位错迁移率对碳化钽异常硬度的洞察

IF 15.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Brennan R. Watkins, C. Haas Blacksher, Alyssa Stubbers, Gregory B. Thompson, Christopher R. Weinberger
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引用次数: 0

摘要

碳化钽,TaCx,已经多次被证明随着碳含量的减少而急剧变硬,然后随着进一步脱碳而变软。1963年首次观察到这种异常的硬度行为,几十年来一直没有令人满意的解释。以前尝试用弹性刚度来描述这种现象,但未能重现异常的硬度行为。在这项工作中,我们证明了随着x的减少,TaCx中的滑动系统偏好从{111}B1变化到{110}B1,而在TiCx中没有观察到这种转变。我们发现这是异常硬度的主要机制,由于{111}B1上的位错在低碳含量下解离成肖克利部分的有利能量降低。我们还提出了不同碳含量下体和薄膜TaCx的实验硬度测量。由于纳米晶薄膜中位错塑性的丧失,在体样品中观察到异常的硬度峰,而在薄膜中没有观察到异常的硬度峰。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Insights into the anomalous hardness of the tantalum carbides from dislocation mobility

Insights into the anomalous hardness of the tantalum carbides from dislocation mobility

The tantalum carbides, TaCx, have been repeatedly shown to harden dramatically with some loss of carbon content, then soften with further decarburization. First observed in 1963, this anomalous hardness behavior has been reproduced for decades without satisfactory explanation. Prior attempts to characterize this phenomenon using elastic stiffnesses have failed to reproduce the anomalous hardness behavior. In this work, we demonstrate a change in slip system preference from {111}B1 to {110}B1 in TaCx as x decreases, while no such transition is observed in TiCx. We find this to be the primary mechanism of the anomalous hardness, arising from reduced energetic favorability of dissociation of dislocations on {111}B1 into Shockley partials at lower carbon contents. We also present experimental hardness measurements for bulk and thin-film TaCx at different carbon contents. An anomalous hardness peak is observed in the bulk samples, but not in the thin films, due to loss of dislocation plasticity in the nanocrystalline films.

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来源期刊
Nature Communications
Nature Communications Biological Science Disciplines-
CiteScore
24.90
自引率
2.40%
发文量
6928
审稿时长
3.7 months
期刊介绍: Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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