J. Mater. Sci. Technol. ›› 2006, Vol. 22 ›› Issue (05): 691-695.

• 论文 • 上一篇    下一篇

Phase Transformation and Thermal Stability of Aged Ti-Ni-Hf High Temperature Shape Memory Alloys

孟祥龙;蔡伟;K.T. Lau;L.M. Zhou;赵连城   

  1. 哈尔滨工业大学材料科学与工程学院
  • 收稿日期:2005-02-12 修回日期:2005-09-26 出版日期:2006-09-28 发布日期:2009-10-10
  • 通讯作者: Xianglong MENG

Phase Transformation and Thermal Stability of Aged Ti-Ni-Hf High Temperature Shape Memory Alloys

Xianglong MENG, Wei CAI, K.T.Lau, L.M.Zhou, Liancheng ZHAO   

  1. School of Materials Science & Engineering, Harbin Institute of Technology, Harbin 150001, China...
  • Received:2005-02-12 Revised:2005-09-26 Online:2006-09-28 Published:2009-10-10
  • Contact: Xianglong MENG

RichHTML

1

PDF (PC)

1166

Abstract: The use of Ni-rich TiNiHf alloys as high temperature shape memory alloys (SMAs) through aging has been presented. For Ni-rich Ti80-xNixHf20 alloys, their phase transformation temperatures are averagely increased more than 100 K by aging at 823 K for 2 h. Especially for the alloys with Ni-content of 50.4 at. pct and 50.6 at. pct, their martensitic transformation start temperatures (Ms) are more than 473 K after aging. TEM observation confirmed that some fine particles precipitate from the matrix during aging. The aged Ni-rich TiNiHf SMAs show the better thermal stability of phase transformation temperatures than the solutiontreated TiNiHf alloys. The fine particles precipitated during aging should be responsible for the increase of phase transformation temperatures and its high stability.

Key words: TiNiHf alloy, High temperature shape memory alloy, Aging, Phase transformation