Abstract
Hard oriented PST crystals of a Ti-48 mol%Al alloy, in which lamellar boundaries are aligned parallel or perpendicular to stress axis, were creep tested. PST crystals of different α 2 spacing were used: one has the equilibrium amount of α 2 phase and the other contains an excess amount. Activation energy for creep rate of the former is 350 kJ/mol, being close to that of self-diffusion. The other crystal having fine α 2 spacing provides lower creep rate due to its more significant strain hardening in the primary creep stage. This crystal shows substantially high activation energy of 510 kJ/mol. The superior creep resistance of the fine α 2 spacing and its high activation energy is discussed in conjunction with the characteristics and degradation of lamellar structure in the material having the fine initial α 2 spacing.
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