Effect of heat treatment condition on elongation of H1n-tempered Al–Mn alloy with layered structure

Abstract

The effect of heat treatment condition on elongation of H1n-tempered Al–Mn alloy with layered structure has been investigated. Uniform elongation and local elongation were measured respectively. The work hardening exponent (n value) increased with decreasing size and increasing density of dispersoid, and thus uniform elongation was improved. On the other hand, local elongation increased with refinement and homogenization of dislocation structure. It is considered that strain rate sensitivity exponent (m value) increases as dislocation structure becomes finer and more homogeneous, and thus localization of necking was inhibited and relatively homogeneous deformation continued up to higher strain.