Effect of Deformation-Induced Plasticity in Low-Alloyed Al-Mg-Zr Alloy Processed by High-Pressure Torsion

The influence of additional deformation heat treatments (DHTs), implemented by two regimes: (1) annealing and small high-pressure torsion (HPT) at room temperature (RT) (2) HPT elevated to 10 turns RT, has been studied on the microstructure, mechanical properties electrical conductivity ultrafine-grained (UFG) Al-0.53Mg-0.27Zr (wt.%) alloy structured RT. As is shown, both types DHT lead a substantial increase in plasticity (2–5 times) while maintaining high (~53% IACS) strength comprising 75–85% value pre-DHT state UFG alloy. possible physical reasons for revealed changes are analyzed. Comparison with microstructure evolution after indicates that density introduced grain boundary dislocations most probable factor providing tremendous level under study. An outstanding combination (370 MPa), elongation failure (~15%) significant was achieved Al-Mg-Zr This exceeds those obtained date this system, as well number other commercial conductor alloys based Al-Zr system.