Static grain growth in a microduplex Ti-6Al-4V alloy
Department or Administrative Unit
Engineering Technologies, Safety, and Construction
The grain growth behavior of the microduplex titanium, 6% aluminum, 4% vanadium alloy is addressed. Although there has been considerable work done on second phase particle coarsening, there is limited research on coarsening in a two-phase material with nearly equal phase ratios. In this study, coarsening parameters were determined for the temperature range of 850–925°C, where α and β phase ratios are approximately 50 percent. Experimentally determined grain growth data for the Ti alloy are found to follow classical particle-stabilized grain growth kinetics with a temperature dependent coefficient and a constant exponent. On the basis of these observations a grain boundary pipe diffusion model is proposed which has the desired features of incorporating both the faster kinetics of the grain boundary diffusion and the unidirectional exponent q=5, which is often observed in microduplex alloys. The model appears to resolve a previously reported dilemma that the time exponent suggests pipe diffusion but the kinetics associated with the triple boundary is too slow. The concept proposed should have applicability to other two-phase alloys containing approximately equal volume fractions of each phase.
Johnson, C. H., Richter, S. K., Hamilton, C. H., & Hoyt, J. J. (1998). Static grain growth in a microduplex Ti–6Al–4V alloy. Acta Materialia, 47(1), 23–29. https://doi.org/10.1016/s1359-6454(98)00341-3
Copyright © 1998 Acta Metallurgica Inc.