Optimisation of the ball-milling and heat treatment parameters for synthesis of amorphous and nanocrystalline Mg2Ni-based alloys

Spassov, Тony; Solsona, P.; Suriñach, S.; Baró, Mònica

doi:10.1016/s0925-8388(02)00874-5

Cited by 37 publications

(34 citation statements)

References 17 publications

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“…Grain size reduction and/or residual strain arose from the MA treatment induced observable peak broadening in XRD data. 15) Moreover, the diffraction peaks of the (Mg 2 Ni) 97:5 Ti 2:5 powder was noticed to be broader in width due to its poor crystallinity after 15 h of MA.…”

Section: Resultsmentioning

confidence: 98%

Hydrogen Absorption Performance of Mechanically Alloyed (Mg2Ni)100−xTix Powder

et al. 2007

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The hydrogen storage alloy (Mg 2 Ni) 100Àx Ti x (x ¼ 0, 2.5, 5.0, 7.5 and 10.0 at%) powders were synthesized from elemental powder mixture by mechanical alloying (MA) under an Ar atmosphere. The as-milled powders were examined as a function of titanium addition by X-ray diffraction and synchrotron X-ray absorption near-edge structure (XANES) techniques at various milling time. The hydrogen absorption kinetics of the 15 h as-milled powders were evaluated. The maximum hydrogen absorption content of 15 h as-milled Mg 2 Ni powders can be improved from 3.14 mass% to 3.88 mass% when 5.0 at% of titanium was added. The hydrogenation rate of the Mg 2 Ni powder was also obviously enhanced by introducing the titanium into Mg 2 Ni lattices. More than 20% improvement of hydrogen absorption for Mg 2 Ni intermetallic powders was achieved by adding titanium.

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Section: Resultsmentioning

confidence: 98%

Hydrogen Absorption Performance of Mechanically Alloyed (Mg2Ni)100−xTix Powder

et al. 2007

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“…At higher temperatures (at about 396 °C) a third exothermic effect can be detected. It was proved that the first sharper peak corresponds to the crystallization (ordering) of the amorphous into nanocrystalline Mg2Ni [19]. Based on the results in Fig.2 (c), it was speculated that the second and the third exothermic peaks correspond to the crystallization of the amorphous into nanocrystalline (La, Mg)Ni3 and La2Mg17, respectively.…”

Section: Thermal Stability and Crystallizationmentioning

confidence: 88%

“…The first crystallization reaction is associated with a sharp exothermic DSC peak followed by a smaller and wider peak corresponding to the second crystallization reaction. It is also testified that the first sharper peak corresponds to the crystallization (ordering) of the amorphous into nanocrystalline Mg2Ni [19]. The crystallization temperature of the amorphous phase in the as-spun alloys first increases and then decreases with the increasing of Co content.…”

Section: Thermal Stability and Crystallizationmentioning

confidence: 93%

The Preparation and Hydrogen Storage Performances of Nanocrystalline and Amorphous Mg2Ni-Type Alloys

Zhang¹,

Shang²,

Zhao³

et al. 2012

Hydrogen Storage

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“…The diffraction peaks of Mg 2 Ni tended to be broadened due to the decrease in crystallite size with prolonging the milling time. 17) Grain size reduction and/or residual strain arose from the MA treatment induced observable peak broadening in XRD data. Fig.…”

Section: Methodsmentioning

confidence: 99%

Improvement of Hydrogen Absorption Performance of Mechanically Alloyed Mg2Ni Powders by Silver Doping

Chen

Lin

2007

Mater. Trans.

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In the present study, hydrogen-absorbed Mg 2 Ni intermetallic powders were prepared by mechanical alloying under an Ar atmosphere. Modification of the Mg 2 Ni powders was attempted by adding silver (0.5, 1.0, 2.5, and 5.0 at%) into starting elemental powder mixtures. The asmilled powders were examined as a function of milling time by X-ray diffraction and synchrotron X-ray absorption techniques. In addition, the hydrogen absorption performance of the 15 h as-milled powders were evaluated. The experimental results show that (Mg 2 Ni) 100Àx Ag x powders exhibited a mixture of Mg 2 Ni, magnesium and nickel solid solutions after 15 h of milling treatment. The maximum hydrogen absorption content and reversible hydrogen content of 15 h as-milled Mg 2 Ni powders was 3.14 and 2.40 mass%, respectively. An improvement of hydrogen absorption properties can be noticed by doping silver, but the less silver addition the better performance. In the present study, (Mg 2 Ni) 99:5 Ag 0:5 exhibited the best hydrogen absorption properties where the maximum hydrogen absorption content and reversible hydrogen content was increased significantly to 3.93 and 3.14 mass% respectively. More than 25% improvement of hydrogen absorption for Mg 2 Ni intermetallic powders was achieved by doping silver.

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Optimisation of the ball-milling and heat treatment parameters for synthesis of amorphous and nanocrystalline Mg2Ni-based alloys

Cited by 37 publications

References 17 publications

Hydrogen Absorption Performance of Mechanically Alloyed (Mg<SUB>2</SUB>Ni)<SUB>100−<I>x</I></SUB>Ti<I><SUB>x</SUB></I> Powder

Hydrogen Absorption Performance of Mechanically Alloyed (Mg<SUB>2</SUB>Ni)<SUB>100−<I>x</I></SUB>Ti<I><SUB>x</SUB></I> Powder

The Preparation and Hydrogen Storage Performances of Nanocrystalline and Amorphous Mg2Ni-Type Alloys

Improvement of Hydrogen Absorption Performance of Mechanically Alloyed Mg<SUB>2</SUB>Ni Powders by Silver Doping

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Optimisation of the ball-milling and heat treatment parameters for synthesis of amorphous and nanocrystalline Mg2Ni-based alloys

Cited by 37 publications

References 17 publications

Hydrogen Absorption Performance of Mechanically Alloyed (Mg<SUB>2</SUB>Ni)<SUB>100&minus;<I>x</I></SUB>Ti<I><SUB>x</SUB></I> Powder

Hydrogen Absorption Performance of Mechanically Alloyed (Mg<SUB>2</SUB>Ni)<SUB>100&minus;<I>x</I></SUB>Ti<I><SUB>x</SUB></I> Powder

The Preparation and Hydrogen Storage Performances of Nanocrystalline and Amorphous Mg2Ni-Type Alloys

Improvement of Hydrogen Absorption Performance of Mechanically Alloyed Mg<SUB>2</SUB>Ni Powders by Silver Doping

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Hydrogen Absorption Performance of Mechanically Alloyed (Mg<SUB>2</SUB>Ni)<SUB>100−<I>x</I></SUB>Ti<I><SUB>x</SUB></I> Powder

Hydrogen Absorption Performance of Mechanically Alloyed (Mg<SUB>2</SUB>Ni)<SUB>100−<I>x</I></SUB>Ti<I><SUB>x</SUB></I> Powder