Stacking faults and mechanisms strain-induced transformations of hcp metals (Ti, Mg) during mechanical activation in liquid hydrocarbons
- Ural Branch of the Russian Academy of Sciences, Physical-Technical Institute (Russian Federation)
The evolution of the structure and substructure of metals Ti and Mg with hexagonal close-packed (hcp) lattice is studied during their mechanical activation in a planetary ball mill in liquid hydrocarbons (toluene, n-heptane) and with additions of carbon materials (graphite, fullerite, nanotubes) by X-ray diffraction, scanning electron microscopy, and chemical analysis. The temperature behavior and hydrogen-accumulating properties of mechanocomposites are studied. During mechanical activation of Ti and Mg, liquid hydrocarbons decay, metastable nanocrystalline titanium carbohydride Ti(C,H){sub x} and magnesium hydride β-MgH{sub 2} are formed, respectively. The Ti(C,H){sub x} and MgH{sub 2} formation mechanisms during mechanical activation are deformation ones and are associated with stacking faults accumulation, and the formation of face-centered cubic (fcc) packing of atoms. Metastable Ti(C,H)x decays at a temperature of 550°C, the partial reverse transformation fcc → hcp occurs. The crystalline defect accumulation (nanograin boundaries, stacking faults), hydrocarbon destruction, and mechanocomposite formation leads to the enhancement of subsequent magnesium hydrogenation in the Sieverts reactor.
- OSTI ID:
- 22771530
- Journal Information:
- Physics of the Solid State, Vol. 59, Issue 11; Other Information: Copyright (c) 2017 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7834
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOMS
CHEMICAL ANALYSIS
CRYSTALS
DEFORMATION
FCC LATTICES
GRAPHITE
HCP LATTICES
HYDROGEN
HYDROGENATION
LIQUIDS
MAGNESIUM
MAGNESIUM HYDRIDES
NANOTUBES
SCANNING ELECTRON MICROSCOPY
STACKING FAULTS
STRAINS
TITANIUM
TITANIUM HYDRIDES
X-RAY DIFFRACTION