Roles of deformation twinning and dislocation slip in the fatigue failure mechanism of AZ31 Mg alloys
Received 19 January 2010; received in revised form 26 February 2010; accepted 4 March 2010. published online 08 March 2010.
Abstract
Fatigue tests were performed on AZ31 Mg alloys at room temperature in tension cycles. Deformation twinning of the type was observed both below and above the fatigue limit, indicating that the twins do not contribute directly to fatigue failure. However, prismatic slip and substantial cyclic hardening were observed above the fatigue limit. Progressive hardening gave rise to double twinning that led to the formation of large surface steps, cracks and eventual failure.
ABSTRACT
