Title

Mechanical behavior and phase transformation of β-type Ti-35Nb-2Ta-3Zr alloy fabricated by 3D-Printing

Document Type

Journal Article

Publication Title

Journal of Alloys and Compounds

Publisher

Elsevier Ltd

School

School of Engineering

RAS ID

28409

Comments

Hafeez, N., Liu, S., Lu, E., Wang, L., Liu, R., lu, W., & Zhang, L. -. (2019). Mechanical behavior and phase transformation of β-type ti-35Nb-2Ta-3Zr alloy fabricated by 3D-printing. Journal of Alloys and Compounds, 117-126. Available here

Abstract

Additive manufacturing (AM) has a substantial capability to produce superior and divergent properties of titanium alloys for biomedical implants, unlike the existing conventional technologies. This work investigated the mechanical properties and microstructure evolution of a β-type Ti-35Nb-2Ta-3Zr alloy prepared by selective laser sintering (SLS) process. The superelastic properties of the resultant specimen were characterized by cyclic loading-unloading tensile testing to evaluate the effect of SLS-process on the β-type Ti alloy specimen. The zigzag and V-shaped formation of {112} β twins, coexisting with stress-induced ω-formation, were observed by the transmission electron microscopy (TEM). The formation of Type I twin martensite along with β-structure is attributed to superelastic recovery and elastic recovery of SLS-produced specimen. High resolution TEM (HRTEM) observation was used to investigate the transition between β and ω phases. Thin layers of ω-formation in weak interfacial stress regions along with the longitudinal twin boundaries were also analyzed. The orientation relationship between ω-structure and parent β-phase involves an overlapping of ω-phase, observed along with longitudinal β-matrix and β-twins. Moreover, dislocation tangles and dislocation pile-ups form along with twin martensite, stress-induced ω-phase, and β-phase. © 2019 Elsevier B.V.

DOI

10.1016/j.jallcom.2019.03.138

Share

 
COinS