Evaluation of Fatigue Fracture Behavior of Pure Mg Single Crystals using Round-bar Specimens

Abstract

Three Mg single crystalline round-bar specimens with different crystal orientations were prepared and then subjected to uniaxial tension-compression fatigue tests so as to investigate crystal orientation dependence on fatigue fracture behavior. The lording direction of AD, BC and EF specimens was [1120], [1100] and [0001] respectively. At stress amplitude (σ_a) over 60 MPa, fatigue life of BC specimen was longest and fatigue life of EF specimen was shortest. When the stress amplitude was 20 MPa, fatigue lives of all specimens were almost the same. Fatigue life in Mg single crystals showed high dependence of crystal orientation and stress.