Microstructure and Hydrogen Absorption/Desorption Behavior of Mg23-xLaxNi10 Alloy  

作　　者：董小平 杨丽颖 PANG Yanrong WANG Tao WEN Lijuan 

机构地区：[1]College of Quality and Technical Supervision, Hebei University, Baoding 071002, China [2]Research Center of New Energy Automobile, Hebei University, Baoding 071002, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2018年第2期476-484,共9页武汉理工大学学报（材料科学英文版）

基　　金：Founded by the National Natural Science Foundation of China(51371094 and 51161015);the Hebei University Experiment Center Project(sy2015091)

摘　　要：Induction melting was used as a routine method to synthesize Mg_（23）Ni_（10）, Mg_（22）LaNi_（10） and Mg_（21）La_2Ni_（10） alloys, and followed by a detailed microstructural characterization which included X-ray diffraction（XRD）, scanning electron microscopy（SEM） with energy dispersive spectrometer（EDS）, high resolution transmission electron microscope（HRTEM） and hydrogen absorption/desorption measurements. XRD analysis results showed that Mg_2Ni and Mg phases were detected in the XRD pattern of the Mg_（23）Ni_（10） alloy, however, the La addition results in conversion from Mg to LaMg_3 and La_2Mg_（17） phases and appearance of crystal defects included dislocations, twin grain boundary and vacancy in the Mg_（22）LaNi_（10） and Mg_（21）La_2Ni_（10） alloy textures. The total maximum hydrogen absorption capacity was 4.45 wt% for the Mg_（23）Ni_（10） alloy, however, the Mg_（22）LaNi_（10） and Mg_（21）La_2Ni_（10） alloys with vacancy, dislocations and twin grain boundary, absorbed 3.66 wt% and 3.60 wt%, respectively, indicating that the La addition led to decreasing of the maximum hydrogen absorption capacity. Besides, hydrogen absorption/desorption of 90% of saturated state expended for about 456 and 990 s for pristine Mg_（23）Ni_（10） alloy, by contrast, the time decreased owing to improvement of hydrogen absorption and desorption kinetics in the alloy with La element, with which the uptake time for hydrogen content to 90% of saturated state was 150 and 78 s, and 90% hydrogen can be released in 930 and 804 s for Mg_（22）LaNi_（10） and Mg_（21）La_2Ni_（10） alloys in the experimental condition.Induction melting was used as a routine method to synthesize Mg_（23）Ni_（10）, Mg_（22）LaNi_（10） and Mg_（21）La_2Ni_（10） alloys, and followed by a detailed microstructural characterization which included X-ray diffraction（XRD）, scanning electron microscopy（SEM） with energy dispersive spectrometer（EDS）, high resolution transmission electron microscope（HRTEM） and hydrogen absorption/desorption measurements. XRD analysis results showed that Mg_2Ni and Mg phases were detected in the XRD pattern of the Mg_（23）Ni_（10） alloy, however, the La addition results in conversion from Mg to LaMg_3 and La_2Mg_（17） phases and appearance of crystal defects included dislocations, twin grain boundary and vacancy in the Mg_（22）LaNi_（10） and Mg_（21）La_2Ni_（10） alloy textures. The total maximum hydrogen absorption capacity was 4.45 wt% for the Mg_（23）Ni_（10） alloy, however, the Mg_（22）LaNi_（10） and Mg_（21）La_2Ni_（10） alloys with vacancy, dislocations and twin grain boundary, absorbed 3.66 wt% and 3.60 wt%, respectively, indicating that the La addition led to decreasing of the maximum hydrogen absorption capacity. Besides, hydrogen absorption/desorption of 90% of saturated state expended for about 456 and 990 s for pristine Mg_（23）Ni_（10） alloy, by contrast, the time decreased owing to improvement of hydrogen absorption and desorption kinetics in the alloy with La element, with which the uptake time for hydrogen content to 90% of saturated state was 150 and 78 s, and 90% hydrogen can be released in 930 and 804 s for Mg_（22）LaNi_（10） and Mg_（21）La_2Ni_（10） alloys in the experimental condition.

关 键 词：Mg-based alloy microstructure hydrogen absorption/desorption behavior 

分 类 号：TG139.7[一般工业技术—材料科学与工程]