Superplastic forming characteristics of AZ41 magnesium alloy

An AZ41 magnesium alloy in the hot-rolled condition without further thermomechanical processing to modify its microstructure was investigated to establish its suitability for use within a superplastic forming process and to establish optimum forming parameters. Formability was assessed using elevated temperature tensile testing and hot gas bulging, across a range of strain rates (1x10(-1)-1x10(-3) s(-1)) and temperatures (350-450 degrees C). Circle grid analysis with GOM Aramis cameras was used to understand peak strains and material thinning in relation to industrial forming processes. Post forming EBSD and STEM analysis was conducted to understand the mechanisms responsible for the materials formability, with dynamic recrystallization being clearly evident. Peak elongation of 520% was achieved at 450 degrees C and 1x10(-3) s(-1); industrially relevant elongation was achieved at 1x10(-2) s(-1) at both 450 degrees C (195%) and 400 degrees C (170%).

Automated summary

The study investigated the suitability of a hot-rolled AZ41 magnesium alloy for superplastic forming process and established optimal forming parameters. The results showed excellent formability at specific temperatures and strain rates, with dynamic recrystallization playing a key role in the material's formability. Peak elongation of 520% was achieved, demonstrating the industrial relevance of the alloy in superplastic forming.