Formation of an ordered phase in hcp precipitates during aging of bcc HfNbTaTiZr high-entropy alloy

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

Scripta Materialia Pub Date : 2025-03-12 DOI:10.1016/j.scriptamat.2025.116634

Yujun Zhao , Felix Großwendt , Maik Rajkowski , Parham Gemagami , Régis Poulain , Loïc Perrière , Jean-Philippe Couzinié , Sebastian Weber , Guillaume Laplanche , Tong Li

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Abstract

The role of O in the precipitation behavior at high temperatures of the equiatomic body-centered cubic (bcc) HfNbTaTiZr high-entropy alloy remains unclear and hence is investigated in this work. We employed transmission electron microscopy and atom probe tomography to reveal structural and compositional evolutions of precipitation in HfNbTaTiZr upon isothermal aging at 1200 °C. Due to the presence of O in the atmosphere, a Zr-Hf-rich hexagonal closed-packed (hcp) phase precipitates from the bcc matrix after 200 h. Due to the gradual uptake of O by the alloy from 200 h to 500 h, the Ti and O concentrations of the hcp phase increase. This results in the formation of an ordered phase in the hcp phase with a structure similar to Ti₃O, whose number density and size slightly increase with time. As the hcp phase is increasingly reinforced by oxygen solutes and oxide precipitates, it becomes harder.

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bcc HfNbTaTiZr高熵合金时效过程中hcp析出相中有序相的形成

氧在等原子体心立方HfNbTaTiZr高熵合金高温析出行为中的作用尚不清楚，因此本文进行了研究。利用透射电镜和原子探针断层扫描技术，研究了HfNbTaTiZr在1200℃等温时效过程中析出物的结构和成分演变。由于大气中O的存在，200 h后从bcc基体中析出富zr - hf的六方封闭堆积相（hcp）。从200 h到500 h，由于合金逐渐吸收O， hcp相中的Ti和O浓度增加。这使得hcp相中形成了一个有序相，其结构与ti30o相似，其数量密度和尺寸随时间略有增加。随着氧溶质和氧化物析出物对hcp相的增强，hcp相变得越来越硬。

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.