Microstructure and tensile properties of a Ti-28Ta alloy studied by transmission electron microscopy and digital image correlation. (June 2019)

• Record Type: Journal Article
• Authors: Chen, Gang; Yin, Jingou; Zhao, Shaoyang; Tang, Huiping; Qu, Xuanhui
• Is Part Of: International journal of refractory metals & hard materials. Volume 81(2019)
• Page Start: 71
• Page End: 77
• Publication Date: 2019-06
• Subjects: Superelasticity -- Martensitic phase transformation -- Tension -- Transmission electron microscopy -- Digital image correlation; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2019.02.020
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: This work presents a study of tensile behavior for a Ti-28 at.%Ta alloy with low modulus and remarkable superelasticity. The Ti-28Ta alloy was firstly fabricated by melting the Ti/Ta powder mixture, followed by hot swaging. The microstructure and tensile behavior were examined by X-ray diffraction, optical microscopy, scanning electron microscopy, transmission electron microscopy and digital image correlation. The results show that the as-fabricated Ti-28Ta alloy is consisted of β with minor nano-sized martensitic α″ and athermal ω. The yield strength and tensile strength of the Ti-28Ta alloy are 549.4 ± 17.0 and 673.8 ± 78.2 MPa, while its fracture elongation and Young's modulus reach to 28.55 ± 2.19% and 89.9 ± 6.1 GPa, respectively. The static and cyclic stress–strain tensile behaviors of the Ti-28Ta alloy were investigated. The results demonstrate that the Ti-28Ta alloy exhibits ductile and transgranular fracture behavior, excellent superelasticity and remarkable ductility. Highlights: The Ti-28Ta alloy achieves excellent superelasticity and remarkable ductility. The fractured Ti-28Ta alloy shows a typical ductile-and-transgranular feature. Sub-macro patterns and stress hysteresis of Ti-28Ta during tension were studied.