Steven M. Tuominen
Published: 1975
Total Pages: 25
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The temperature dependence of the flow stress behavior has been measured from 77 to 740 K for age-hardenable beta-phase (bcc) Ti-40V-1Si alloy single crystals. For solution-treated and aged crystals, an increase in the athermal yield stress at 740 K is accompanied by a decrease in the temperature dependence of the yield stress. Direct electron microscopy observations, slip character, and work hardening behavior indicate that the precipitate particles are predominantly sheared in the conditions tested. It is suggested that the reduced temperature dependence of the yield stress with aging results from: (a) the relative flow stress difference of screw vs. edge dislocations moving through penetrable obstacles and (b) solute association which may occur during aging.