预应变对 7075 铝合金氢脆的影响及分子动力学模拟

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2024-09-23 DOI:10.1016/j.ijhydene.2024.08.496

Yuhao Wang , Jiyan Liu , Zhanrui Wang , Fengshan Du

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引用次数: 0

摘要

本研究采用预应变和分子动力学（MD）方法研究了位错和晶界（GB）对铝合金氢脆的影响。氢提高了预应变合金的屈服强度（YS）和极限拉伸强度（UTS）。MD 模拟显示，氢提高了位错的临界分辨剪切应力 (CRSS)，而氢偏析 GB 则降低了材料强度。铝合金的 YS 和 UTS 在变形过程中受到这两种机制的影响，并且这两种机制呈现出竞争关系。在较高的位错密度变形中，氢增强的 CRSS 占主导地位。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Effect of pre-strain on hydrogen embrittlement of 7075 aluminum alloy and molecular dynamics simulation

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Effect of pre-strain on hydrogen embrittlement of 7075 aluminum alloy and molecular dynamics simulation

In this study, the effect of dislocation and grain boundary (GB) on hydrogen embrittlement of aluminum alloys was investigated using pre-strain and molecular dynamics (MD). Hydrogen increased the yield strength (YS) and ultimate tensile strength (UTS) of pre-strain alloys. MD simulations revealed that hydrogen enhance the critical resolved shear stress (CRSS) for dislocation, and hydrogen segregation GB reduce material strength. The YS and UTS of Al alloys are affected by both mechanisms during deformation, and the two mechanisms exhibit a competitive relationship. Hydrogen enhanced CRSS dominates in higher dislocation density deformations.

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.