Analysis of porous NiTi shape memory alloy fabricated by MIM and SHS

作者：Gong, X. W.^*; Zhang, L. X.; Zhang, Y.; Shi, Q.

来源：Optoelectronics and Advanced Materials-Rapid Communications, 2016, 10(1-2): 68-73.

• Metal Injection Molding(MIM)
• Self-propagating High-temperature Synthesis(SHS)
• Porous NiTi alloys
• Shape memory
• Performance analysis
• Scanning Electron Microscope (SEM)
• Differential Scanning Calorimeter (DSC)

In this paper, we study the porous NiTi shape memory alloy (SMA), fabricated by metal injection molding (MIM) and self-propagating high-temperature synthesis (SHS). To analyze the performance of the porous NiTi SMA, we used a scanning electron microscope(SEM), pore diameter distribution, composition, a differential scanning calorimeter(DSC), compression stress-strain curve, and more. The results showed that the porous NiTi alloy fabricated by MIM and SHS had greater porosity, generally more than 60%, with the pores divisible into two types, based on size: big pores, with a diammeter of approximately 1mm, and small pores, with a diameter of approximately 0.1-0.2mm. The NiTi main phases of B2 and B19' and the tiny NiTi2 middle transition phase were found in the porous NiTi shape memory alloy, but Ti and Ni pure element was not found in the product. While there was thermal imbalance in the self-propagating high-temperature synthesis process, it had little influence on the phase transformation point. The maximum compression resistance stress of the sample alloy reached 250MPa, and its extreme compression ratio reached 18%.

• 出版日期2016-2
• 单位浙江海洋大学