NbTaZrMox系难熔高熵合金的组织与力学性能

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-23 DOI:10.1016/j.ijrmhm.2025.107457

Feng Liu , Xiangyang Shen , Yue Zhang , Fuyu Dong , Binbin Wang , Yanqing Su , Liangshun Luo , Jun Cheng

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引用次数: 0

摘要

在这里，我们描述了一项研究，其中热力学相图计算被用来设计一种材料，其成分将提供高强度和塑性。为此，采用真空电弧熔炼法制备了几种NbTaZrMox （x = 0,0.2, 0.4, 0.6, 0.8, 1.0）耐火高熵合金（RHEAs）。实验结果表明：NbTaZrMox RHEAs主要由富Ta、Mo、nb的BCC1相和富zr的BCC2相组成，微观结构为典型的枝晶态；随着Mo含量的增加，合金的硬度和室温屈服强度得到提高。Mo0.8合金的室温抗压屈服强度为1569 MPa，是等摩尔NbTaZr合金的1.8倍左右，而室温塑性保持在20%。合金的优异强度主要是固溶强化作用的结果。

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Microstructure and mechanical properties of refractory high-entropy alloys of NbTaZrMox system

Herein, we describe a study where thermodynamic phase diagram calculations were used to design a material whose composition would afford high strength and plasticity. To this end, several NbTaZrMox (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) refractory high entropy alloys (RHEAs) were prepared using a vacuum arc melting process. The experimental results showed that the NbTaZrMox RHEAs was mainly composed of Ta, Mo, Nb-rich BCC1 phase and Zr-rich BCC2 phase, and the microstructure is typical dendrite state. With the increase of Mo content, the hardness and room temperature yield strength of the alloy improved. The room temperature compressive yield strength of the Mo0.8 alloy was 1569 MPa, which was about 1.8 times greater than the equimolar NbTaZr alloy, while room temperature plasticity was maintained at 20 %. The excellent strength of the alloy was mainly the result of the effect of solid solution strengthening.

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.