A Promising Approach to Solid-State Hydrogen Storage: Mechanical Nanostructuring Synthesis of Magnesium by High Pressure Torsion Extrusion

IF 1 Q3 ENGINEERING, MULTIDISCIPLINARY
Babak Omranpour Shahreza, Fjodor Sergejev, Julia Ivanisenko, Jacques Huot
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Abstract

This article presents an investigation into the impact of High Pressure Torsion Extrusion (HPTE) on the microstructural features, hardness and hydrogen storage, focusing on pure magnesium. HPTE is a modern mechanical nanostructuring technique that can refine the microstructural properties and subsequently affects the mechanical and functional properties of the materials. Two HPTE regimes were used in this study: (1) Direct Extrusion without rotation (DE), and (2) an extrusion speed of 6 mm/min along with a rotational speed of 1.8 rpm (v6w1.8). One sample in as-received conditions was also tested as a reference. Results showed increased hardness in the material after HPTE processing, with the DE sample reaching 60 HRB and the v6w1.8 sample exhibiting a gradient distribution of hardness from 71 to 83 HRB. X-ray diffraction analysis revealed significant microstructural refinement in the v6w1.8 sample. Results of hydrogenation kinetics showed that the DE sample absorbed up to 1.2 wt.% of hydrogen, while the v6w1.8 sample displayed 7.2 wt.% of hydrogen absorption, approaching the theoretical hydrogen storage capacity for magnesium (7.6 wt.%). These findings highlight the positive effects of HPTE on microstructural refinement and hydrogen storage, showcasing its potential for advancements in materials science and hydrogen-based energy technologies.
一种有前途的固态储氢方法:高压扭挤压机械纳米结构合成镁
本文以纯镁为研究对象,研究了高压扭转挤压(HPTE)对镁合金显微组织、硬度和储氢量的影响。HPTE是一种现代机械纳米结构技术,它可以细化材料的微观结构性能,从而影响材料的力学和功能性能。本研究中使用了两种HPTE方案:(1)无旋转直接挤出(DE),(2)挤出速度为6 mm/min,转速为1.8 rpm (v6w1.8)。在收到的条件下,还测试了一个样品作为参考。结果表明,经过HPTE处理后,材料的硬度有所提高,DE样品硬度达到60 HRB, v6w1.8样品硬度呈71 ~ 83 HRB的梯度分布。x射线衍射分析显示v6w1.8样品的显微组织有明显的细化。氢化动力学结果表明,DE样品的氢吸收率高达1.2 wt.%,而v6w1.8样品的氢吸收率为7.2 wt.%,接近镁的理论储氢量(7.6 wt.%)。这些发现突出了HPTE在微观结构细化和氢储存方面的积极作用,展示了它在材料科学和氢基能源技术方面的进步潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Advances in Science and Technology-Research Journal
Advances in Science and Technology-Research Journal ENGINEERING, MULTIDISCIPLINARY-
CiteScore
1.60
自引率
27.30%
发文量
152
审稿时长
8 weeks
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