Enhanced mechanical and electrochemical performance of CoCrNi medium entropy alloy through multi-scale heterostructure

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-03-18 DOI:10.1016/j.vacuum.2025.114267

Pengcheng Ma , Jiongxian Li , Jiangjie Liao , Yiru Peng , Mian Chen , Jing Qiu , Jian Hu

引用次数: 0

Abstract

CoCrNi medium entropy alloy (MEA) demonstrates significant potential for engineering applications, yet enhancing its room temperature performance remains a challenge. In this study, a multi-scale heterostructured (MHS) CoCrNi MEA was fabricated using a combination of spark plasma sintering (SPS) and surface mechanical rolling treatment (SMRT). This innovative structure was characterized by a gradient distribution of grain size and defect density, along with a dispersed arrangement of short-range ordered structures at the sub-nanometer scale. This multi-scale heterostructure promoted heterogeneous deformation-induced (HDI) hardening, thereby achieving a superior balance of strength and ductility. In addition, the wear and corrosion resistance were significantly enhanced compared with SPSed sample, expanding the application potential of CoCrNi MEA.

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通过多尺度异质结构提高钴铬镍中熵合金的机械和电化学性能

钴铬镍中熵合金（MEA）在工程应用方面具有巨大潜力，但要提高其室温性能仍是一项挑战。本研究采用火花等离子烧结（SPS）和表面机械滚压处理（SMRT）相结合的方法，制造了一种多尺度异质结构（MHS）钴铬镍中熵合金。这种创新结构的特点是晶粒尺寸和缺陷密度的梯度分布，以及亚纳米级短程有序结构的分散排列。这种多尺度异质结构促进了异质变形诱导（HDI）硬化，从而实现了强度和延展性的完美平衡。此外，与 SPSed 样品相比，钴铬镍 MEA 的耐磨性和耐腐蚀性也显著增强，从而拓展了其应用潜力。

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

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.