The study on binary Mg–Co hydrogen storage alloys with BCC phase

Zhang, Yao; Tsushio, Yoshinori; Enoki, Hirotoshi; Akiba, Etsuo

doi:10.1016/j.jallcom.2004.09.065

Cited by 69 publications

(61 citation statements)

References 13 publications

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“…4) Furthermore, the diffusion of hydrogen in BCC metals is significantly faster than that in FCC and HCP metals. 5) In recent years, many attempts to synthesize Mg-based alloys with a BCC structure have been made and novel MgCo 6,7) and Mg-Tm-V (Tm: transition metals) 8) alloys have been successfully synthesized by means of ball milling. In our previous works, Mg-Ti alloys with a BCC structure have been successfully synthesized by means of ball milling.…”

Section: Introductionmentioning

confidence: 99%

Effect of Li Addition on Synthesis of Mg-Ti BCC Alloys by means of Ball Milling

2007

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The effect of Li addition to Mg on synthesis of Mg-Ti BCC alloys by means of ball milling was studied. Mg-x at%Li (x ¼ 4; 20; 46) alloys prepared by the induction melting method consisted of the HCP phase (Mg-type), the HCP phase + the BCC phase (Li-type) and the BCC phase, respectively. Lattice parameters of the HCP phase decreased with the increase in x, whereas those of the BCC phase at x ¼ 20 and 46 were smaller than that of Li. Mg-x at%Li (x ¼ 4; 20; 46) alloys and Ti were milled for 50-200 h in an argon atmosphere. Formation of Mg 96 Li 4 Ti 100 BCC alloy was confirmed by X-ray diffraction (XRD) measurements after 50 h milling. By Li addition to Mg, the synthesis time of the BCC phase was shortened. Li made Mg deformation facile by the activation of the non-basal slips in Mg, and raw materials were efficiently milled. The crystallite size of Ti was readily reduced and formation of the BCC phase was accelerated. The crystallite size and lattice parameter of Mg 96 Li 4 Ti 100 BCC alloy were similar to those of Mg 100 Ti 100 BCC alloy.

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Section: Introductionmentioning

confidence: 99%

Effect of Li Addition on Synthesis of Mg-Ti BCC Alloys by means of Ball Milling

2007

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“…Therefore, the substitution of Co for Ti in Mg-Ti binary alloys was conducted, considering that the inter-atomic distance of Co is shorter than Ti. According to the expectation, the successfully synthesized Mg-Co BCC alloys possessed much lower lattice parameter than Mg-Ti alloys [13]. Most of the Mg-Co BCC alloys absorbed hydrogen at 373 K. Mg 50 Co 50 alloy absorbed 2.1 mass% of hydrogen at this temperature.…”

Section: Introductionmentioning

confidence: 91%

The hydrogen absorption–desorption performances of Mg–Co–X ternary alloys with BCC structure

Zhang

Tsushio

Enoki

et al. 2005

Journal of Alloys and Compounds

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“…The small grain size of Mg allows for complete diffusion into the lattice in limited time. Conventionally, the kinetics of hydrogen absorption by Mg at the low temperatures would preclude the levels of absorption observed [15][16][17]. But in this case, the nanostructure of Mg together with distribution of MmNi 5 surface/grain boundary of Mg appears to have enhanced the kinetics substantially to provide for nearly full absorption even at temperature as low as 100 • C, with MmNi 5 probably acting as a conduit for diffusion of hydrogen into Mg grain.…”

Section: Hydrogen Storage Propertiesmentioning

confidence: 99%