胡晓娜 陈威 邹晋 胡强 陆德平 马力. 冷喷涂及后续热-机械处理制备高强度高导电性Cu-10Fe原位复合材料[J]. 金属学报, DOI: 10.11900/0412.1961.2024.00443.

摘要 相关文章 Metrics 全文: PDF(1915 KB)   摘要: Cu-Fe合金因兼具高强度与高导电性潜力而备受关注，但传统熔铸法存在亚稳液相分离导致的成分偏析问题，且固溶Fe原子会显著降低Cu基体的电导率。为克服这些限制，本工作采用冷喷涂结合热处理和冷轧工艺，制备了具有高强度和高导电性的Cu-10Fe原位复合材料，揭示了处理过程中的微观结构演化规律，分析了复合材料的强化机制和导电机制。结果表明，冷喷涂沉积体呈现梯度纳米晶结构，即超细纳米Cu晶粒(80~800 nm)环绕微米级变形Fe晶粒(3.5~10 μm)和较为粗大的微米级Cu晶粒(1.5~10 μm)。热处理后，沉积体发生静态回复与再结晶，微米级变形Cu晶粒和Fe晶粒转变为等轴晶，超细纳米Cu晶粒长大成微米级等轴晶，同时生成退火孪晶Cu，位错密度显著降低。经过冷轧处理后，等轴晶沿轧制方向伸长，形成具有强<111>和<211>纤维织构的细长Cu晶粒，以及具有主导<110>织构的Fe纤维。经热-轧制处理后，冷喷涂Cu-10Fe沉积体中孔隙和界面结合不良的情况得到显著改善，获得了成分均匀无偏析、结构致密的Cu-10Fe原位复合材料。该材料具有良好的综合性能，抗拉强度为550 MPa，电导率为72%IACS。Cu-10Fe原位复合材料的高强度可归因于细晶强化、位错强化以及Fe纤维的载荷传递强化。在冷喷涂及后处理过程中，Cu-Fe沉积体中的Cu沉积颗粒与Fe沉积颗粒内部没有发生相互固溶，对于在不损失强度的情况下提高电导率起到关键作用。 关键词 ： 冷喷涂,  Cu-10Fe原位复合材料,  强度,  电导率     Abstract：Cu–Fe alloys are promising for electrical engineering applications due to their ability to combine high strength with excellent electrical conductivity. Conventional casting, however, suffers from severe limitations: metastable liquid-phase separation during solidification causes pronounced compositional segregation, while dissolved Fe atoms scatter conduction electrons, significantly reducing the Cu matrix conductivity. To address these issues, this study employs a novel fabrication route integrating cold spraying (CS) with post-deposition heat treatment (HT) and cold rolling (CR) to produce high-performance Cu–10Fe in situ composites. Spherical gas-atomized Cu and Fe powders were mechanically mixed and deposited onto an Al substrate using nitrogen propellant gas. The CS deposits underwent vacuum annealing at 600 °C for 24 h, followed by severe CR with 99% thickness reduction. Microstructural evolution, strengthening mechanisms, and electrical conductivity were systematically characterized using SEM, EBSD and TEM/EDS. The CS deposit exhibited a gradient nano-grained structure, comprising ultra-fine Cu nanograins (80–800 nm) surrounding deformed micron-sized Fe grains (3.5–10 μm) and coarser micron-sized Cu grains (1.5–10 μm), with low porosity (0.13%). Subsequent HT induced static recrystallization in the Cu matrix, producing equiaxed grains (~3.9 μm) and promoting recovery/recrystallization in the Fe particles. Interestingly, HT increased porosity to 0.86% and weakened some Cu/Fe interfaces, likely due to thermal expansion mismatch. Severe CR (HTCR state) markedly transformed the microstructure: equiaxed grains elongated along the rolling direction, forming Cu grains with strong <111> and <211> fiber textures and Fe fibers with a dominant <110> texture. This HTCR process enhanced interfacial bonding and reduced porosity to 0.09%, yielding a dense composite. Importantly, no mutual