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近年来，在金属材料中引入梯度结构一直是研究热点，相较于单一结构材料，多级纳米结构材料可在变形过程中通过不同特征尺寸的结构相互协调，进一步优化材料的力学性能。结合现有研究成果，简要介绍了制备梯度纳米结构金属材料中的表面机械处理、累积叠轧+退火、激光冲击喷丸和物理或化学沉积等技术。根据微观组织特征定义了梯度纳米晶结构、梯度纳米孪晶结构、梯度纳米层片结构和梯度晶粒尺寸和孪晶厚度结构4种基本结构类型，总结了梯度纳米结构金属材料的强-塑协同效应、抗疲劳性能和耐磨性能等主要力学性能，讨论了其未来发展所面临的挑战。
Abstract：In recent years, the introduction of gradient structure in metallic materials has been a research hotspot. Compared with single structural material, multistage nanostructured materials can further optimize the mechanical properties of materials through the coordination of structures with different characteristic sizes during deformation. Combined with the existing research results, the surface mechanical treatment, accumulative roll bonding + annealing, laser shock peening and physical or chemical deposition in the preparation of gradient nanostructured metallic materials were introduced. According to the microstructure characteristics, four basic structural types were defined, including gradient nanocrystalline structure, gradient nanotwin structure, gradient nanolamellar structure and gradient grain size and twin thickness structure. The main mechanical properties such as strong-plastic synergistic effect, fatigue resistance property and wear resistance property of gradient nanostructured metallic materials were summarized, and the challenges for their future development were discussed.
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基本信息:
中图分类号:TG14;TB383.1
引用信息:
[1]闫佳鹤,杜一飞,冯运莉.梯度纳米结构金属材料制备及力学性能研究现状[J].塑性工程学报,2022,29(05):1-13.
基金信息:
国家自然科学基金资助项目(51974134); 河北省科技重大专项(21281008Z)
2022-05-23
2022-05-23
2022-05-23