Grain refinement effects on the strain rate sensitivity and grain boundary sliding in partially solidified Al-5Â wt%Mg alloy

(2) Maximum elongation of up to 20% was found at 480 °C (fs: 0.939) in the grain refined structure. Based on the knowledge of superplastic behavior, the values of both neff≈2 and ξGBS≈70% at the temperature indicates superplastic-like deformation during the solidification, reducing solidification cracking susceptibility by grain refinement.