Tensile behavior of Al−4%Mg−0.4%Sc−0.5% misch metal alloy at room temperature

Abstract

The effects of strain rate and pre-deformation in Al-4 wt.%Mg-0.4 wt.%Sc-0.5 wt.%Mm (misch metal) alloy on tensile behavior and P-L effect have been investigated. Pre-deformation of Al-4 wt.%Mg-0.4 wt.%Sc-0.5 wt.%Mm alloy clearly enhances the yield strength and ultimate strength, though it decreases the fracture strain. The yield strength of pre-deformed Al-4 wt.%Mg-0.4 wt.%Sc-0.5 wt.%Mm alloy is higher than that of commercially used Al-Mg based alloys. The strength of Al-4 wt.%Mg-0.4 wt.%Sc-0.5 wt.%Mm alloy was changed slightly at a strain rate between 2×10 5 s 1 and 2×10 3 s 1 , but changed significantly when predeformation was introduced. Tensile test results of as-cast Al-4 wt.%Mg-0.4 wt.%Sc-0.5 wt.%Mm alloy show a significant oscillation of serration during deformation at room temperature, and the critical strain (H c ), which is the strain at the start of serration, decreases with increasing strain rate. Pre-deformation of Al-4wt%Mg-0.4wt%Sc-0.5wt%Mm also affects the serration oscillation: it decreases the critical strain at lower strain rate and increases it at higher strain rate (>2×10 4 s 1 ).

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