12:741
[21]	Pettersen G,Westengen H,Hoier R,Lohne O.Mater Sci Eng,1996; A207:115
[22]	Byun J Y,Kwon S I,Doh J M,HaH P.JRare Earths,2004; 22(Suppl.):42
[23]	Cao P,St John D H,Qian M.In:Ke W,Han E H,Han Y F,Kainer K,Luo A A,eds.,Mater Sci Forum,Switzerland:Trans Tech Publications Ltd,2005; 488-489:139
[24]	Zheng W C,Li S S,Tang B,Zeng D B.Chin J Nonfer Met,2006; 16:197 (郑伟超,李双寿,汤彬,曾大本.中国有色金属学报,2006;16:197)
[25]	Yu K,Li W X.Heat Treat Met,2005; 30(4):34 (余琨,黎文献.金属热处理,2005;30(4):34)
[26]	Hu H Q.Principle of Solidification.2nd ed,Beijing:China Machine Press,2000:128 (胡汉起.金属凝固原理.第2版,北京:机械工业出版社,2000:128)
[27]	Nave M D,Dahle A K,St John D H.In:Kaplan H I,Hryn J N,Clow B B,eds.,Magnesium Technology 2000,Warrendale,Pennsylvania:The Minerals,Metals & Materials Society,2000:243
[28]	Ha K F.Micro-theory of Metal Mechanical Properties.Beijing:Science Press,1983:429 (哈宽富.金属力学性质的微观理论.北京:科学出版社,1983:429)

上一张下一张

计量

下载量()
访问量()

作者相关

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网