Grain growth behaviour of the Al-Cu eutectic alloy during superplastic deformation

TLDR: Grain growth behavior of the Al-Cu eutectic alloy was investigated as a function of strain (e), strain rate and deformation temperature (T) over as discussed by the authors, where grain size increases with increase in strain and temperature.

Abstract: Grain growth behaviour of the Al-Cu eutectic alloy was investigated as a function of strain (e), strain rate $$(\dot \varepsilon )$$ and deformation temperature (T) over $$\dot \varepsilon $$ = 10−2 s−1 and T=400 to 540°C The grain size increases with increase in strain and temperature Upon deformation to a fixed strain, the grain growth is generally seen to be more at lower strain rates The rates of overall grain growth $$(\dot d_{\varepsilon ,t} )$$ and due to deformation alone $$(\dot d_\varepsilon )$$ , however, increase with increasing strain rate according to $$\dot d_{\varepsilon ,t} \propto \dot \varepsilon ^{086} $$ and $$\dot d_{\varepsilon ,t} \propto \dot \varepsilon ^{064} $$ , respectively The increase in the grain growth rate with strain rate is attributed primarily to the shorter time involved at higher strain rate for reaching a fixed strain The activation energy for grain growth under superplastic conditions is estimated to be 79 kJ mol−1