Tension Twinning Activity in As-Extruded ATZ632 Alloy During Friction and Wear Processes

A detailed statistical analysis is performed using electron back scatter diffraction (EBSD) to establish the relationship between microstructure and wear performance in as-extruded ATZ632 alloy after friction and wear processes. In addition, the selection mechanism of twins under friction and wear conditions is also analyzed. The twins appearing under different loads were all {10 \(\stackrel{\mathrm{-}}{1}\) 2} tensile twins and recrystallization occurred at 120 N, resulting in a decrease in the friction coefficient with increasing load. The Schmidt factor (SF) was calculated using the resultant force of normal load and friction force. The results showed that the proportion of twins with negative SF increased with increasing load, all the twin variants were produced and the (01 \(\stackrel{\mathrm{-}}{1}\) 2)[0 \(\stackrel{\mathrm{-}}{1}\) 11] variant was dominant. The larger the grain size, the higher the SF of the basal slip, and the smaller the misorientation of the grains, which are easier to generate twins in the friction and wear processes. The misorientation of the twinned grains tended to be more random as the load increased.