Roughening improves hydrogen embrittlement resistance of Ti-6Al-4V
Roughening improves hydrogen embrittlement resistance of Ti-6Al-4V
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DOI：
10.1016/j.actamat.2021.117304
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发表时间：
2021-09-22
期刊：
影响因子：
9.4
通讯作者：
Tasan, C. Cem
中科院分区：
文献类型：
--
作者：
Kim, Jinwoo;Hall, Dylan;Tasan, C. Cem
最常用的钛合金Ti-6Al-4V的抛光表面在充氢过程中会发生氢化物生长和相关脆化，而粗糙表面则没有这种敏感性。对复合氢气泡的直接微观分析和热解吸光谱（TDS）分析表明，表面粗化促进了原子氢向分子氢的复合，从而减少了原子氢的相对吸收量。亚表面飞行时间二次离子质谱（ToF-SIMS）进一步揭示了粗糙表面下的高缺陷密度阻碍了氢向体中的扩散。这些综合效应意味着，意想不到的是，粗化显著降低了Ti-6Al-4V对氢的吸收，并增强了其抗氢脆的能力——所有这些都是通过简单的表面处理产生的。(c) 2021 Acta Materialia Inc.Elsevier Ltd.出版。版权所有。
Polished surfaces of Ti-6Al-4V, the most commonly used titanium alloy, were observed to suffer from hydride growth and associated embrittlement during hydrogen charging, whereas rough surfaces suffered no such susceptibility. Direct microscopic analyses of recombined hydrogen bubbles and thermal desorption spectroscopy (TDS) revealed that the surface roughening promotes recombination of atomic hydrogen to molecular hydrogen, in turn, reducing the relative amount of atomic hydrogen uptake. Subsurface time-of-flight secondary-ion mass spectrometry (ToF-SIMS) further revealed that the high defect density underneath the roughened surface impedes hydrogen diffusion into the bulk. These combined effects mean that, unexpectedly, roughening significantly reduces hydrogen uptake into Ti-6Al-4V and enhances its resistance against hydrogen embrittlement - all resulting from a simple surface treatment. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.