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- W4245438046 abstract "Amorphous and nanocrystalline Mg-based alloys were produced by rapid quenching (melt-spinning) and their hydrogenation properties were studied. The thermal stability and crystallization behaviour of the as-quenched and hydrogenated alloys were investigated as well. It was found that the as-cast nanocrystalline/amorphous Mg75Ni20Mm5 (Mm=Ce, La-rich mischmetal) alloy possesses the best hydriding properties (hydrogenation kinetics and hydrogen absorption capacity) with maximum hydrogen capacity of 4.0 wt.% H. The difference in the hydriding properties of the as-quenched nanocrystalline and completely crystallized (with grain size in the range of 100–150 nm) Mg75Ni20Mm5 alloys was found to be insignificant. The amorphous and crystallized (after heat treatment) Mg87Ni12Y1 alloys show slower hydriding kinetics and lower hydrogen absorption capacity compared to the other Mg-based alloys studied. The amorphous Mg87Ni12Y1 exhibits faster initial hydrogenation kinetics than the partially and fully crystallized alloys with the same composition, due to faster hydrogen diffusion in the amorphous phase, but the hydrogen absorption capacity of all Mg87Ni12Y1 alloys having different microstructure is practically the same.The crystallization of melt-spun Mg75Ni20Mm5 and Mg87Ni12Y1 alloys is a two-step process. The primary crystallization of α-Mg (for Mg87Ni12Y1) takes place at about 160°C, followed by transformation of the residual amorphous matrix into a metastable phase, assigned as fcc Mg6Ni (isomorphic with fcc Mg6Pd (ao=2.0108 nm)). This intermediate metastable phase decomposes during further annealing (at about 300°C) into the equilibrium phases Mg2Ni and Mg. The product of the first crystallization reaction for the as-cast Mg75Ni20Mm5 alloy is Mg2Ni, most probably realized by growth of the quenched-in Mg2Ni nanocrystals. The second reaction corresponds to transformation of the residual amorphous matrix into Mg17Mm2." @default.
- W4245438046 created "2022-05-12" @default.
- W4245438046 date "2000-06-01" @default.
- W4245438046 modified "2023-10-17" @default.
- W4245438046 title "Heat treatment of sintered and cold forged aluminium-tin-copper-magnesium alloy parts" @default.
- W4245438046 doi "https://doi.org/10.1016/0026-0657(00)93032-7" @default.
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