期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 18, 页码 6006-6011出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.04.040
关键词
Porous NiTi; Shape memory alloys; Microwave sintering; Microstructure; Phase transformation
类别
资金
- Research Committee of the Hong Kong Polytechnic University [G-YH62]
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 degrees 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 mu m 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 degrees C. (C) 2011 Elsevier B.V. All rights reserved.
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