Influence of porosity on shape memory behavior of porous TiNi shape memory alloy

Xiong, Jianyu, Li, Yuncang, Hodgson, Peter D. and Wen, Cui'e 2008, Influence of porosity on shape memory behavior of porous TiNi shape memory alloy, Functional materials letters (FML), vol. 1, no. 3, pp. 215-219, doi: 10.1142/S1793604708000332.

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Title Influence of porosity on shape memory behavior of porous TiNi shape memory alloy
Author(s) Xiong, Jianyu
Li, Yuncang
Hodgson, Peter D.
Wen, Cui'e
Journal name Functional materials letters (FML)
Volume number 1
Issue number 3
Start page 215
End page 219
Total pages 5
Publisher World Scientific Publishing Co
Place of publication Singapore
Publication date 2008
ISSN 1793-6047
Keyword(s) TiNi; porous alloy
shape memory behavior
spacer sintering
Summary Porous Ti-50.5at.%Ni shape memory alloy (SMA) samples with a range of  porosities were prepared by spacer sintering. The porous structure of the alloy was examined using scanning electron microscopy (SEM). The phase constituents of the porous TiNi alloy were determined by X-ray diffraction (XRD). The shape memory behavior of the porous TiNi alloy was investigated using loading–unloading compression tests. Results indicate that the porous TiNi alloy exhibits superelasticity and the recoverable strain by the superelasticity decreases with the increase of porosity. After a prestrain of 7%, the superelastically recovered strains for the porous TiNi alloy samples with porosities of 46%, 59%, 69% and 77% are 2.0%, 1.8%, 1.5% and 1.3%, respectively. The pores in the TiNi alloy samples cause stress/strain concentration, as well as crack initiation, which adversely affect the shape memory behavior of the porous TiNi alloy.
Language eng
DOI 10.1142/S1793604708000332
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2008, World Scientific Publishing
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Collections: Centre for Material and Fibre Innovation
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