The Requirements for Superplasticity with an Emphasis on Magnesium Alloys

Abstract

Superplasticity is defined formally as a tensile elongation of at least 400% and a strain rate sensitivity of approximate to 0.5. It is now well established that superplasticity occurs only in materials having very small grain sizes, typically less than approximate to 10 mu m. These small grains may be achieved in two different ways in magnesium alloys: either by thermomechanical processing or through the occurrence of recrystallization in the early stages of deformation in alloys tested with coarse grain sizes.