研究了Gd的添加对AZ21基体合金高温(200 ℃)力学性能和抗蠕变性能的影响. 结果表明: AZ21-xGd合金由α-Mg和Al2Gd两相组成, 中间相Al2Gd使合金高温拉伸性能和抗蠕变性能得到显著提高, 但降低了合金的延伸率. 在Gd添加量为2%(质量分数)时, 200 ℃下合金的抗拉强度和屈服强度分别达到148和90 MPa, 但随着Gd含量的增加, 高温拉伸强度有所下降;当Gd添加量为3.5%时, 在200 ℃/50 MPa蠕变条件下, 合金70 h的蠕变量为1.2%, 第二阶段蠕变率比AZ21基体合金下降了1个数量级. 晶界上的Al2Gd中间相数量逐渐增多是提高合金的抗蠕变性能的主要原因, 但在晶界上过多的Al2Gd中间相不利于提高合金的高温强度.
参考文献
| [1] | Mordike B L;Ebert T .Magnesium properties application potential[J].Materials Science and Engineering A,2001,302:37. |
| [2] | YUAN Guang-yin,SUN Yang-shan,ZHANG Wei-min,SUN Jian-rong.Tensile and creep properties of Mg-9Al based alloys containing bismuth[J].中国有色金属学会会刊,2000(04):469. |
| [3] | Carbonneau Y;Couture A;Neste Van;Tremblay R .On the observation of a new ternary MgSiCa phase in Mg-Si Alloys[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1998,29A:1759. |
| [4] | Kainer K V.Magnesium alloys and their applications[M].Munich:DGM,2000:14. |
| [5] | Kaplan H;Hryn J;Clow B.Magnesium Technology 2000[M].Nashville:TMS,2000:279. |
| [6] | 薛山,孙扬善,朱天柏,强力峰,陶立,白晶.二元稀土镁合金Mg-La和Mg-Nd的组织和性能[J].铸造,2005(09):888-891. |
| [7] | Anyanwu I A;Kamado S;Kojima Y .Creep properties of Mg-Gd-Y-Zr alloys[J].Materials Transactions,2001,42(01):1212. |
| [8] | Luo Alan A .Recent magnesium alloy development for automotive power train application[J].Materials Science Forum,2003,57(01):419-422. |
| [9] | 张新明,陈健美,邓运来,肖阳,蒋浩.Mg-Gd-Y-Zr耐热镁合金的压缩变形行为[J].中国有色金属学报,2005(12):1925-1932. |
| [10] | 靳广永,吴玉峰,李建辉,杜文博.Gd对Mg-2Al-Zn合金微观组织及力学性能的影响[J].特种铸造及有色合金,2007(08):642-644. |
| [11] | 黄晓锋,王渠东,曾小勤,袁广银,朱燕萍,丁文江.稀土对AM50力学性能及高温蠕变的影响[J].中国稀土学报,2004(04):493-496. |
| [12] | Huang X F;Zhou H;He Zm .Structure analysis of oxidation film of ignition-inhibition on AZ91D magnesium alloy added with cerium[J].Rare Earths,2003,21(01):73. |
| [13] | Lu Yizhen;Wang Qudong;Zeng Xiaoqin;Ding Wenjiang Zhai chuanquan Zhu Yanping .Effect of rare earths on microstructure properties and fracture behavior of Mg-Al alloy[J].Materials Science and Engineering,1999,A278:66. |
| [14] | 刘海峰,侯骏,刘耀辉,佟国栋,孟嬴,刘文辉.压铸镁合金高温蠕变研究现状及进展[J].铸造,2002(06):330-335. |
| [15] | Mullner P;Romanov A E .Internal twinning in deformation twinning[J].Acta Materials,2000,48(04):2323. |
| [16] | Kim J J;Kim K H;Shin K S;Kim N J .Modification of Mg2Si morphology in squeeze cast Mg-Al-Zn-Si alloys by Ca or P addition[J].Scripta Materialia,1999,41(03):333. |
| [17] | Thaddeus B;Massalski.Binary Alloy Phase Diagrams[M].USA,1986:114. |
| [18] | 孙丰泉,严有为.抗蠕变耐热镁合金的研究进展[J].铸造设备研究,2004(03):17-18,28. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%