Cold workability and shape memory properties of novel Ti-Ni-Hf-Nb high-temperature shape memory alloys

초록

The effect of Nb content on the cold workability, microstructure and shape memory properties of Ti-Ni-Hf-Nb alloys is investigated. The addition of Nb to Ti-Ni-Hf improves the cold workability due to the formation of a soft Nb-rich phase. The Ti-Ni-Hf Nb alloys exhibit a high-temperature shape memory effect during heating and cooling cycles under various stress levels. As the Nb content increases, the shape memory properties of the Ti-Ni-Hf-Nb alloys become more stable although the shape recovery strain decreases. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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