Enhanced oxidation resistance in nano-lamellar CoCrFeNiNbx (0.45 ≤ x ≤ 0.55) eutectic high entropy alloy during cyclic oxidation at 700–1100 °C

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2024-10-05 DOI:10.1016/j.corsci.2024.112497

Deepsovan Mondal, Jayanta Das

引用次数: 0

Abstract

We report the superior oxidation resistance of nano-lamellar CoCrFeNiNb_x (x = 0.45, 0.50, 0.55 atom ratio) eutectic high entropy alloy (EHEA) at 700–1100 °C. The as-cast microstructure comprises of nano-lamellar eutectic FCC+Laves phases. The oxidation kinetics followed the parabolic rate in between 700–800 °C, whereas, near-parabolic kinetics is followed at 900 °C. The addition of Nb improves the oxidation and spallation resistance of the EHEAs. A protective outer-oxide layer containing Cr₂O₃, FeCr₂O₄-type spinels, whereas, an inner-oxide layer containing Nb₂O₅, CrNbO₄ were formed during oxidation. The mechanism of protection and the superiority of EHEAs as high temperature alloy are explored.

查看原文本刊更多论文

在 700-1100 °C 循环氧化过程中增强纳米层状 CoCrFeNiNbx (0.45 ≤ x ≤ 0.55) 共晶高熵合金的抗氧化性

我们报告了纳米板层钴铬铁镍铌（x = 0.45、0.50、0.55 原子比）共晶高熵合金（EHEA）在 700-1100 °C条件下的优异抗氧化性。铸造时的微观结构由纳米层状共晶 FCC+Laves 相组成。氧化动力学在 700-800 °C 之间呈抛物线速率，而在 900 °C 时则接近抛物线速率。铌的加入提高了 EHEA 的抗氧化性和抗剥落性。在氧化过程中形成了含有 Cr2O3、FeCr2O4 型尖晶石的保护性外氧化层，以及含有 Nb2O5、CrNbO4 的内氧化层。本文探讨了 EHEAs 作为高温合金的保护机制和优越性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.