The effect of temperature on slip in microtextured Ti-6Al-2Sn-4Zr-2Mo under dwell fatigue

Slip activity in dwell fatigued Ti-6Al-2Sn-4Zr-2Mo, and its relation to the microstructure, was investigated using digital image correlation and electron backscatter diffraction at room temperature, 120 ?C, and 200 ?C to span a range of dwell sensitivities. The grains through which slip traces traversed were examined to identify critical grain characteristics in the percolation of long-range slip. It was found that slip accumulated more rapidly and in greater amounts at temperatures that exhibit dwell sensitivity (room temperature and 120 ?C) versus temperatures that do not (200 ?C). At all temperatures, plasticity occurred primarily by long-range basal slip through colocated grains with a high basal Schmid factor.

Automated summary

Research found that slip activity in Ti-6Al-2Sn-4Zr-2Mo was more rapid and accumulated more at lower temperatures exhibiting dwell sensitivity, compared to higher temperatures. Plasticity primarily occurred through long-range basal slip in colocated grains with a high basal Schmid factor at all temperatures.