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An Experimental Study of Fatigue Crack Growth in Different Orientation of Extruded #br#AZ31B Mg Alloy Bar |
ZHENG Sanlong CHEN Binbin ZHANG Wei GAO Zengliang** |
(College of Mechanical Engineering, Zhejiang University of Technology Engineering Research Center of Process Equipment and Its Re-manufacturing Ministry of Education, Hangzhou 310032) |
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Cite this article:
ZHENG Sanlong CHEN Binbin ZHANG Wei GAO Zengliang**. An Experimental Study of Fatigue Crack Growth in Different Orientation of Extruded #br#AZ31B Mg Alloy Bar. Chinese Journal of Materials Research, 2013, 27(4): 360-366.
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Abstract Fatigue crack growth (FCG) experiments were carried out using extruded AZ31B magnesium alloy bar. The pre-crack compact tension (CT) specimens were oriented in three different directions with respect to the extrusion direction. The experimental results reveal that the specimen orientation has a significant influence on the FCG rate and crack path. The FGC rate of the T-L specimen is the highest while the L-T specimen shows the lowest value. Typical macroscopic Mode I crack is developed in the T-L and T-R specimens whereas a deviation from the Mode I crack path and branching occur in the L-T specimens. For the L-T specimens, a plateau of constant crack growth rate occurs at low stress intensity factor range (). Transgranular cracking is the major cracking mode. Slip induced cleavage dominates the transgranular cracking in the T-L and L-T specimens whereas both twin boundary cracking and slip induced cleavage exist in the T-R specimens. The FCG rate decreases with the increasing load frequency at.
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