Composites Part B: Engineering ( IF 12.7 ) Pub Date : 2023-06-28 , DOI: 10.1016/j.compositesb.2023.110873
Maobao Xu , Xuemei Liu , Hao Lu , Haibin Wang , Zhi Zhao , Chao Hou , Tielong Han , Xiaoyan Song
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A new strategy to establish a large number of interfacial coherence in nanocrystalline multi-phase composites was proposed. The route consisting of amorphization, crystallization and in-situ reaction was demonstrated using WC-Co composites as a typical example. Characteristics of crystal nucleation, growth crystallography, and phase transformation were studied in detail on the atomic scale for the ceramic grains. Mechanisms for the formation of specific interfacial coherence in the prepared nanocrystalline ceramic-metal composites were disclosed. Assisted by the interfacial coherence, the continuity of local deformation is maintained from metal to ceramic phase, resulting in a uniform strain extension instead of stress concentration at the interfaces. The present nanocrystalline composite achieved outstanding mechanical properties with simultaneously high hardness and fracture toughness. The findings in this work provide new insights to tailor grain structure and interface relationship in cermet composites for superior comprehensive mechanical performance.
中文翻译:
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纳米晶陶瓷-金属复合材料中特定界面相干性的增加
提出了一种在纳米晶多相复合材料中建立大量界面相干性的新策略。以WC-Co复合材料为例,论证了由非晶化、晶化和原位反应组成的路线。在原子尺度上详细研究了陶瓷的晶体成核、生长晶体学和相变特征谷物。揭示了在所制备的纳米晶陶瓷-金属复合材料中形成特定界面相干性的机制。在界面相干性的帮助下,从金属相到陶瓷相保持局部变形的连续性,从而导致均匀的应变延伸而不是界面处的应力集中。目前的纳米晶复合材料实现了出色的机械性能,同时具有高硬度和断裂韧性。这项工作的发现为定制金属陶瓷复合材料中的晶粒结构和界面关系提供了新的见解,以实现卓越的综合机械性能。