Synthesis of Mg2Ni alloy by bulk mechanical alloying

Aizawa, Tatsuhiko; Kuji, Toshiro; Nakano, Hiroaki

doi:10.1016/s0925-8388(99)00263-7

Cited by 59 publications

(32 citation statements)

References 11 publications

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“…Bulk mechanical alloying (BMA) is mainly used to synthesize the non-equilibrium phase in both systems. Different from the synthesis of compounds in MgNi via BMA, [7][8][9][10] the adequate chemical composition as well as BMA-process conditions must be surveyed in the study. In addition, the solid state reaction to non-equilibrium phase, or, non-equilibration process, is also described objectively by using the time history of applied energy density and the change of magnetic properties during BMA.…”

Section: Introductionmentioning

confidence: 99%

Solid State Synthesis of Non-Equilibrium Phase in Mg-Co and Mg-Fe Systems via Bulk Mechanical Alloying

2003

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Mg-Co and Mg-Fe systems were employed as a candidate hydrogen storage alloy. Different from Mg-Ni system, there exist no line compounds of Mg 2 Co and Mg 2 Fe. Non-equilibration of these compounds is indispensable to make solid state synthesis. Bulk mechanical alloying was applied to this non-equilibration of Mg 2 Co with success. Planetary ball milling was also utilized to discuss the process efficiency of bulk mechanical alloying. In particular, the on-line monitored energy density was used to describe the homogeneous refining and solid-state reaction with increasing the number of cycles. Through SEM observation of intermediate phase change, the solid-state reaction commences when the total energy density exceeds the critical limit. SEM/EDX and XRD analyses assured that the synthesized non-equilibrium phase should be Mg 2 Co. The Goldschmidt-factor analysis was used to determine that the synthesized Mg 2 Co has mainly fcc-structure. No significant change of XRD profiles was observed even when increasing the holding temperature. This Mg 2 Co is quasi-stable, non-equilibrium phase even at the elevated temperature. In case of Mg-Fe system, the initial elemental particle mixture was homogeneously refined. Under the similar condition to the solid-state synthesis of Mg 2 Co, however, Mg 2 Fe was not synthesized even via bulk mechanical alloying. Through precise analysis, nonequilibrium phase with high iron content was recognized, so that non-equilibration via the bulk mechanical alloying might well be effective to investigate the solid state synthesis of binary compounds even in Mg-Fe system.

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Section: Introductionmentioning

confidence: 99%

Solid State Synthesis of Non-Equilibrium Phase in Mg-Co and Mg-Fe Systems via Bulk Mechanical Alloying

2003

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“…Nearly the same pass procedure as reported in Ref. 7) was utilized in the actual bulk mechanical alloying operation: two compression modes and one forward extrusion mode were employed as a loading sequence per cycle. The maximum applied load was limited by 550 kN.…”

Section: Methodsmentioning

confidence: 99%

“…The number of cyclic loading (N) was varied from N ¼ 0 to N ¼ 2500 to describe the alloying process from elemental mixture to compounds with increasing N. Details in the forging facilities and loading schedule were found elsewhere. 7,8) All through BMA, the sample material was processed in BMA at argon atmosphere and under forced cooling conditions.…”

Section: Methodsmentioning

confidence: 99%

“…5,6) Bulk mechanical alloying (BMA) was successfully applied to solid-state synthesis of Mg 2 Ni from elemental powder mixture. 7) In addition to grain size refinement of Mg 2 Ni to 5-10 nm, non-equilibration is accommodated to this solid-state synthesis of Mg 2Àx Ni for 0 < x < 0:5 via BMA. This BMA process is driven by the repeated plastic deformation, flow and circulation by using the forging-type pass schedule in the die-set system for mixing, refining and alloying.…”

Section: Introductionmentioning

confidence: 99%

“…It needs shorter process time, and has less or even no contamination which is an obstacle in solid-state reactions in the conventional repeated milling or attrition. 7,8) In the present study, this BMA method is applied to fabrication of Mg 2 Co alloy from the starting element constituent mixtures of magnesium and cobalt. This solidstate reaction process is first described by on-line measurement of imposed mechanical energy on BMA as well as XRD and DTA analyses.…”

Section: Introductionmentioning

confidence: 99%

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Solid-State Synthesis of Hydrogen Storage Mg<SUB>2</SUB>Co Alloys <I>via</I> Bulk Mechanical Alloying

2006

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Mg-Co system is employed to investigate the solid-state reactivity of Mg 2 Co from the elemental powder mixture of magnesium and cobalt and to describe the hydrogenation and de-hydrogenation processes of Mg 2 Co. Mg 2 Co is successfully solid-state synthesized as a nonequilibrium phase compound by the bulk mechanical alloying. This solid-state reactivity is controlled by the repeated plastic flow of ductile elements in the powder mixture. This non-equilibrium phase, Mg 2 Co is stable up to 833 K. Its hydrogenation and de-hydrogenation processes are described by DSC, PCT and XRD. These processes take place in multi-step with strong dependency on the holding temperature. Hydrogenation process from Mg 2 Co is composed of two steps to Mg 2 CoH 5 and dehydrogenation from Mg 2 CoH 5 , one step to Mg 2 Co, at 633 K. Maximum hydrogen absorption capacity at 633 K is still limited to 2.03 mass% since hydrogenation and de-hydrogenation steps, working at higher temperature, are never activated without chemical modification to original Mg 2 Co.

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Mg₁₇Al₁₂Intermetallic Prepared by Bulk Mechanical Alloying

Sakuragi¹,

Sato²,

Honjo³

et al. 2011

Magnesium Technology 2011

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Synthesis of Mg2Ni alloy by bulk mechanical alloying

Cited by 59 publications

References 11 publications

Solid State Synthesis of Non-Equilibrium Phase in Mg-Co and Mg-Fe Systems via Bulk Mechanical Alloying

Solid State Synthesis of Non-Equilibrium Phase in Mg-Co and Mg-Fe Systems via Bulk Mechanical Alloying

Solid-State Synthesis of Hydrogen Storage Mg<SUB>2</SUB>Co Alloys <I>via</I> Bulk Mechanical Alloying

Mg₁₇Al₁₂Intermetallic Prepared by Bulk Mechanical Alloying

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Synthesis of Mg2Ni alloy by bulk mechanical alloying

Cited by 59 publications

References 11 publications

Solid State Synthesis of Non-Equilibrium Phase in Mg-Co and Mg-Fe Systems via Bulk Mechanical Alloying

Solid State Synthesis of Non-Equilibrium Phase in Mg-Co and Mg-Fe Systems via Bulk Mechanical Alloying

Solid-State Synthesis of Hydrogen Storage Mg<SUB>2</SUB>Co Alloys <I>via</I> Bulk Mechanical Alloying

Mg17Al12Intermetallic Prepared by Bulk Mechanical Alloying

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Mg₁₇Al₁₂Intermetallic Prepared by Bulk Mechanical Alloying