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

Shigeki Morita; Nobuyoshi Ohno; Fujio Tamai; Yuji Kawakami

doi:10.4028/www.scientific.net/MSF.706-709.1233

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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Effect of Grain Size on Fatigue Crack Propagation...

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

Abstract:

This paper describes the fatigue crack propagation behavior of extruded AZ31B magnesium alloys (average grain size: approximately 15 and 119 μm, 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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Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

1233-1236

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.1233

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Online since:

January 2012

Authors:

Shigeki Morita, Nobuyoshi Ohno, Fujio Tamai, Yuji Kawakami

Keywords:

Basal Plane, C-Axis, Deformation Twin, Fatigue Crack Propagation, Magnesium, Texture

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