采用扫描电镜和X射线衍射方法研究了添加微量Dy元素(0～0.1％(质量分数))对Ni-44Ti-6Al合金微观组织的影响,并采用力学压缩实验研究了合金的室温和高温力学性能.结果表明,Dy元素在Ni-44Ti-6Al合金中的NiTi基体相中固溶,但其固溶度仅为0.03％(原子分数),同时使晶粒细化.超量的Dy以氧化物的形式析出,大部分呈颗粒状分布在晶界.适量的Dy能够有效提高合金的室温屈服强度和塑性.添加0.05％Dy的合金的屈服强度和塑性变形率均达到最大值,分别为1570 MPa和10.9％；Dy含量继续增加,合金的屈服强度和塑性变形率有所下降.Dy能够显著提高合金在600 ～800℃下的屈服强度,添加0.05％Dy合金的屈服强度最高.Dy对合金力学性能的改善主要归因于晶粒细化和固溶强化作用.
参考文献
| [1] | J. Jung;G. Ghosh;G. B. Olson .A comparative study of precipitation behavior of Heusler phase (Ni_2TiAl) from B2-TiNi in Ni-Ti-Al and Ni-Ti-Al-X (X = Hf, Pd, Pt, Zr) alloys[J].Acta materialia,2003(20):6341-6357. |
| [2] | Song, X.;Li, Y.;Li, S. .Effect of Ni/Ti ratio on the microstructure and mechanical properties of Mo-doped nitial intermetallics[J].International Journal of Modern Physics, B. Condensed Matter Physics, Statistical Physics, Applied Physics,2010(15/16):2694-2699. |
| [3] | 徐舰,赵新青,宫声凯,徐惠彬.Nb对TiNiAl合金高温氧化行为的影响[J].金属学报,2006(08):820-826. |
| [4] | Xinqing Zhao;Jian Xu;Liang Tang .High temperature oxidation behavior of NiTiNb intermetallic alloys[J].Intermetallics,2007(8):1105-1115. |
| [5] | 杨春雷,郑立静,李岩,周磊,张虎.抽拉速率对定向凝固Ni-45Ti-5Al合金微观组织的影响[J].中国有色金属学报,2011(11):2763-2768. |
| [6] | 王淑荷,郭建亭,赖万慧,谭明晖,李辉,殷为民.微量Y对铸造Ni50Al20Fe30合金组织与性能的影响[J].材料工程,1999(07):43-46. |
| [7] | A.L. Liu;Z.Y. Gao;L. Gao .Effect of Dy addition on the microstructure and martensitic transformation of a Ni-rich TiNi shape memory alloy[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2007(1/2):339-343. |
| [8] | Liu AL;Sui JH;Lei YC;Cai W;Gao ZY;Zhao LC .Effect of Y addition on microstructure and martensitic transformation of a Ni-rich Ti-Ni shape memory alloy[J].Journal of Materials Science,2007(14):5791-5794. |
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