Three Mg single crystalline round-bar specimens with different crystal orientations were subjected to uniaxial tension-compression fatigue tests, and crystal orientation dependence on fatigue fracture behavior was investigated. Loading directions of AD, BC and EF specimens were [11 20], [1 100] and [0001] respectively. Results show that, at stress amplitude (• a ) greater than or equal to 60 MPa, fatigue life of BC specimen was longest, while that of EF specimen was shortest. Under stress amplitude of 20 MPa, crystal orientation dependence on fatigue lives was not confirmed. Our study suggests that fatigue life in Mg single crystals show a high degree of dependence on crystal orientation and stress.
Three Mg single crystalline round bar specimens with different crystal orientations were subjected to uniaxial tension com pression fatigue tests, and the crystal orientation dependence on fatigue fracture behavior was investigated. The loading 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. Our study suggested that fatigue life in Mg single crystals show high dependence of crystal ori entation and stress.
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