As-extruded AZ31B magnesium alloy fatigue crack propagation behavior

作者：Zhang Hongxia; Yan Zhifeng; Wang Wenxian^*; Liang Peiyang; Li Hongzhi; Wei Yinghui

来源：Journal of Wuhan University of Technology-Materials Science Edition, 2011, 26(6): 1114-1120.

DOI：10.1007/s11595-011-0373-3

• AZ31B magnesium alloy
• fatigue crack propagation rate
• brittle fracture

The fatigue crack propagation rate of as-extruded AZ31B magnesium alloy was studied. Compact tension [C(T)] of the notch direction parallel (T-L), vertical (L-T), and inclined at 45A degrees to the extrusion direction was investigated. The experimental results indicate that the crack propagation direction is parallel to the extrusion direction for T-L and L-T specimens, whereas the specimen inclined at 45A degrees has an angular deflection of 9A degrees to 11A degrees toward the extrusion direction. The T-L specimen has the fastest fatigue crack propagation rate, and the L-T specimen has the slowest rate, the fatigue crack propagation rate of the specimen inclined at 45A degrees is between the two directions. The crack tip propagates by both transgranular and intergranular fractures. Fatigue fractures consist of cleavage plane or quasi-cleavage and are brittle fractures. The fatigue striation occurs for specimens inclined at 45A degrees and its size is 3-15 mu m.

• 出版日期2011-12
• 单位太原理工大学