Microstructure and mechanical properties of MoNbVTa0.5Alx refractory high entropy alloys

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2024-11-13 DOI:10.1016/j.ijrmhm.2024.106960

Wei Guo , Mengyuan Zhu , Sheng Yu , Weijie Zheng , Mi Zhao , Shulin Lü , Shusen Wu

引用次数: 0

Abstract

The specific strength of refractory high entropy alloys (RHEAs) is usually impaired due to the high density of constituent elements. In order to develop a low-density RHEA, the microstructure and mechanical property of MoNbVTa_0.5-based RHEAs with various Al additions have been investigated in this study. All samples exhibited a monolithic BCC solid solution structure. The addition of Al resulted in improved yield strength but a degraded plasticity at ambient temperature. In contrast, the yield strength consistently decreased with increasing Al content at elevated temperatures, and the softening occurred at ∼1000 °C. MoNbVTa_0.5Al_0.3 exhibited high specific strengths of 119.2 MPa cm³/g, 108.6 MPa cm³/g and 97.3 MPa cm³/g at 600 °C, 800 °C, and 1000 °C, respectively.

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MoNbVTa0.5Alx 高熵难熔合金的微观结构和力学性能

耐火高熵合金（RHEAs）的比强度通常会因组成元素的高密度而受损。为了开发低密度 RHEA，本研究对添加了不同铝元素的 MoNbVTa0.5 基 RHEA 的微观结构和机械性能进行了研究。所有样品都呈现出整体 BCC 固溶体结构。铝的添加提高了屈服强度，但降低了常温下的塑性。相反，在高温条件下，随着铝含量的增加，屈服强度持续下降，并在∼1000 °C时发生软化。MoNbVTa0.5Al0.3 在 600 ℃、800 ℃ 和 1000 ℃ 时分别表现出 119.2 MPa cm3/g、108.6 MPa cm3/g 和 97.3 MPa cm3/g 的高比强度。

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

$International Journal of Refractory Metals & Hard Materials$

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.