Superelastic behavior of in-situ eutectic-reaction manufactured high strength 3D porous NiTi-Nb scaffold

Document Type

Journal Article

Publication Title

Scripta Materialia

Publisher

Elsevier

School

School of Engineering

RAS ID

30899

Comments

Liu, S., Liu, J., Wang, L., Ma, R. L. W., Zhong, Y., Lu, W., & Zhang, L. C. (2020). Superelastic behavior of in-situ eutectic-reaction manufactured high strength 3D porous NiTi-Nb scaffold. Scripta Materialia, 181, 121-126. https://doi.org/10.1016/j.scriptamat.2020.02.025

Abstract

NiTi-Nb porous shape memory scaffold was in-situ sintered by eutectic reaction using NiTi powder, Nb powder and Ti wire at 1180 °C. Ti2Ni and Ni4Ti3 phases are precipitated between the eutectic region and Ti wire, while the R martensite phase and Nb-Rich phases are formed in both eutectic region and the pre-eutectic region. Moreover, the stacking faults and micro-twinning in the eutectic region are beneficial to nucleation of R-phase martensite. All results demonstrate that the eutectic reaction combined with the interaction of Ti wire, NiTi powder and Nb powder contribute to tremendous increase in compressive strength up to 350 MPa.

DOI

10.1016/j.scriptamat.2020.02.025

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