Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 790, Issue -, Pages 117-126Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.03.138
Keywords
Selective laser sintering; Mechanical properties; Transitional omega-formation; Zigzag formation; Twin martensite
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Funding
- National Science Foundation [51674167, 51504152]
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
- Medical Engineering Cross Research Foundation of Shanghai Jiao Tong University [YG2017ZD06]
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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 beta-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 beta-type Ti alloy specimen. The zigzag and V-shaped formation of {112}<111>(beta) twins, coexisting with stress-induced omega-formation, were observed by the transmission electron microscopy (TEM). The formation of Type I twin martensite along with beta-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 beta and omega phases. Thin layers of omega-formation in weak interfacial stress regions along with the longitudinal twin boundaries were also analyzed. The orientation relationship between omega-structure and parent beta-phase involves an overlapping of omega-phase, observed along with longitudinal beta-matrix and beta-twins. Moreover, dislocation tangles and dislocation pile-ups form along with twin martensite, stress-induced omega-phase, and beta-phase. (C) 2019 Elsevier B.V. All rights reserved.
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