. Effect of Grain Size on Fatigue Crack Propagation in Extruded AZ31 Magnesium Alloys

被引：3
作者：
Morita, Shigeki [1 ]
Ohno, Nobuyoshi [1 ]
Tamai, Fujio [2 ]
Kawakami, Yuji [2 ]
机构：
[1] Saga Univ, Fac Sci & Engn, Dept Mech Engn, 1 Honjo Machi, Saga 8408502, Japan
[2] Mat & Environm Dept, Ind Technol Ctr 114 Yaemizo, Nabeshima machi, Saga 8490932, Japan
来源：
THERMEC 2011, PTS 1-4 | 2012年 / 706-709卷
关键词：
magnesium; fatigue crack propagation; texture; c-axis; basal plane; deformation twin; SINGLE-CRYSTALS; BEHAVIOR;
D O I：
10.4028/www.scientific.net/MSF.706-709.1233
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper describes the fatigue crack propagation behavior of extruded AZ31B magnesium alloys (average grain size: approximately 15 and 119 mu m, respectively). Fatigue crack propagation tests were performed on center cracked tension (CCT) specimens at a stress ratio of R=0.1 and a frequency of 10 Hz at room temperature. Loading axis was parallel to the extrusion direction; crack face was perpendicular to basal plane of each grain. The crack growth rate (da/dN) of the coarse-grained specimen was approximately 5 times higher than that of the fine-grained specimen. Fracture surfaces of the fine-grained and coarse-grained specimens showed various directional steps independent of macroscopic crack growth direction.
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页码：1233 / +
页数：2
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