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.
|Number of pages||6|
|Journal||Journal of Alloys and Compounds|
|Publication status||Published - 1 Mar 2010|
- Mechanical alloying
- Energy storage materials
- Hydrogen absorbing materials