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

材料科学技术（英文）, 2006, 22(5): 691-695.

^1, , ^2, , ^3, , ^4, , ^5,

1.School of Materials Science & Engineering,Harbin Institute of Technology,Harbin 150001,China Hong Kong,China

2.School of Materials Science & Engineering,Harbin Institute of Technology,Harbin 150001,China Hong Kong,China

3.Department of Mechanical Engineering,The Hong Kong Polytechnic University,Hung Hom,Kowloon,,Hong Kong,China

4.Department of Mechanical Engineering,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong,China

5.School of Materials Science & Engineering,Harbin Institute of Technology,Harbin 150001,China Hong Kong,China

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

Keywords： TiNiHf alloy

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.

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

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