Microstructure and corrosion behavior of NiTi shape memory alloys sintered in the SPS process

C. Velmurugan; V. Senthilkumar; P. S. Kamala

doi:10.1007/s12613-019-1836-3

Volume 26 Issue 10

Oct. 2019

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文章导航 > 矿物冶金与材料学报（英文） > 2019 > 26(10): 1311-1321

C. Velmurugan, V. Senthilkumar, and P. S. Kamala, Microstructure and corrosion behavior of NiTi shape memory alloys sintered in the SPS process, Int. J. Miner. Metall. Mater., 26(2019), No. 10, pp. 1311-1321. https://doi.org/10.1007/s12613-019-1836-3

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C. Velmurugan, V. Senthilkumar, and P. S. Kamala, Microstructure and corrosion behavior of NiTi shape memory alloys sintered in the SPS process, Int. J. Miner. Metall. Mater., 26(2019), No. 10, pp. 1311-1321. https://doi.org/10.1007/s12613-019-1836-3

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Microstructure and corrosion behavior of NiTi shape memory alloys sintered in the SPS process

Department of Production Engineering, National Institute of Technology, Tiruchirappalli 620015, India

中文摘要

NiTi shape memory alloys (SMAs) was developed using the spark-plasma sintering (SPS) process with different average particle size (45 µm and 10 µm) under various temperature. The influence of particle size and temperature on the density, microstructure, and corrosion behavior of the NiTi in simulated body fluid was examined. The porosity decreased with increasing sintering temperature and decreasing particle size, which resulted in an increase in density of the alloy. Increasing the sintering temperature led to the formation of Ni- and Ti-rich intermetallic such as Ni₃Ti and NiTi₂. The formation of these secondary phases influenced the corrosion behavior of NiTi by changing its chemical composition. The planar structure of NiTi was transformed into a dendritic structure at 900℃, which resulted in the formation of uniform oxide and phosphate layers on the entire surface. A high corrosion potential and low corrosion current density were achieved with NiTi prepared with 10 µm particles at 900℃, which exhibited superior corrosion resistance.

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Microstructure and corrosion behavior of NiTi shape memory alloys sintered in the SPS process

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Abstract

Abstract

NiTi shape memory alloys (SMAs) was developed using the spark-plasma sintering (SPS) process with different average particle size (45 µm and 10 µm) under various temperature. The influence of particle size and temperature on the density, microstructure, and corrosion behavior of the NiTi in simulated body fluid was examined. The porosity decreased with increasing sintering temperature and decreasing particle size, which resulted in an increase in density of the alloy. Increasing the sintering temperature led to the formation of Ni- and Ti-rich intermetallic such as Ni₃Ti and NiTi₂. The formation of these secondary phases influenced the corrosion behavior of NiTi by changing its chemical composition. The planar structure of NiTi was transformed into a dendritic structure at 900℃, which resulted in the formation of uniform oxide and phosphate layers on the entire surface. A high corrosion potential and low corrosion current density were achieved with NiTi prepared with 10 µm particles at 900℃, which exhibited superior corrosion resistance.
- shape memory alloys;
- NiTi;
- microstructure;
- corrosion;
- spark-plasma sintering

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Microstructure and corrosion behavior of NiTi shape memory alloys sintered in the SPS process

中文摘要

Microstructure and corrosion behavior of NiTi shape memory alloys sintered in the SPS process

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