Mg-0.5Bi-0.5Sn alloys with and without microalloying with 0.5 wt%Mn were subjected to extrusion,and the effect of Mn microalloying on the microstructural characteristic and corrosion behavior of the extruded alloys wa...Mg-0.5Bi-0.5Sn alloys with and without microalloying with 0.5 wt%Mn were subjected to extrusion,and the effect of Mn microalloying on the microstructural characteristic and corrosion behavior of the extruded alloys was investigated.The results indicated that the average grain size and the density of dislocations decreased,and a new Mg_(26.67)Mn_(65.47)Fe_(7.86)second phase as well as grain boundary segregation of Sn atoms could be observed in certain micro-regions of the extruded dilute Mg-0.5Bi-0.5Sn-0.5 Mn alloy.The tailoring of microstructure resulted in the significant enhancement in corrosion resistance(R_(p)increased from 1095.91Ωcm^(2)to 5008.79Ωcm^(2)).In addition,grain boundary segregation resulted in intergranular corrosion and led to the dissolution of Sn atoms.Hence,the dissolution rate of the matrix in Mg-0.5Bi-0.5Sn-0.5Mn alloy could be inhibited by the corrosion product film containing an intermediate product(SnO_(2)).展开更多
Mg-0.5Sn-0.5Mn-0.5Ca(wt.%) alloys with different microstructures are designed through casting and extrusion with and without homogenization treatment prior to extrusion(HPE).The influence of HPE treatment on the micro...Mg-0.5Sn-0.5Mn-0.5Ca(wt.%) alloys with different microstructures are designed through casting and extrusion with and without homogenization treatment prior to extrusion(HPE).The influence of HPE treatment on the microstructural characteristics and resultant discharge properties of Mg-Sn-Mn-Ca alloy in extruded condition as anode for Mg-air battery was investigated.HPE treatment exerts a prominent effect on the grain structure and orientation,distribution of the second phase particles as well as the dislocation density of the extruded alloy.The HPE alloy exhibits a distinctly high cell voltage together with specific energy compared with that of Non-HPE one.Intermittent discharge tests confirm that the HPE alloy possesses a more excellent discharge activity and more stable discharge process than the NonHPE one.All results demonstrate that the HPE alloy is an attractive anode material for Mg-air battery with long-term storage and under intermittent discharge.展开更多
基金jointly supported by the National Natural Science Foundation of China(Grant nos.:51704209,51701060)Natural Science Foundation of Shanxi Province(Grant no.:201801D121088)+2 种基金Shanxi Province Science Foundation for Youths(Grant no.:2016021063)Shanxi Scholarship Council of China(Grant no.:2019032)the Science and Technology Major Project of Shanxi Province(Grant nos.:20191102008,20191102007)。
文摘Mg-0.5Bi-0.5Sn alloys with and without microalloying with 0.5 wt%Mn were subjected to extrusion,and the effect of Mn microalloying on the microstructural characteristic and corrosion behavior of the extruded alloys was investigated.The results indicated that the average grain size and the density of dislocations decreased,and a new Mg_(26.67)Mn_(65.47)Fe_(7.86)second phase as well as grain boundary segregation of Sn atoms could be observed in certain micro-regions of the extruded dilute Mg-0.5Bi-0.5Sn-0.5 Mn alloy.The tailoring of microstructure resulted in the significant enhancement in corrosion resistance(R_(p)increased from 1095.91Ωcm^(2)to 5008.79Ωcm^(2)).In addition,grain boundary segregation resulted in intergranular corrosion and led to the dissolution of Sn atoms.Hence,the dissolution rate of the matrix in Mg-0.5Bi-0.5Sn-0.5Mn alloy could be inhibited by the corrosion product film containing an intermediate product(SnO_(2)).
基金jointly supported by the National Natural Science Foundation of China(Grant Nos.:51704209,51701060)Natural Science Foundation of Shanxi Province(Grant No.:201801D121088)+2 种基金Shanxi Province Science Foundation for Youths(Grant No.:2016021063)Shanxi Scholarship Council of China(Grant No.:2019032)the Science and Technology Major Project of Shanxi Province(Grant Nos.:20191102008,20191102007)。
文摘Mg-0.5Sn-0.5Mn-0.5Ca(wt.%) alloys with different microstructures are designed through casting and extrusion with and without homogenization treatment prior to extrusion(HPE).The influence of HPE treatment on the microstructural characteristics and resultant discharge properties of Mg-Sn-Mn-Ca alloy in extruded condition as anode for Mg-air battery was investigated.HPE treatment exerts a prominent effect on the grain structure and orientation,distribution of the second phase particles as well as the dislocation density of the extruded alloy.The HPE alloy exhibits a distinctly high cell voltage together with specific energy compared with that of Non-HPE one.Intermittent discharge tests confirm that the HPE alloy possesses a more excellent discharge activity and more stable discharge process than the NonHPE one.All results demonstrate that the HPE alloy is an attractive anode material for Mg-air battery with long-term storage and under intermittent discharge.