solid solubility between the Cu matrix and Fe fibers was observed, except for a narrow (~20 nm) atomic diffusion layer at the interfaces, as confirmed by TEM/EDS. The absence of Fe solute in Cu is critical for maintaining high electrical conductivity. The HTCR composite exhibited an exceptional combination of properties: an ultimate tensile strength of 550 MPa, far exceeding the CS (190 MPa) and HT (233 MPa) states, and a high electrical conductivity of 72%IACS. Its remarkable strength arises primarily from fine-grain strengthening, dislocation strengthening, and load transfer strengthening via Fe fibers. Notably, the experimentally measured strength (495 MPa) exceeds the calculated contribution from these mechanisms alone (367 MPa), highlighting the significant role of hetero-deformation-induced strengthening and potentially underestimated fine-grain strengthening from sub-EBSD-resolution grains. Together, these mechanisms account for the composite’s ultrahigh strength. The high electrical conductivity results from the absence of Fe solute scattering in the Cu matrix, improved interfacial bonding and pore elimination during HTCR, and the alignment of elongated Cu grains and Fe fibers along the current path, minimizing electron-scattering interfaces. Compared to conventionally fabricated Cu–Fe alloys (e.g., casting, powder metallurgy), the CS + HTCR Cu–10Fe composite exhibits a superior strength–conductivity balance. This study demonstrates that CS combined with tailored thermo-mechanical processing (HT + CR) provides an effective, industrially viable route to high-strength, high-conductivity Cu–Fe in situ composites with uniform composition and dense microstructure. Key words： cold spray    Cu-10Fe in-situ composite materials    strength    electrical conductivity 收稿日期: 2024-12-30      基金资助:深冷处理Cu-Ni-Si冷轧合金的析出动力学及强韧化机制;高强高导稀土铜铁材料关键技术研究;高齿沟槽无氧铜管材关键技术研究与开发;利用液相分离制备具有特殊结构铜铁合金的方法及机理;利用液相分离制备铜铁双金属复合材料的方法及机理研究 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 胡晓娜 陈威 邹晋 胡强 陆德平 马力 44.8K 链接本文: https://www.ams.org.cn/CN/Y0/V/I/0 [1] 韩晓东, 安子冰, 毛圣成, 龙海波, 杨鲁岩, 张泽. 负混合焓合金化推动高强韧合金发展[J]. 金属学报, 2025, 61(7): 953-960. [2] 李大禹, 姚志浩, 赵杰, 董建新, 郭婧, 赵宇. FGH4720Li粉末高温合金在近服役条件下的组织与力学性能演变规律[J]. 金属学报, 2025, 61(6): 826-836. [3] 马恩, 刘畅. 如何使合金兼具高强度与高塑性[J]. 金属学报, 2025, 61(5): 665-673. [4] 刘瑞良, 刘泉利, 李富霖. 冷喷涂后处理技术及其研究进展[J]. 金属学报, 2025, 61(10): 1449-1468. [5] 张竟文, 余黎明, 刘晨曦, 丁然, 刘永长. 高Cr马氏体耐热钢的协同强化机制及形变热处理应用[J]. 金属学报, 2024, 60(6): 713-730. [6] 苏帅, 韩鹏, 杨善武, 王华, 金耀辉, 尚成嘉. Ni含量对高强度低合金钢淬透性影响的晶体学认识[J]. 金属学报, 2024, 60(6): 789-801. [7] 程坤, 陈树明, 曹烁, 刘建荣, 马英杰, 范群波, 程兴旺, 杨锐, 胡青苗. 第一性原理研究钛合金中的沉淀强化[J]. 金属学报, 2024, 60(4): 537-547. [8] 彭祥阳, 张乐, 李聪聪, 侯硕, 刘迪, 周建明, 路广遥, 蒋虽合. 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