Microstructure Investigation on Metal Hydride Alloys by Electron Backscatter Diffraction Technique
Department of Chemistry, Wayne State University, Detroit, MI 48201, USA
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
Author to whom correspondence should be addressed.
Academic Editor: Andreas Jossen
Received: 28 April 2016 / Revised: 5 July 2016 / Accepted: 18 July 2016 / Published: 1 August 2016
The microstructures of two metal hydride (MH) alloys, a Zr7
and a C14 Laves phase based Ti12
, were studied using the electron backscatter diffraction (EBSD) technique. The first alloy was found to be composed of completely aligned Zr7
grains with a ZrO2
secondary phase randomly scattered throughout and a C15 secondary phase precipitated along the grain boundary. Two sets of orientation alignments were found between the Zr7
grains and the C15 phase: (001)Zr7Ni10A
, and (01
. The grain growth direction is close to Zr7Ni10B
. The second alloy is predominated by a C14 phase, as observed from X-ray diffraction analysis. Both the matrix and dendrite seen through a scanning electron microscope arise from the same C14 structure with a similar chemical composition, but different orientations, as the matrix with the secondary phases in the form of intervening Zr7
/(Zr,Ni)Ti needle-like phase coated with a thin layer of C15 phase. The crystallographic orientation of the C15 phase is in alignment with the neighboring C14 phase, with the following relationships: (111)C15
. The alignments in crystallographic orientations among the phases in these two multi-phase MH alloys confirm the cleanliness of the interface (free of amorphous region), which is necessary for the hydrogen-storage synergetic effects in both gaseous phase reaction and electrochemistry.
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Liu, Y.; Young, K.-H. Microstructure Investigation on Metal Hydride Alloys by Electron Backscatter Diffraction Technique. Batteries 2016, 2, 26.
Liu Y, Young K-H. Microstructure Investigation on Metal Hydride Alloys by Electron Backscatter Diffraction Technique. Batteries. 2016; 2(3):26.
Liu, Yi; Young, Kwo-Hsiung. 2016. "Microstructure Investigation on Metal Hydride Alloys by Electron Backscatter Diffraction Technique." Batteries 2, no. 3: 26.
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