Effect of Annealing on Vacancy-Type Defects and Heterogeneous Cu Precipitation Behavior in Fe₆₀Cr₁₂Mn₈Cu₁₅Mo₃V₂ Alloy.

IF 3.1 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2025-06-03 DOI:10.3390/ma18112613

Fengjiao Ye, Te Zhu, Peng Zhang, Peng Kuang, Haibiao Wu, Xingzhong Cao

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引用次数: 0

Abstract

This study systematically investigates the evolution of vacancy-type defects and heterogeneous Cu nanoprecipitates in an Fe₆₀Cr₁₂Mn₈Cu₁₅Mo₃V₂ (at%) multi-principal element alloy during thermal processing, utilizing Positron annihilation lifetime spectroscopy (PAS), coincidence Doppler broadening (CDB) spectroscopy, and transmission electron microscopy (TEM). The results show that the alloy exhibited a dual-phase coexistence structure of Body-Centered Cubic (BCC) and Face-Centered Cubic (FCC). The CDB results show that the density of heterogeneous Cu precipitates gradually increases with annealing temperature. Compared to the as-cast alloy, the precipitates annealed at 773 K exhibit a significantly reduced size (approximately 33 nm) with higher density. The PAS results demonstrate that gradual migration and aggregation of monovacancies at 573 K form vacancy clusters, while contraction and dissociation of these clusters dominate at 673 K. Within the temperature range of 773-973 K, the dynamic equilibrium between the aggregation and decomposition of vacancy clusters maintains stable annihilation characteristics with minimal lifetime changes.

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退火对Fe60Cr12Mn8Cu15Mo3V2合金中空位型缺陷及非均相Cu析出行为的影响

本研究利用正电子湮没寿命谱（PAS）、巧合多普勒展宽谱（CDB）和透射电子显微镜（TEM）系统地研究了Fe60Cr12Mn8Cu15Mo3V2 （at%）多主元素合金在热处理过程中空位型缺陷和非均质Cu纳米沉淀的演变。结果表明：该合金为体心立方（BCC）和面心立方（FCC）两相共存结构；CDB结果表明，随着退火温度的升高，非均相Cu析出物的密度逐渐增大。与铸态合金相比，在773 K退火的析出相尺寸明显减小（约33 nm），密度更高。PAS结果表明，在573 K时，单空位逐渐迁移和聚集形成空位团簇，而在673 K时，这些团簇以收缩和解离为主。在773 ~ 973 K的温度范围内，空位团簇的聚集和分解之间的动态平衡保持稳定的湮灭特性，寿命变化最小。

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来源期刊

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.