Microstructures and mechanical properties of nanocrystalline NiTi intermetallics formed by mechanosynthesis

S. Arunkumar; P. Kumaravel; C. Velmurugan; V. Senthilkumar

doi:10.1007/s12613-018-1549-z

Volume 25 Issue 1

Jan. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(1): 80-87

S. Arunkumar, P. Kumaravel, C. Velmurugan, and V. Senthilkumar, Microstructures and mechanical properties of nanocrystalline NiTi intermetallics formed by mechanosynthesis, Int. J. Miner. Metall. Mater., 25(2018), No. 1, pp. 80-87. https://doi.org/10.1007/s12613-018-1549-z

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S. Arunkumar, P. Kumaravel, C. Velmurugan, and V. Senthilkumar, Microstructures and mechanical properties of nanocrystalline NiTi intermetallics formed by mechanosynthesis, Int. J. Miner. Metall. Mater., 25(2018), No. 1, pp. 80-87. https://doi.org/10.1007/s12613-018-1549-z

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Research Article

Microstructures and mechanical properties of nanocrystalline NiTi intermetallics formed by mechanosynthesis

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Corresponding author:
S. Arunkumar E-mail: shaiarun1978@gmail.com
Received: 31 May 2017; Revised: 9 October 2017; Accepted: 10 October 2017

Abstract

Abstract

The formulation of nanocrystalline NiTi shape memory alloys has potential effects in mechanical stimulation and medical implantology. The present work elucidates the effect of milling time on the product's structural characteristics, chemical composition, and microhardness for NiTi synthesized by mechanical alloying for different milling durations. Increasing the milling duration led to the formation of a nanocrystalline NiTi intermetallic at a higher level. The formation of nanocrystalline materials was directed through cold fusion, fracturing, and the development of a steady state, which were influenced by the accumulation of strain energy. In the morphological study, uninterrupted cold diffusion and fracturing were visualized using transmission electron microscopy. Particle size analysis revealed that the mean particle size was reduced to~93 μm after 20 h of milling. The mechanical strength was enhanced by the formation of a nanocrystalline intermetallic phase at longer milling time, which was confirmed by the results of Vickers hardness analyses.
- nickel-titanium shape memory alloy;
- lattice strain;
- nano-crystalline;
- mechanical alloying;
- microstructural characterization

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