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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 1    February 2006

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Effects of heat treatment on characteristics of porous
Ni-rich NiTi SMA prepared by SHS technique
CHU Cheng-lin(储成林)1, CHUNG Jonathan-CY(钟志源)2, CHU Paul-K(朱剑豪)2

1. Department of Materials Science and Engineering, Southeast University, Nanjing 210096, China;
2. Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China

Abstract:The effects of heat treatment on the microstructure and compressive properties of porous Ni-rich NiTi shape memory alloy (SMA) fabricated by self-propagating high-temperature synthesis (SHS) were investigated. The solution treatment at 1050℃ has little effects on stable Ti2Ni second phase, however, it decreases the amount of Ni4Ti3 phase derived from the SHS process and results in the improvement of the ductility of porous NiTi SMA. The subsequent aging treatment after solution treatment could lead to the precipitation of the discrete Ni4Ti3 phase in NiTi matrix grains, which increases the brittleness of porous NiTi SMA. Porous NiTi SMA presents a composite fracture behavior consisting of a ductile fracture of NiTi matrix and a cleavage fracture of second phase particles. Many cracks existing on the interfaces indicate that the bonding of the matrix with second phase particles is weak.

 

Key words: NiTi shape memory alloy; porous material; self-propagating high-temperature synthesis; microstructure; compressive properties

ISSN 1672-7029
CN 43-1423/U

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