Hydrogen storage performance and phase transformations in as-cast and extruded Mg-Ni-Gd-Y-Zn-Cu alloys  

作　　者：Hu Yao Guang Zeng Xin FTan Qinfen Gu Kazuhiro Nogita Jing Guo Qian Li 

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]Nihon Superior Centre for the Manufacture of Electronic Materials(NS CMEM),School of Mechanical and Mining Engineering,The University of Queensland,Brisbane,QLD 4072,Australia [3]Australian Synchrotron,ANSTO.800 Blackburn Rd,Clayton,VIC 3168,Australia [4]Hunan Baohuifeng New Material Science&Technology Co.,Ltd.Huaihua,Changsha 418000,China [5]National Engineering Research Center for Magnesium Alloys&College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [6]State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China

出　　处：《Journal of Materials Science & Technology》2023年第20期162-177,共16页材料科学技术（英文版）

基　　金：synchrotron PXRD experiment was conducted at the Powder Diffraction beamline,ANSTO Australian Synchrotron under proposal Nos.AS211/PD/16842 and AS221/PD/17948;G.Z.acknowledges the funding from the National Natural Science Foundation of China(No.51904352);Scientific Research Foundation of Hunan Provincial Education Department,China(No.22A0004)。

摘　　要：Thermal-mechanical processing of magnesium-based materials is an effective method to tailor the hydrogen storage performance.In this study,Mg-Ni-Gd-Y-Zn-Cu alloys were prepared by Direct Chill(DC)casting,with and without extrusion process.The influences of microstructure evolution,introduced by DC casting and thermal-mechanical processing,on the hydrogen storage performance of Mg-Ni-Gd-Y-ZnCu alloys were comprehensively explored,using analytical electron microscopy and in-situ synchrotron powder X-ray diffraction.The result shows that the extruded alloy yields higher hydrogen absorption capacity and faster hydrogen ab/desorption kinetics.As subjected to extrusion processing,theα-Mg grains in the microstructure were significantly refined and a large number of 14H type long-period stacking ordered(LPSO)phases appeared on theα-Mg matrix.After activation,there were more nanosized Gd hydride/Mg2Ni intermetallics and finer chips.These modifications synergistically enhance the hydrogen storage properties.The findings have implications for the alloy design and manufacturing of magnesiumbased hydrogen storage materials with the advantages of rapid mass production and anti-oxidation.

关 键 词：Magnesium alloy Hydrogen storage performance Nanosized hydride Grain refinement Synchrotron X-ray diffraction Long-period stacking ordered(LPSO)phase 

分 类 号：TB3[一般工业技术—材料科学与工程]