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《Journal of Materials Science and Engineering》 2011-02
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Notch Impact Toughness and Fracture Mechanism of AZ31 Magnesium Alloy

LI Juan~1,WANG Wen-xian~1,ZHANG Lan~2,SU Juan~1,ZHANG Hong-xia~1(1.College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;2.Tangshan Special Equipment Supervision and Testing Institute,Tangshan 063020,China)  
Notch impact toughness is an important dynamic property for applications of metallic materials.Charpy V type notch impact test of AZ31 magnesium alloy was carried out from-80 ℃ to 260 ℃,and the relationship between notch impact toughness and temperature was tested.It is indicated that AZ31 magnesium alloy occurs ductile-brittle transition phenomena in the temperature range from 120 ℃ to 160 ℃,and the ductile-brittle transition temperature is about 140 ℃ according to both the energy criterion and ductility criterion.Moreover,scanning electron microscopy(SEM) micrographs of the fracture surfaces at-80 ℃,0 ℃,80 ℃,140 ℃,200 ℃ and 260 ℃ were comparatively analyzed,the results show that the fracture surfaces present quasi-cleavage patterns when temperature ranges from-80 ℃ to 80℃,quasi-cleavage and dimple patterns from 80 ℃ to 200 ℃ and many dimple patterns are found on fracture surfaces from 200 ℃ to 260℃.
【Fund】: 国家自然科学基金资助项目(50675148)
【CateGory Index】: TG146.22
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