|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Hume-Rothery Award Symposium: Alloy Phase Chemistry at the Atomic Level - Opportunities and Challenges
||Thermally Induced Phase Transformations in Beta-titanium Alloys and Corresponding Effects on Mechanical Properties
||James Coakley, Anna Radecka, Paul Bagot, David Dye, Howard Stone, Dieter Isheim, David Seidman
|On-Site Speaker (Planned)
With appropriate alloying and processing, the beta-titanium alloys possess remarkable mechanical properties that include very high strength-to-weight ratios arising from nanoscale alpha precipitate strengthening, and superelasticity due to a stress induced phase transformation in the elastic loading regime. It is necessary to study the thermal stability of this alloy system to broaden their applications in industry. This study correlates an increase in micro-hardness of Ti-5Al-5Mo-5V-3Cr wt.% during thermal exposure to nanoscale precipitation of isothermal omega phase and subsequent alpha phase, identified by TEM, atom-probe tomography (APT), and in-situ small angle neutron scattering (SANS). Furthermore, a loss of superelasticity and an increase in brittleness is identified during thermal exposure of Ti-24Nb-4Zr-8Sn wt.%, associated with a decrease in the number density of Nb-rich nanoscale embryos and precipitation of isothermal omega phase, respectively, identified by APT and TEM.
||Planned: Supplemental Proceedings volume