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Summer 2008 Seminar
Friday, July 18 at 3:30 p.m., Room 184 Watts Hall
Matthew Brandes
PhD Candidate advised by Drs. Michel Mills
Department of Materials Science and Engineering
The Ohio State University
The Effect of Primary and Secondary Alpha Morphology on the Cold Creep Response of BETA-Processed Ti-6-2-4-2
Abstract
Two-phase titanium alloys containing a majority volume fraction of the α (HCP) phase have long been known to undergo creep deformation at lower temperatures (T < 0.3 Tm) and stress (σ < σys). The time dependence of this plasticity, resulting from <a> slip in the α phase, has been found to be sensitive to microstructural condition. This talk examines the nature of low temperature creep in heat-treatment modified β-annealed Ti-6Al-2Sn-4Zr-2Mo. Primary α lathe and β-rib structure, particularly secondary α morphology and content, were systematically modified and crept under tensile and compressive loading conditions. Creep response is found to obey a power law form where the time exponent varies with microstructural and loading conditions. Variations in plastic response are discussed in terms of strain hardening and strain rate sensitivity parameters measured in single and polycrystalline titanium alloys.
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