Microstructure and mechanical properties of Cu-Ni-Sn alloy regulated by trace rare earth element Y

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-09-05 DOI:10.1016/j.matchar.2024.114334

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Abstract

The microstructure and mechanical properties of Cu-12.5Ni-5Sn-xY alloys with different Y addition amounts prepared using spark plasma sintering (SPS) were investigated, and the relationship was discussed. Results indicate that the addition of Y could significantly improve the mechanical properties. When 0.4 wt% Y is added, the maximum hardness and yield strength are approximately 329.5 HB and 691.9 MPa, which are approximately 31 % and 48 % higher than that without Y, respectively. The addition of appropriate amount of Y can significantly refine the grains, promote the transformation of γ-phase in the α + γ coexisting structure from lamellar-shape to needlelike-shape, and significantly inhibit the nucleation and growth of discontinuous precipitation (DP). Especially, when 0.4 wt% Y is added, the nano-scale NiY₃ particles precipitated at the grain boundary can hinder the migration of the grain boundary and occupy the nucleation sites of the γ-phases. In general, grain refinement, nano-precipitation strengthening and inhibition of DP are the main reasons for the improvement of mechanical properties.

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痕量稀土元素 Y 调节铜镍锰合金的微观结构和力学性能

研究了采用火花等离子烧结（SPS）技术制备的不同Y添加量的Cu-12.5Ni-5Sn-xY合金的微观结构和机械性能，并讨论了其中的关系。结果表明，添加 Y 能显著改善合金的机械性能。当 Y 的添加量为 0.4 wt% 时，最大硬度和屈服强度分别约为 329.5 HB 和 691.9 MPa，比不添加 Y 时分别高出约 31% 和 48%。添加适量的 Y 能显著细化晶粒，促进α+γ 共存结构中的γ 相从片状向针状转变，并显著抑制不连续沉淀（DP）的成核和生长。特别是当加入 0.4 wt% 的 Y 时，在晶界析出的纳米级 NiY3 颗粒会阻碍晶界的迁移，并占据γ 相的成核位点。总的来说，晶粒细化、纳米沉淀强化和抑制 DP 是改善力学性能的主要原因。

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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.