Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

Edalati, Kaveh; Emami, Hoda; Staykov, Aleksandar; Smith, David J.; Akiba, Etsuo; Horita, Zenji

doi:10.1016/j.actamat.2015.07.060

Cited by 79 publications

(53 citation statements)

References 74 publications

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“…For example, the shear strain should be at least 10,000 and 100,000 for the initial phase sizes of 10 and 100 µm, respectively. Although the phases do not co-deform ideally in real condition of HPT processing, 48) we introduced shear strains over 10,000 in several Mg-based systems and examined their behaviors. 4953) Both Ti and Zr are totally immiscible in Mg even in the liquid form.…”

Section: Immiscible Systems With Significant Immiscibilitymentioning

confidence: 99%

Metallurgical Alchemy by Ultra-Severe Plastic Deformation via High-Pressure Torsion Process

Edalati¹

2019

Mater. Trans.

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Ultra-severe plastic deformation (ultra-SPD) is defined as the SPD processes in which the shear strains over 1,000 are introduced to a work piece. Despite significant activities on various SPD processes, limited studies have been conducted on the behavior of materials at shear strains over 1,000. The main reason for such limited studies is a consensus that the microstructural, mechanical and functional features usually saturate to the steady states at shear strains below 100. However, recent studies using the high-pressure torsion (HPT) method confirmed that significant changes occur at shear strains in the range of 1,000100,000. Here, some of the main findings reported recently by the application of ultra-SPD are reviewed: appearance of new levels of steady-state microhardness, atomic-scale elemental mixing in the miscible and immiscible systems, formation of new nanostructured phases / intermetallics, achievement of ultrahigh strength / high plasticity / room-temperature superplasticity, and development of advanced superconductors and hydrogen storage materials. [

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Section: Immiscible Systems With Significant Immiscibilitymentioning

confidence: 99%

Metallurgical Alchemy by Ultra-Severe Plastic Deformation via High-Pressure Torsion Process

Edalati¹

2019

Mater. Trans.

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“…Recent reports have shown that processing by large numbers of HPT turns can be used to mix different elements to magnesium at the atomic scale and thereby to tailor the hydrogen storage performance of the processed material. For example, a Mg4NiPd alloy was designed and fabricated by melting high purity pieces of the metals and processing by 1500 rotations of HPT under a pressure of 6 GPa where this alloy exhibited a body‐centered cubic (b.c.c.)…”

Section: Hydrogen Storagementioning

confidence: 99%

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Figueiredo

Langdon

2018

Adv Eng Mater

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Magnesium and its alloys have attracted significant attention in recent years because they display high strength-to-density ratios, they are biodegradable and they provide a potential for hydrogen storage. Many investigations have examined the effect of high-pressure torsion processing on the microstructures and properties of these materials so that numerous reports are now available. This overview provides a summary of the observations reported to date on the structure and mechanical property evolution including the nature of grain refinement, the grain boundary misorientation distributions, texture evolution, and the minimum grain size. For convenience, the mechanical properties are separated into hardness, tensile behavior, and superplastic properties. It is shown that the mechanism of grain refinement differs from other metallic materials processed by severe plastic deformation but high strength may be achieved in magnesium alloys and exceptional ductility in pure magnesium. Hydrogen storage and corrosion behavior are also examined together with a discussion of recent attempts to produce magnesium-based nanocomposites through processing by high-pressure torsion.

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“…Severe plastic deformation is an approach to synthesize bulk magnesium‐based hydrogen‐storage samples, and it can be realized by equal channel angular pressing (ECAP) or high‐pressure torsion (HPT) . Edalati et al.…”

Section: Approaches For Hydrogen‐storage Performance Enhancementmentioning

confidence: 99%

“…Edalati et al. reported that immiscible Mg−Zr and Mg−Ti alloy systems could be produced by HPT treatment under pressures of 1.5 or 3 GPa and showed certain hydrogen‐storage ability. The HPT‐treated Mg−Zr sample even reversibly absorbs and desorbs 1 wt % hydrogen at room temperature due to the Mg nanoclusters induced by HPT treatment.…”

Section: Approaches For Hydrogen‐storage Performance Enhancementmentioning

confidence: 99%

“…[55] Severe plasticd eformation is an approacht os ynthesize bulk magnesium-based hydrogen-storage samples,a nd it can be realized by equal channel angular pressing (ECAP) [56] or high-pressure torsion( HPT). [57,58] Edalati et al reported that immiscible MgÀZr [57] and MgÀTi [58] alloy systems could be produced by HPT treatment under pressureso f1 .5 or 3GPa and showedc ertain hydrogen-storage ability.T he HPT-treated MgÀZr sample even reversibly absorbs and desorbs 1wt% hydrogen at room temperature due to the Mg nanoclusters induced by HPT treatment.…”

Section: Synthetic Techniquesmentioning

confidence: 99%

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Progress and Trends in Magnesium‐Based Materials for Energy‐Storage Research: A Review

Shao¹,

Lin

et al. 2017

Energy Tech

157

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For the realization of a hydrogen economy, one enabling technology is hydrogen storage. Magnesium‐based materials (MBMs) are very promising candidates for hydrogen storage due to the large hydrogen capacity and low cost. Challenges in the development of magnesium‐based hydrogen‐storage materials for various applications, particularly for onboard storage, are poor kinetics and unsuitable thermodynamics. Herein, new methods and techniques adopted by the researchers in this field are reviewed, with a focus on how different techniques could affect the hydrogen‐storage properties of MBMs, including kinetics and thermodynamics. Based on current progress, research trends in MBMs for various applications are introduced. Classical work from some pioneers, important milestones, and the latest development for these possible applications are summarized and future prospects in these fields are discussed.

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Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

Cited by 79 publications

References 74 publications

Metallurgical Alchemy by Ultra-Severe Plastic Deformation via High-Pressure Torsion Process

Metallurgical Alchemy by Ultra-Severe Plastic Deformation via High-Pressure Torsion Process

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Progress and Trends in Magnesium‐Based Materials for Energy‐Storage Research: A Review

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