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Journal of Materials Engineering and Performance

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13-10-2020

Flow Behaviors and Processing Maps of NiTi Shape Memory Alloy with Microstructural Observations on Austenite Phase during Hot Compression

Authors: Chaojun Li, Jiao Luo, Miaoquan Li

Published in: Journal of Materials Engineering and Performance | Issue 10/2020

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Abstract

The flow stress–strain curves, strain rate sensitivity (\( m \)) and processing maps of Ni_50.8Ti_49.2 shape memory alloy were analyzed in the present study. The microstructure of deformed samples at some processing parameters was observed via optical micrograph (OM) and electron backscatter diffraction (EBSD) techniques. The results showed that an early yield reduction phenomenon were observed at the deformation temperatures 800 and 900 °C and strain rates of 1 and 0.1 s⁻¹, and it extended at 600 °C as the strain rate was 0.01 s⁻¹ due to the noticeable softening effect after escaping the pinning site. The maximum \( m \)-value of 0.29 occurred at a deformation temperature of 800 °C due to the occurrence of complete dynamic recrystallization. The instability region of NiTi shape memory alloy increased with increasing strain, in which the austenite grains were obviously elongated and showed an oriented characteristics.

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Title: Flow Behaviors and Processing Maps of NiTi Shape Memory Alloy with Microstructural Observations on Austenite Phase during Hot Compression
Authors: Chaojun Li
Jiao Luo
Miaoquan Li
Publication date: 13-10-2020
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 10/2020
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-020-05182-1

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