Nanocrystalline Mg and Mg alloy powders by hydriding-dehydriding processing

The process of mechanically assisted hydriding and subsequent thermal dehydriding was proposed to produce nanocrystalline Mg and Mg alloy powders using pure Mg and Mg-5.5%Zn-0.6%Zr （mass fraction）（ZK60 Mg） alloy as the starting materal. The hydriding was achieved by room-temperature reaction millin...

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Bibliographic Details
Published in:	Transactions of Nonferrous Metals Society of China Vol. 20; no. 7; pp. 1326 - 1330
Main Author:	王辛王珩胡连喜王尔德
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-07-2010 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Subjects:	Alloy powders dehydriching Grain size hydriding Hydrogen storage hydrogen treatment Magnesium Magnesium base alloys Mg alloy nanocrystalline Nanocrystals Scanning electron microscopy Vacuum annealing X射线衍射分析合金粉末扫描电子显微镜氢处理纳米晶透射电子显微镜 hydriding nanocrystalline Mg hydrogen treatment Mg alloy dehydriching
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Summary:	The process of mechanically assisted hydriding and subsequent thermal dehydriding was proposed to produce nanocrystalline Mg and Mg alloy powders using pure Mg and Mg-5.5%Zn-0.6%Zr （mass fraction）（ZK60 Mg） alloy as the starting materal. The hydriding was achieved by room-temperature reaction milling in hydrogen. The dehydriding was carried out by vacuum annealing of the as-milled powders. The microstructure and morphology of both the as-milled and subsequently dehydrided powders were characterized by X-ray diffraction analysis （XRD）, transmission electron microscopy （TEM）, and scanning electron microscopy （SEM）, respectively. The results show that, by reaction milling in hydrogen, both Mg and ZK60 Mg alloy can be fully hydrided to form nanocrystalline MgH2 with an average grain size of 10 nm. After subsequent thermal dehydriding at 300 ℃, the MgH2 can be turned into Mg again, and the newly formed Mg grains are nanocrystallines, with an average grain size of 25 nm.
Bibliography:	hydriding nanocrystalline 43-1239/TG Mg alloy TF123.71 Mg hydrogen treatment Mg; Mg alloy; hydriding; dehydriching; hydrogen treatment; nanocrystalline dehydriching TB383 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	1003-6326
DOI:	10.1016/S1003-6326(09)60299-5