Fundamental Studies on High Temperature Deformation, Recrystallization, and Grain Growth of Two-Phase Materials.
Interim technical rept. 1 Sep 85-30 Nov 86,
MARYLAND UNIV COLLEGE PARK DEPT OF CHEMICAL AND NUCLEAR ENGINEERING
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An investigation has been initiated to study the basic factors which control the high temperature deformation, recrystallization, and grain growth of two phase Ti alloys. It was found that the particle growth kinetics of the alpha and beta phases, in titanium alloys, could be represented by simple algebraic equations in terms of time and volume percents of the phases. The observation of the various growth constants in these equations indicated that under identical conditions, the growth of alpha particles in a beta matrix was faster than the growth of beta in an alpha matrix. This was attributed to the higher diffusivities in the beta phase. Furthermore the results of the investigation strongly suggest that one must consider the self diffusivity of the matrix in predicting the growth kinetics, if the self diffusivity is lower than that of the solute. This is in contrast to the present particle coarsening theories which only consider the diffusivity of the solute. It was also found that for identical conditions volume fraction temperature particle sizes of the Titanium Vanaoium systems were slightly smaller diffusivity of vanadium in comparison to the self diffusivity of titanium. The high temperature deformation studies showed that strain softening which occurs in Beta-titanium alloys, can also occur in alpha-beta Ti alloys.
- Properties of Metals and Alloys