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

Document Type

Journal Article

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

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.

DOI

10.1016/j.addma.2020.101264

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