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
收藏
页码：515 / 520
页数：6
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