Hot Deformation and Work Hardening Behavior of an Extruded Mg–Zn–Mn–Y Alloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第12期
论文作者：N.Tahreen D.F.Zhang F.S.Pan X.Q.Jiang D.Y.Li D.L.Chen
文章页码：1161 - 1170
摘 要：The aim of this study was to evaluate the strain hardening and hot deformation behavior of asextruded Mg-Zn-Mn（ZM31） magnesium alloy with varying Y contents（0.3,3.2,and 6 wt%） via compression testing along the extrusion direction at room temperature,200 °C and 300 ℃.Texture and phases were identified by X-ray diffraction.Alloy ZM31 + 0.3Y consisted of a mixture of fine equiaxed grains and elongated grains with I-phase（Mg3YZn6）;alloy ZM31 + 3.2Y contained I-phase and W-phase（Mg3Y2Zn3）;alloy ZM31 + 6Y had long-period stacking-ordered（LPSO） X-phase(Mg12YZn) and Mg24Y5 particles.With increasing Y content the basal texture became weakened significantly.While alloys ZM31 + 0.3Y and ZM31 + 3.2Y exhibited a skewed true stress-true stain curve with a three-stage strain hardening feature caused by the occurrence of {1012} extension twinning,the true stress-true stain curve of alloy ZM31 + 6Y was normal due to the dislocation slip during compression.With increasing temperature the extent of skewness decreased.While the compressive yield stress,ultimate compressive stress,strain hardening exponent,and hardening capacity all decreased as the temperature increased,the retention of the hightemperature deformation resistance increased with increasing Y content mainly due to the presence of thermally-stable LPSO X-phase.
N.Tahreen1，D.F.Zhang2,3，F.S.Pan2,3,4，X.Q.Jiang4,5，D.Y.Li6，D.L.Chen1
1. Department of Mechanical and Industrial Engineering,Ryerson University2. College of Materials Science and Engineering,Chongqing University3. National Engineering Research Center for Magnesium Alloys,Chongqing University4. Advanced Materials Research Center,Chongqing Academy of Science and Technology5. Faculty of Materials and Energy,Southwest University6. Department of Chemical and Materials Engineering,University of Alberta
摘 要：The aim of this study was to evaluate the strain hardening and hot deformation behavior of asextruded Mg-Zn-Mn（ZM31） magnesium alloy with varying Y contents（0.3,3.2,and 6 wt%） via compression testing along the extrusion direction at room temperature,200 °C and 300 ℃.Texture and phases were identified by X-ray diffraction.Alloy ZM31 + 0.3Y consisted of a mixture of fine equiaxed grains and elongated grains with I-phase（Mg3YZn6）;alloy ZM31 + 3.2Y contained I-phase and W-phase（Mg3Y2Zn3）;alloy ZM31 + 6Y had long-period stacking-ordered（LPSO） X-phase(Mg12YZn) and Mg24Y5 particles.With increasing Y content the basal texture became weakened significantly.While alloys ZM31 + 0.3Y and ZM31 + 3.2Y exhibited a skewed true stress-true stain curve with a three-stage strain hardening feature caused by the occurrence of {1012} extension twinning,the true stress-true stain curve of alloy ZM31 + 6Y was normal due to the dislocation slip during compression.With increasing temperature the extent of skewness decreased.While the compressive yield stress,ultimate compressive stress,strain hardening exponent,and hardening capacity all decreased as the temperature increased,the retention of the hightemperature deformation resistance increased with increasing Y content mainly due to the presence of thermally-stable LPSO X-phase.
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