Application of Severe Plastic Deformation Techniques to Magnesium for Enhanced Hydrogen Sorption Properties

Huot, Jacques; Skryabina, N. E.; Fruchart, D.

doi:10.3390/met2030329

Cited by 63 publications

(46 citation statements)

References 41 publications

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“…ARB was also investigated as a mean to improve the activation of magnesium and its alloys 24,33,34,35,36 . Even though ECR does not refine the grain size at the same level, it may lead Mg-alloys to have good H 2 storage properties because of the presence of preferential texture in the direction of the (002) basal plane of Mg 24,37,38,39 . The deformation of metals by ECR occurs under high friction and in a non-homogeneous way through their thickness because of the introduction of large amounts of redundant shear-strain on the material's surface 40 .…”

Section: Introductionmentioning

confidence: 99%

Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties

et al. 2017

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Magnesium (Mg) is a light metal with relatively low cost. Its hydride (MgH 2 ) is interesting for the safe hydrogen storage in solid state and has a high gravimetric capacity of 7.6%. Practical application of Mg is still hampered by high reaction temperatures and slow kinetics. In order to improve it and focus on more viable industrial processing conditions, Mg plates, with or without iron (Fe) addition, in the form of wires and powders, were submitted to severe plastic deformation (SPD) in air, starting with extensive cold rolling (ECR), followed by repetitive rolling (ARB). The samples were characterized by X-ray diffraction (XRD), optical microscopy (OM), scanning (SEM) and transmission electron microscopy (TEM). H 2 storage properties were evaluated by differential scanning calorimetry (DSC) and Sievert's volumetric method. Mg processed by ECR+ARB resulted in larger grain refinement and densities of cracks than ECR. In addition, Fe in the form of continuous wires was fragmented and resulted in a better distribution of particles than powders, which agglomerated. Thus, finally, the synergetic effect of microstructural features and Fe as catalyst and its distribution improved activation, kinetics and hydrogen storage capacity.

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Section: Introductionmentioning

confidence: 99%

Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties

et al. 2017

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“…In route B, samples are rotated by 90° in the same direction between the passes. In route C, the samples are rotated by 180° between the passes [15]. Samples passed through the die once indicates one pass processed by ECAP.…”

Section: Ecap Technologymentioning

confidence: 99%

“…In route B, samples are rotated by 90 • in the same direction between the passes. In route C, the samples are rotated by 180 • between the passes [15]. The repetitive passes, together with the combination of different routes, strongly determines the final microstructure of the material [16,17].…”

Section: Ecap Technologymentioning

confidence: 99%

A Critical Review of Mg-Based Hydrogen Storage Materials Processed by Equal Channel Angular Pressing

Lisha

Jiang

et al. 2017

Metals

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Abstract:As a kind of cost-efficient hydrogen storage materials with high hydrogen capacity and light weight, Mg-based alloys have attracted much attention. This review introduces an effective technique in producing bulk ultrafine-grained (UFG) Mg alloys and promoting its hydrogen storage property, namely, equal-channel angular pressing (ECAP). This paper briefly describes the technical principle of ECAP and reviews the research progress on hydrogen storage properties of ECAP-processed Mg alloys. Special attention is given to their hydrogen storage behaviors including hydrogen storage dynamics, capacity, and cycling stability. Finally, it analyzes the factors that affect the hydrogen storage properties of ECAP-processed Mg alloys, such as the grain sizes, lattice defects, catalysts, and textures introduced by ECAP process.

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“…The melting of ZK60 Mg alloy was carried out in a resistance furnace with an iron crucible containing approximately 100 kg of metal and protected by CO 2 + 0.5% SF 6 atmosphere in order to prevent severe oxidation. The melt was transferred to a tundish from crucible at 710 • C and then transferred to the crystallizer.…”

Section: Casting Procedures and Samples Characterizationmentioning

confidence: 99%

Variable-Frequency Ultrasonic Treatment on Microstructure and Mechanical Properties of ZK60 Alloy during Large Diameter Semi-Continuous Casting

Chen

Wang

et al. 2017

Metals

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Traditional fixed-frequency ultrasonic technology and a variable-frequency ultrasonic technology were applied to refine the as-cast microstructure and improve the mechanical properties of a ZK60 (Mg-Zn-Zr) alloy during large diameter semi-continuous casting. The acoustic field propagation was obtained by numerical simulation. The microstructure of the as-cast samples was characterized by optical and scanning electron microscopy. The variable-frequency ultrasonic technology shows its outstanding ability in grain refinement compared with traditional fixed-ultrasonic technology. The variable-frequency acoustic field promoted the formation of small α-Mg globular grains and changed the distribution and morphology of β-phases throughout the castings. Ultimate tensile strength and elongation are increased to 280 MPa and 8.9%, respectively, which are 19.1% and 45.9% higher than the values obtained from billets without ultrasonic treatment and are 11.6% and 18.7% higher than fixed-frequency ultrasound treated billets. Different refinement efficiencies appear in different districts of billets attributed to the sound attenuation in melt. The variable-frequency acoustic field improves the refinement effect by enhancing cavitation-enhanced heterogeneous nucleation and dendrite fragmentation effects.

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Application of Severe Plastic Deformation Techniques to Magnesium for Enhanced Hydrogen Sorption Properties

Cited by 63 publications

References 41 publications

Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties

Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties

A Critical Review of Mg-Based Hydrogen Storage Materials Processed by Equal Channel Angular Pressing

Variable-Frequency Ultrasonic Treatment on Microstructure and Mechanical Properties of ZK60 Alloy during Large Diameter Semi-Continuous Casting

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