Abstract
The effects of temperature and strain rate on elongation of Al–4.5Mg alloy were investigated at 10−4–10−2 s−1 and at 573–773 K . The elongation depended on the temperature and strain rate even in the solute-drag creep region; as a result, a large elongation of 352% was attained at 653 K and at 10−3 s−1. Necking developed due to a decrease in plastic stability arising from apparent strain softening behavior at 10−2 s−1 at 653 K or the low strain rate sensitivity at 10−3 s−1 at 573 K . Also, significant cavitation was caused due to grain boundary sliding at 10−4 s−1 at 653 K and at 10−3 s−1 at 773 K . The development of necking and cavitation is responsible for the temperature and strain rate dependence of elongation.
