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Microstructure evolution and superelasticity of layer-like NiTiNb porous metal prepared by eutectic reaction

Version 2 2024-06-06, 12:08
Version 1 2018-07-12, 16:11
journal contribution
posted on 2024-06-06, 12:08 authored by L Wang, L Xie, LC Zhang, L Chen, Z Ding, Y Lv, W Zhang, W Lu, D Zhang
This work combines several techniques into a novel method to manufacture NiTi–Nb layer-like porous structures with 3D interconnected channels, which are of vital importance in the biomedical field. NiTi wires and Nb foils are used herein to prepare NiTi–Nb layer-like porous materials via in situ eutectic reaction. Microstructure, phase transformation and superelasticity of the resultant NiTi–Nb layer-like porous material are analyzed and discussed, and the interface between NiTi wires and the solidified NiTi–Nb eutectic region are also studied. Dislocations and stacking faults occurring at interfaces accelerate the eutectic phase transformation. Meanwhile, rod-like eutectic phase pins the motion of screw dislocations, which is beneficial for stress-induced R martensite nucleation. It is believed that much more superelastic recovery and elastic recovery for such a layer-like porous structure are attributed to formation of more martensites during deformation. Furthermore, both reorientation and subsequent de-twinning of <011> type II twins result in the observed stress-plateau, thereby promoting the superelastic recovery.

History

Journal

Acta materialia

Volume

143

Pagination

214-226

Location

Amsterdam, The Netherlands

ISSN

1359-6454

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2017, Acta Materialia Inc.

Publisher

Elsevier