抄録
Influence of Mg content, grain size, 0.2% proof stress, and alloying elements (such as Zn, Mn, Cu, Y) on the ductility of Al-Mg alloys have been investigated, and controlling factors have been revealed. The uniform elongation is expressed by εu=n(1-σo/σi) where n is the strain hardening exponent, σi the true ultimate tensile strength, σo the 0.2% proof stress, and εu the uniform elongation. The strain hardening exponent n increases as the Mg content increases, which depends on the increasing difficulties of the cross slip of dislocations. The 0.2% proof stress σo decreases as the grain size increases, which increases the uniform elongation εu.
