Dispersion Hardening Effect of Dispersoids in 3xxx Al Alloys With Varying Manganese and Silicon Contents

摘要

For non-heat treatable wrought aluminium alloys the strengthening occurs from solid solution hardening and work hardening. The goal of this paper is to study the dispersion hardening effect of dispersoids precipitated during low temperature annealing. The size, number density and morphology of dispersoids in four selected AA3xxx aluminium alloys with different Si and Mn contents after annealing at different temperatures and for different times are quantitatively studied. The microstructure is correlated with the strength in terms of micro hardness. It is revealed that the dispersoids have a remarkable contribution to the strength of the alloys. The hardening effect of dispersoids increases with increasing Mn and Si content in the alloys.