Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/24846
Title: Phase transformation and thermal stability of aged Ti-Ni-Hf high temperature shape memory alloys
Authors: Meng, X
Cai, W
Lau, KT 
Zhou, LM 
Zhao, L
Keywords: Aging
High temperature shape memory alloy
Phase transformation
TiNiHf alloy
Issue Date: 2006
Publisher: Elsevier
Source: Journal of materials science & technology, 2006, v. 22, no. 5, p. 691-695 How to cite?
Journal: Journal of materials science & technology 
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 solution-treated TiNiHf alloys. The fine particles precipitated during aging should be responsible for the increase of phase transformation temperatures and its high stability.
URI: http://hdl.handle.net/10397/24846
ISSN: 1005-0302
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