基于自洽空隙的氢脆原理

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Scripta Materialia Pub Date : 2024-10-04 DOI:10.1016/j.scriptamat.2024.116403
Haiyang Yu , Jianying He , David Didier Morin , Michael Ortiz , Zhiliang Zhang
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引用次数: 0

摘要

仅根据含有空隙的金属材料的失效过程,我们就提出了自洽空隙氢脆(CVHE)预测框架的直接原理,该框架可有效捕捉韧性失效、氢引起的韧性损失,以及最重要的韧性到脆性的转变。虽然均匀分布的次生空隙的耦合效应已得到充分证实,但我们的方法的严谨性在于精确定义了大小相等、间距相等的次生空隙阵列,这些次生空隙与氢脆机制 HEDE、HELP 和 HESIV 相一致,位于主空隙之间的韧带中。CVHE 模型可以定量预测整个脆化范围;当次生空隙足够小时,它可以自然地揭示与固有延展性下限相关的韧带间脆性解粘。与直觉相反的是,我们的结果表明,随着二次空隙体积分数的降低,延展性会加速降低,而更小的空隙会导致更大的脆化。
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A self-consistent void-based rationale for hydrogen embrittlement
Solely based on the failure process of metallic materials containing voids, we propose a straightforward rationale for a self-consistent void-based hydrogen embrittlement (CVHE) predictive framework that effectively captures ductile failure, hydrogen-induced loss of ductility, and most importantly, the ductile-to-brittle transition. While the coupling effect of homogenously distributed secondary voids is well-documented, the rigor of our approach lies in the precise definition of an array of equally sized and spaced secondary voids nucleated aligning with the hydrogen embrittlement mechanisms HEDE, HELP and HESIV, in the ligament between primary voids. The CVHE model can quantitatively predict the full range of embrittlement; it naturally reveals the brittle inter-ligament decohesion associated with an intrinsic lower bound of ductility, when the secondary voids are sufficiently small. Counterintuitively, our results show that ductility reduction accelerates with a decrease in the secondary void volume fraction, and that smaller voids lead to greater embrittlement.
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来源期刊
Scripta Materialia
Scripta Materialia 工程技术-材料科学:综合
CiteScore
11.40
自引率
5.00%
发文量
581
审稿时长
34 days
期刊介绍: Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.
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