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Metals 2017, 7(6), 208; doi:10.3390/met7060208

Investigation of Dynamic Recrystallization of NiTi Shape Memory Alloy Subjected to Local Canning Compression

1
College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China
2
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Takuo Sakon
Received: 28 April 2017 / Revised: 24 May 2017 / Accepted: 1 June 2017 / Published: 6 June 2017
(This article belongs to the Special Issue Shape Memory Alloys 2017)
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Abstract

Physical mechanism for dynamic recrystallization of NiTi shape memory alloy subjected to local canning compression at various temperatures, 600, 700 and 800 °C, was investigated via electron backscattered diffraction experiments and transmission electron microscopy observations. With increasing deformation temperature, fractions of recrystallized grains and substructures increase, whereas fraction of deformed grains decreases. In the case of 600 and 700 °C, continuous dynamic recrystallization and discontinuous dynamic recrystallization coexist in NiTi shape memory alloy. In the case of discontinuous dynamic recrystallization, the recrystallized grains are found to be nucleated at grain boundaries and even in grain interior. The pile-up of statistically stored dislocation lays the foundation for the nucleation of the recrystallized grains during discontinuous dynamic recrystallization of NiTi shape memory alloy. Geometrically necessary dislocation plays as an important role in the formation of new recrystallized grains during continuous dynamic recrystallization of NiTi shape memory alloy. View Full-Text
Keywords: shape memory alloy; NiTi alloy; plastic deformation; dynamic recrystallization; microstructure shape memory alloy; NiTi alloy; plastic deformation; dynamic recrystallization; microstructure
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Zhang, Y.; Jiang, S.; Hu, L. Investigation of Dynamic Recrystallization of NiTi Shape Memory Alloy Subjected to Local Canning Compression. Metals 2017, 7, 208.

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