THE ELASTO-PLASTIC TRANSITION IN MAGNESIUM ALLOYS

摘要

Published neutron diffraction data on internal strains in a texturedpolycrystal of AZ31 alloy and tensile data for a randompolycrystal of Mg are discussed from two complementary pointsof view, a purely phenomenological and a formal crystallographicone. It is suggested that the transition to full plasticity involvestwo different fractions of the grains population, at differentstrains. The role of texture and twinning are discussed. Criticalexperiments to test some of the hypotheses on how the elastoplastictransition develops are proposed.