Low-temperature oxidation behaviors of Cu-15Ni-8Sn alloy in different aging conditions

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-11-02 DOI:10.1016/j.matchar.2024.114519

Yi Gao , Ziyan Zhang , Jinjuan Cheng , Chaoqiang Liu , Kechao Zhou , Xueping Gan

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Abstract

Cu-15Ni-8Sn (wt%) alloy has been widely used in engineering applications due to its excellent mechanical strength, wear, and corrosion resistance. However, low-temperature oxidation (LTO) poses a significant challenge, restricting its further application and longevity. In this study, the low-temperature oxidation behavior of the Cu-15Ni-8Sn alloy under different aging condition was investigated using multi-scale characterization by SEM and TEM. The characterization results reveal the oxide films of the aged sample contain tri-layers at low temperature, the outermost layer is dominated by CuO and Cu₂O, the middle oxide layer contains of Cu₂O, NiO, SnO₂ and SnO, and the inner oxide layer is composed of NiO and SnO₂. In addition, the as-quenched sample has superior oxidation resistance compared to the aged samples, and the oxidation resistance of the aged samples decreases with the increase of aging time. That is, there is a trade-off between hardness and oxidation resistance in aged Cu-15Ni-8Sn alloys. Therefore, these findings provided a way to adjust the aging parameter based on specific service conditions.

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不同老化条件下 Cu-15Ni-8Sn 合金的低温氧化行为

Cu-15Ni-8Sn (wt%) 合金因其出色的机械强度、耐磨性和耐腐蚀性而被广泛应用于工程领域。然而，低温氧化（LTO）是一项重大挑战，限制了其进一步应用和使用寿命。本研究利用扫描电镜和电子显微镜进行多尺度表征，研究了 Cu-15Ni-8Sn 合金在不同老化条件下的低温氧化行为。表征结果表明，老化样品的氧化膜在低温下包含三层，最外层以 CuO 和 Cu2O 为主，中间氧化层包含 Cu2O、NiO、SnO2 和 SnO，内层氧化层由 NiO 和 SnO2 组成。此外，淬火样品的抗氧化性优于老化样品，而老化样品的抗氧化性随着老化时间的延长而降低。也就是说，老化后的 Cu-15Ni-8Sn 合金在硬度和抗氧化性之间存在权衡。因此，这些发现为根据特定的使用条件调整时效参数提供了一种方法。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.