As-extruded AZ31B Magnesium Alloy Fatigue Crack Propagation Behavior

武汉理工大学学报-材料科学版(英文版), 2011, 26(6): 1114-1120. doi: 10.1007/s11595-011-0373-3

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

2.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

3.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

4.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

5.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

6.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

基金项目: the National Natural Science Foundation of China(50675148)

As-extruded AZ31B Magnesium Alloy Fatigue Crack Propagation Behavior

ZHANG Hongxia ^1, , YAN Zhifeng ^2, , WANG Wenxian ^3, , LIANG Peiyang ^4, , LI Hongzhi ^5, , WEI Yinghui ^6,

1.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

2.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

3.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

4.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

5.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

6.College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Keywords： AZ31B magnesium alloy

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 45° 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 45° has an angular deflection of 9° to 11 ° 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 45° 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 45° and its size is 3-15 μm.

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As-extruded AZ31B Magnesium Alloy Fatigue Crack Propagation Behavior

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