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

X. W. GONG1,* , X. ZHANG2, Y. ZHANG1, Q. SHI1

Affiliation

  1. School of Naval Architecture and Ocean Engineering, Zhejiang Ocean University, Zhoushan, Zhejiang, 316022, P.R. China
  2. Research Institu te of Baosteel , Baosteel Group , Shanghai, 200122, P.R. China

Abstract

In this paper, we study the porous NiTi shape memory alloy (SMA) fabricated by m etal i njection m olding (MIM) and s elf propagating h igh temperature s ynthesis (SHS). To analyze the performance of the porous NiTi SMA, we used a s canning e lectron m icroscope(SEM), p ore d iameter d istribution, c omposition, a differential scanning calorimeter(DSC), c ompression s tress s train c urve , and The results showed that the porous NiTi alloy fabricated by M IM and SHS had greater porosity, generally more than 60%60%, with the pores divisible into two types, based on size: big pore s, with a diammeter of approximately 1mm , and small pore s, with a diameter of approximately 0.1 0.2mm. The NiTi main phase s of B2 and B19´ and the tiny NiTi 2 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 t hermal imbalance in the self propagating high temperature synthesis process, it had little influence on the phase transformation point. The m aximum compression resistance stress of the sample alloy reached 250MPa, and its extreme compression ratio reached 18%..

Keywords

Metal Injecti on Molding ( MIM), Self propagating High temperature Synthesis SHS )), Porous NiTi alloys, Sape memory, Performance analysis, Scanning Electron Microscope SEM )), Differential Scanning Calorimeter (DSC).

Citation

X. W. GONG, X. ZHANG, Y. ZHANG, Q. SHI, Analysis of porous NiTi shape memory alloy fabricated by MIM and SHS, Optoelectronics and Advanced Materials - Rapid Communications, 10, 1-2, January-February 2016, pp.68-73 (2016).

Submitted at: Aug. 3, 2014

Accepted at: Feb. 10, 2016