Evolution of microstructure in MgH2 powder particles during high energy ball milling and hydrogen cycling

被引：11

作者：

Paik, B. ^{[1
]}

Jones, I. P. ^{[1
]}

Walton, A. ^{[1
]}

Mann, V. ^{[1
]}

Book, D. ^{[1
]}

Harris, I. R. ^{[1
]}

机构：

[1] Univ Birmingham, Coll Engn & Phys Sci, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 492卷 / 1-2期

关键词：

Energy storage materials; Hydrogen absorbing materials; Mechanical alloying; TEM; NANOCRYSTALLINE MAGNESIUM; DESORPTION; GAMMA-MGH2; IMPACTS;

D O I：

10.1016/j.jallcom.2009.11.154

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigated in details the evolution of microstructure by electron microscopy when powder MgH2 particles were ball milled up to 60 h. The average particle size reduced to less than 5 mu m within 5 h of milling from an average size of 38 mu m measured before milling. The grain size reduced from an average of similar to 750 nm in the un-milled powder to below 100 nm after milling. Particle size, as well as the grain size of milled powders followed log-normal distribution. Lattice strain was introduced significantly in the milled powder as a result of milling. Upon hydrogen cycling, this strain was reduced and the grain size was increased. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：515 / 520

页数：6

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