Superelastic response of low-modulus porous beta-type Ti-35Nb-2Ta-3Zr alloy fabricated by laser powder bed fusion

Abstract

This work investigated the superelastic response of the low-modulus porous β type Ti-35Nb-2Ta-3Zr scaffolds with different pore dimensions fabricated by laser powder bed fusion. The superelastic behavior was enhanced with increasing the pore size and stress-induced phase transformation, which correspondingly led to stress-induced α" [110]-type I twin martensitic transformation and ω formation adjacent to β matrix/twins. The resultant interstitial compound phase structure facilitated the β → α" and β → ω transition, which was triggered by interfacial stress/strain concentration and high-density dislocations. Substantial high-angle grain boundaries (HAGBs) accumulated high-intensity Schimd factor and crystallographic texture after being deformed. Moreover, a lower Young’s modulus was obtained when the pore size and stress increased.

Document Type

Journal Article

Date of Publication

1-1-2020

Publication Title

Additive Manufacturing

Publisher

Elsevier

School

School of Engineering

RAS ID

31553

Comments

Hafeez, N., Liu, J., Wang, L., Wei, D., Tang, Y., Lu, W., & Zhang, L. C. (2020). Superelastic response of low-modulus porous beta-type Ti-35Nb-2Ta-3Zr alloy fabricated by laser powder bed fusion. Additive Manufacturing, 34, Article 101264.

https://doi.org/10.1016/j.addma.2020.101264

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Link to publisher version (DOI)

10.1016/j.addma.2020.101264