1. During deformation at a constant temperature above 0.5Tm, there is a steady-state regime where both stress and strain rate remain constant independent of strain. 2. The interdependence of stress, strain rate and temperature during steady-state hot working and secondary creep are similar. 3. During the hardening stage, simultaneous dynamic recovery causes the dislocations to arrange into sub-boundaries. 4. During the steady state, the balance between hardening and recovery maintains the dislocation density constant as subgrains of constant size and misorientation. 5. The subgrains remain equiaxed, indicating that the sub-boundaries continuously break up and reform. It is proposed that this process inhibits recrystallization during high strain-rate deformation. 6. The size of the subgrains and the neatness of their boundaries increase as the temperature increases and the strain rate decreases.