Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8023
Title: Fabrication and characteristics of porous NiTi shape memory alloy synthesized by microwave sintering
Authors: Tang, CY 
Zhang, LN
Wong, CT
Chan, KC 
Yue, TM 
Keywords: Microstructure
Microwave sintering
Phase transformation
Porous NiTi
Shape memory alloys
Issue Date: 2011
Publisher: Elsevier
Source: Materials science and engineering. A, Structural materials : properties, microstructure and processing, 2011, v. 528, no. 18, p. 6006-6011 How to cite?
Journal: Materials science and engineering. A, Structural materials : properties, microstructure and processing 
Abstract: Porous nickel titanium (NiTi) shape memory alloy (SMA) was successfully fabricated by microwave sintering method. This method allows formation of porous structures without using any pore-forming agents. Moreover, microwave sintering of NiTi SMA can be successfully performed at a relatively low sintering temperature of 850 °C and a short sintering time of 15. min. The pore characteristics, microstructure, phase transformation and stress-strain behavior of the porous NiTi SMA were investigated. The porous NiTi SMA exhibited porosity ratios from 27% to 48% and pore sizes range from 50 to 200 μm when using different sintering temperatures and holding times. The predominant B2 (NiTi) and B19′ (NiTi) phases were identified in the porous NiTi SMA. A multi-step phase transformation took place on heating and a two-step phase transformation took place on cooling of the porous NiTi SMA. The irrecoverable strains decreased with increasing sintering temperature, but the holding time had little effect on the stress-strain behavior at 60 °C.
URI: http://hdl.handle.net/10397/8023
ISSN: 0921-5093
EISSN: 1873-4936
DOI: 10.1016/j.msea.2011.04.040
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