Stress change tests during the steady state creep of aluminum alloy 3004 at 300°C

Abstract

Stress change tests during steady state creep have been used to study the creep behaviour of aluminium alloy 3004 (Al-1.01wt.%Mn-0.97wt.%Mg-0.36wt.%Si-0.39wt.%Fe-0.19wt.%Cu) at 300°C and the results compared with those for binary AlMg alloys made from high purity metals. Similarities in the shape of the primary creep curves, instantaneous strains and work-hardening rates are considered to arise because the viscous glide is rate controlling in both alloy 3004 and binary AlMg alloys. Differences in the stress exponents of steady state creep and the internal (back) stresses are considered to be due to the presence of precipitates in alloy 3004.