摘要
纳米金属层状材料具有优异的力学性能、抗辐照损伤性能和热稳定性,在诸多领域有着广阔的应用前景。但强度的上升往往伴随着塑性的降低,如何有效地平衡层状材料强度与塑性之间的矛盾,仍是目前层状材料界面设计的巨大挑战。当层厚减小至纳米尺度,界面所占比重大幅上升,可动位错的密度急剧降低,界面成为塑性变形的源头。因此研究界面结构与其塑性变形行为之间的关系,是理解纳米层状金属材料微观变形机制及其对力学性能影响的关键。结合目前国内外纳米金属层状材料研究的最新进展,本文以常见层状材料体系为例,系统阐述了界面强化机制、界面结构、界面主导的强度及塑性变形行为和主要界面调控方法等关键科学问题,并对层状材料界面研究发展趋势进行了展望。
Nanolayered metallic composites exhibit many extraordinary properties,such as high strength,high radiation damage resistance,and good thermal stability.Therefore,it has broad potential applications in many fields.However,similar to other nanocrystalline metallic materials,the strengthductility trade-off in nanolayered metallic composites is significant.Therefore,how to effectively balance the strength and ductility of nanolayered metallic composites is still a huge challenge in interface engineering.When the layer thickness is reduced to the nanoscale,the proportion of the interface increases substantially,and the density of mobile dislocations in grains decreases sharply,at the same time interface becomes the main source of plastic deformation.Thus,research into the relationship between the interface structure and its plastic behaviors is the key to understanding the microdeformation mechanisms of nanolayered metallic composites and their influence on mechanical properties.Based on the latest research progress,taking typical nanolayered metallic composites as examples,the key points,such as strengthening mechanisms,interface structures,plastic behaviors,and interface design methods are disscussed,and the prospects for future research trends are proposed.This review provides theoretical guidance for developing high-strength and high-ductility nanolayered metallic composites via interface engineering.
作者
郑士建
闫哲
孔祥飞
张瑞丰
ZHENG Shijian;YAN Zhe;KONG Xiangfei;ZHANG Ruifeng(Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology,School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300401,China;Institute of Heterogeneous Bonding Materials and Technologies,GRIMAT Engineering Institute Co.,Ltd.,Beijing 101407,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第6期709-725,共17页
Acta Metallurgica Sinica
基金
国家自然科学基金项目Nos.51771201和52071124
河北省自然科学基金重点项目No.E2021202135
天津市自然科学基金重点项目No.20JCZDJC00440
东北大学轧制技术与连轧自动化国家重点实验室开放课题No.2020RALKFKT002。
关键词
纳米金属层状材料
界面
位错
孪生
强度和塑性
nanolayered metallic composite
interface
dislocation
twin
strength and plasticity
