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- Title
INFLUENCE OF POROSITY ON SHAPE MEMORY BEHAVIOR OF POROUS SHAPE MEMORY ALLOY.
- Authors
XIONG, JIANYU; LI, YUNCANG; HODGSON, PETER D.; WEN, CUI'E
- Abstract
Porous -50.5at.% 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 alloy were determined by X-ray diffraction (XRD). The shape memory behavior of the porous alloy was investigated using loading-unloading compression tests. Results indicate that the porous 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 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 alloy samples cause stress/strain concentration, as well as crack initiation, which adversely affect the shape memory behavior of the porous alloy.
- Publication
Functional Materials Letters, 2008, Vol 1, Issue 3, p215
- ISSN
1793-6047
- Publication type
Article
- DOI
10.1142/S1793604708000332