Journal
SCRIPTA MATERIALIA
Volume 57, Issue 11, Pages 1020-1023Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2007.07.043
Keywords
NiTi shape memory alloy; gradient porosity; temporary space-holder; phase transformation; superelasticity
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Porous NiTi alloys with gradient porosity and large pore size were successfully fabricated by using a temporary space-holder (NH4HCO3) and a conventional sintering method. The pore characteristics of the porous alloys can be tailored effectively by changing the amount of NH4HCO3 added, and the use of NH4HCO3 has no influence on the microstructure and phase transformation behavior of the porous alloys. The fabricated samples with radial gradient porosity exhibit excellent superelasticity (higher than 4%). (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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