Stress increase by nanoscale hcp precipitates in HfNbTaTiZr high entropy alloys

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2024-10-01 DOI:10.1016/j.scriptamat.2024.116401

Hiroyuki Y. Yasuda , Yusuke Yamada , Masato Onishi , Hiroki Suzuki , Ken Cho , Satoshi Ichikawa , Takeshi Nagase

引用次数: 0

Abstract

HfNbTaTiZr high entropy alloys show a stress increase around 873 K, especially in the single crystals. At 873 K, the bcc single phase is decomposed into the bcc1 and bcc2 phases due to spinodal decomposition with composition modulation along 〈100〉 direction. The bcc1 phase has Zr- and Hf-rich composition, while Nb and Ta are enriched in the bcc2 phase. Next, the hcp phase is precipitated along the bcc1 phase. As a result, the hcp phase is aligned parallel to {100} plane of the bcc phase. The fine hcp phase acts as a strong barrier to the dislocation motion, resulting in the stress increase at 873 K.

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HfNbTaTiZr 高熵合金中的纳米级 hcp 沉淀增加应力

HfNbTaTiZr 高熵合金在 873 K 附近显示出应力增加，尤其是在单晶体中。在 873 K 时，bcc 单相由于旋光分解而分解为 bcc1 和 bcc2 相，成分沿〈100〉方向发生调制。bcc1 相富含 Zr 和 Hf，而 bcc2 相则富含 Nb 和 Ta。接下来，hcp 相沿着 bcc1 相沉淀。因此，hcp 相平行于 bcc 相的{100}平面。细小的 hcp 相成为位错运动的强大障碍，导致 873 K 时应力增加。

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

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.