期刊
SHAPE MEMORY AND SUPERELASTICITY
卷 4, 期 2, 页码 327-336出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s40830-018-0176-x
关键词
Porous 51%Ni-Ti SMAs; Microwave sintering; Microstructure; Mechanical properties and corrosion; Bioactivity
资金
- Ministry of Higher Education of Malaysia [Q.J130000.2524.12H60]
- Universiti Teknologi Malaysia [Q.J130000.2524.12H60]
The effect of time and temperature on the microwave sintering of 51(at.%)Ni-Ti shape memory alloys (SMAs) was investigated in the current research. Furthermore, the microstructure, mechanical properties, and bio-corrosion properties were analyzed based on the sintering conditions. The results revealed that the sintering condition of 700 degrees C for 15 min produced a part with coherent surface survey that does not exhibit gross defects. Increasing the sintering time and temperature created defects on the outer surface, while reducing the temperature to 550 degrees C severely affected the mechanical properties. The microstructure of these samples showed two regions of Ni-rich region and Ti-rich region between them Ti2Ni, NiTi, and Ni3Ti phases. The differential scanning calorimeter (DSC) curves of Ni-Ti samples exhibited a multi-step phase transformation B19'-R-B2 during heating and cooling. An increase in the sintering temperature from 550 to 700 degrees C was found to increase the fracture strength significantly and decreased the fracture strain slightly. Reducing the sintering temperature from 700 to 550 degrees C severely affected the corrosion behaviors of 51%Ni-Ti SMAs. This research aims to select the optimum parameters to produce Ni-Ti alloys with desired microstructure, mechanical properties, and corrosion behaviors for biomedical applications.
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