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《Heat Treatment of Metals》 2017-06
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Influence of extrusion ratio on microstructure and mechanical properties of AZ31B magnesium alloy

Lin Tao;Liu Yunteng;Zhou Jixue;Zhuang Haihua;Ma Baichang;Yang Yuansheng;New Materials Institute of Shandong Academy of Sciences;Shandong Key Laboratory for High Strength Lightweight Metallic Materials (HLM);Shandong Engineering Research Center for Lightweight Automobiles Magnesium Alloys;Institute of Metal Research,Chinese Academy of Sciences;  
Influence of extrusion ratio on microstructure and mechanical properties of AZ31 B magnesium alloy was studied. The microstructure was observed by means of optical microscopy( OM),the mechanical properties were examined by room-temperature tensile test and the tensile fracture morphology was observed by means of scanning electron microscopy( SEM). The results show that with extrusion ratio increasing,the microstructure of the alloy transform from partial dynamic recrystallization to complete dynamic recrystallization,and the microstructure is more homogeneous and finer. But the grain size declines a little when the extrusion ratio is increased from 61 to 109. With extrusion ratio increasing,both the strength and ductility are improved,and the maximum tensile strength,yield strength and elongation are340 MPa,271. 5 MPa and 21. 5%,respectively. But the mechanical properties of the extruded alloy are benefited a little under high extrusion ratio. The fracture mechanism of the alloy is transferred from mixed fracture mode to obvious ductility mode. Fine and homogeneous microstructure and good mechanical properties can be obtained by controlling the extrusion ratio during extrusion processing.
【Fund】: 山东省科学院青年基金;; 山东省自然科学基金(ZR2015EQ019)
【CateGory Index】: TG146.22;TG379
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