钝化
材料科学
合金
溶解
腐蚀
冶金
复合材料
热力学
化学工程
物理
工程类
图层(电子)
作者
William Blades,Benjamin W. Y. Redemann,Nathan Smith,Debashish Sur,M. S. Barbieri,Yuanlin Xie,Sebastian Lech,Elaf Anber,Mehdi Taheri,Chris Wolverton,Tyrel M. McQueen,John R. Scully,K. Sieradzki
出处
期刊:Acta Materialia
[Elsevier]
日期:2024-07-21
卷期号:277: 120209-120209
被引量:4
标识
DOI:10.1016/j.actamat.2024.120209
摘要
Single-phase multi-principal element alloys hold promise for improved mechanical properties as a result of multiple operative deformation modes. However, the use of many of these alloys in structural applications is limited as a consequence of their poor aqueous corrosion resistance. Here we introduce a new approach for significantly improving the passivation behavior of alloys by tuning the chemical short-range order parameter. We show that the addition of only 0.03 to 0.06 mole fraction of Al to a (FeCoNi)0.9Cr0.1 alloy changed both the magnitude and sign of the Cr-Cr order parameter resulting in passivation behavior similar to 304L stainless steel containing twice the amount of Cr. Our analysis is based on comparing electrochemical measures of the kinetics of passive film formation with chemical short-range order characterizations using time-of-flight neutron scattering, cluster expansion methods, density functional theory and Monte Carlo techniques. Our findings are interpreted within the framework of a recently proposed percolation theory of passivation that examines how selective dissolution of the non-passivating alloy components and short-range order results in excellent passive films at reduced levels of the passivating component.
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