Suppressing γ′ precipitates coarsening at high volume fractions in a NiCoCr alloy by synergy of Co and Cr

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-01-24 DOI:10.1016/j.scriptamat.2025.116561

S.Y. Yuan , Y.Q. Yang , B.B. Zhang , K.G. Wang , Y.T. Zhu , X.Y. Li , Y. Zhang

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引用次数: 0

Abstract

In this work, we investigated coarsening kinetics of γ′ precipitates at 800–950°C of a novel NiCoCr multicomponent alloy, which was designed to contain a high (Co+Cr) concentration and a high volume fraction of γ′ precipitates. Experimental results demonstrated that γ′ precipitates in the present NiCoCr alloy were more resistant to the thermal coarsening at temperatures above 900°C as compared to conventional Ni-based alloys. Analysis using the modified Lifshitz-Slyozov-Wagner (LSW) model revealed that both Co and Cr could serve as the dominating species to control γ′ precipitate coarsening. The synergy of Co and Cr led to the slower diffusion in the current NiCoCr alloy than those in dilute binary systems, responsible for the superior thermal stability of γ′ precipitates. Our work provides a new guideline for exploring the compositional space of NiCoCr-based multicomponent alloys with high volume fraction of γ′ precipitates but low γ′ coarsening rate.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.