Microstructure and properties of refractory high entropy alloys containing Si and Cr

IF 1.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Technology Pub Date : 2023-06-30 DOI:10.1080/02670836.2023.2228103

Rui Li, Song Zhang, Yonggang Xu

引用次数: 0

Abstract

Mo0.5NbHf0.5ZrTiAl, Mo0.5NbHf0.5ZrTiSi0.5Al and Mo0.5NbHf0.5CrZrTiAl (molar ratio) refractory high entropy alloys (RHEA) were prepared by vacuum arc melting. The influences of Si and Cr on microstructure and properties of RHEA were investigated. Three RHEA all contain BCC1 phase. Si addition promotes the formation of M5Si3 intermetallic compound, and the microstructure of Si0.5Cr0 RHEA consists of M5Si3 blocks and BCC1 + M5Si3 eutectics. Cr addition leads to the formation of Cr2Nb type Laves phase, and two BCC dendrites exist in Si0Cr RHEA. The compressive strength of Si0.5Cr0 and Si0Cr RHEA increased by about 102% and 85%, respectively, compared to Si0Cr0 one. The oxidation resistance of RHEA is improved by adding Si while dramatically degraded by adding Cr.

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含Si、Cr的难熔高熵合金的组织与性能

采用真空电弧熔炼法制备了Mo0.5NbHf0.5ZrTiAl、Mo0.5NbHf0.5ZrTiSi0.5Al和Mo0.5NbHf0.5CrZrTiAl(摩尔比)高熵合金(RHEA)。研究了Si和Cr对RHEA显微组织和性能的影响。三个RHEA均含有BCC1相。Si的加入促进了M5Si3金属间化合物的形成，Si0.5Cr0 RHEA的微观结构由M5Si3块体和BCC1 + M5Si3共晶组成。Cr的加入导致了Cr2Nb型Laves相的形成，在Si0Cr RHEA中存在两个BCC枝晶。Si0.5Cr0和Si0Cr RHEA的抗压强度比Si0Cr0分别提高了约102%和85%。添加Si可以提高RHEA的抗氧化性能，而添加Cr则会显著降低其抗氧化性能。

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

Materials Science and Technology 工程技术-材料科学：综合

CiteScore

2.70

自引率

5.60%

发文量

审稿时长

3 months

期刊介绍：《Materials Science and Technology》（MST） is an international forum for the publication of refereed contributions covering fundamental and technological aspects of materials science and engineering.