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A systematic investigation of secondary phase dissolution in mg-sn alloys

Journal of Magnesium and alloys 2019年第4期7卷 725-737页

作者： Arushi Dev Niladri Naskar Nishant Kumar Ashutosh Jena Manas Paliwal Department of Materials Science and Engineering Indian Institute of TechnologyGandhinagarPalaj CampusGandhinagarGujarat 382355India Seoul Nation University Seoul 08826Republic of Korea

As-cast mg-sn alloys(3,6,and 9 wt%sn)were solution treated at 653,703 and 753 K(380,430 and 480℃)for 1,4,8,12 and 24 h to determine the variation of secondary phase with respect to sn content,temperature and ***-3 wt%sn exhibits mg2sn dissolution at all solution treatment temperatures whereas mg-6 and 9 wt%sn alloy displays mg2sn reprecipitation and dissolution depending on the heat treatment *** addition,a combined mathematical model that predicts the secondary phase dissolution and solute redistribution as a function of temperature and time is presented in this *** model is a significant improvement compared to the previous studies where the dissolution and homogenization processes are considered *** effect of grain size and solute mobility upon the dissolution and homogenization kinetics is discussed as well.

关键词： Solution treatment Homogenization Dissolution mg-sn alloys

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Effects of Gd on the Microstructure and Mechanical Properties of mg-3sn alloys

Effects of Gd on the Microstructure and Mechanical Propertie...

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中国材料大会2012

作者： Jun Luo Rongshi Chen Enhou Han State Key Laboratory for Corrosion and Protections Institute of Metal ResearchChinese Academy of Science Graduate School of the Chinese Academy of Sciences

ISBN: (纸本)9783037856086;3037856084

The microstructure and mechanical properties of as-cast mg-3sn-xGd（x=0, 0.2, 1 wt.%） alloys were studied by using OM, SEM, EDX, XRD etc. With the increase of Gd, the formation of mg2sn phase was impeded and the mgsnGd phase formed and the volume fraction of this new phase obviously increased. The ultimate tensile strength and elongation to failure increased with dilute Gd addition but sharply decreased when the Gd addition comes to 1.34 wt.%. The possible reasons for the variation in microstructure and mechanical properties were discussed.

关键词： mg-sn alloys Gadolinium (Gd) Microstructure Mechanical properties

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Electron beam irradiation induced metastable phase in a mg-9.8 wt%sn alloy

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Journal of Materials Science & Technology 2021年第25期84卷 133-138页

作者： Chaoqiang Liu Houwen Chen Min Song Jian-Feng Nie State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China College of Materials Science and Engineering Chongqing UniversityChongqing400044China Electron Microscopy Center Chongqing UniversityChongqing400044China Department of Materials Science and Engineering Monash UniversityVictoria3800Australia

Aberration-corrected scanning transmission electron microscopy has been used to study a novel metastable phase,designated asβ’’phase,induced to form by electron beam irradiation in a mg-9.8 wt.%sn *** phase is spherical in three dimensions,having a D019 structure with the lattice parameters of a=0.642 nm,c=0.521 nm and space group of P63/*** chemical formula is mg_(3)sn,like theβ’metastable precipitate *** orientation relationship between theβ’’phase and theα-mg matrix is such that■_(β)’’//■_(α)and(0001)_(β)’’//(0001)_(α).Its formation involves solely the ordering of sn atoms in the solid solution magnesium ***-principles calculations indicate that the formation of theβ’’phase is energetically favored.

关键词： mg-sn alloys Metastable phase Irradiation HAADF-STEM Density functional theory

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Ordered sn distribution adjacent to the precipitate-matrix interface in a mg-9.8wt.%sn alloy

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Journal of Magnesium and alloys 2022年第7期10卷 1909-1914页

作者： Chaoqiang Liu Houwen Chen Min Song Jian-Feng Nie State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China International Joint Laboratory for Light alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Department of Materials Science and Engineering Monash UniversityVictoria 3800Australia

The major interface betweenβ-mg_(3)sn precipitate plate and theα-mg matrix in a mg-9.8wt.%alloy has been investigated using aberrationcorrected scanning transmission electron microscopy and first-principles *** is found that sn atoms orderly distribute in the single layer of theα-mg matrix immediately adjacent to the broad surface ofβat the early stage of *** sn atoms substitute mg atoms located at the centers of equilateral triangles constituted by three mg columns in the outmost layer ofβ.First-principles calculations suggest that the ordered sn distribution is energetically favored and it not only decreases the interfacial energy of theβ-matrix interface but also hinders the occurrence of 1/3αshear that thickens theβplate.

关键词： mg-sn alloys Ordered distribution of solute atom HAADF-STEM First-principles calculations

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