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In-situ observation of interaction between dislocations and carbon nanotubes in aluminum at elevated temperatures
Materials Letters ( IF 3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matlet.2020.127323
B. Chen , K. Kondoh , J.S. Li

Abstract In this study, in-situ high-temperature transmission electronic microscopy is performed to investigate the formation mechanism of high-fraction (>50%) low-angle grain boundaries (LAGBs) in carbon nanotubes/aluminum (CNTs/Al) composites with balanced strength and ductility. During heating up the low-temperature-sintered composite, we find that dislocation bands first moves and then they are pinned by CNTs to form LAGBs. Abundant dislocations in the Al matrix and large-aspect-ratio CNTs are clarified as two critical factors for producing LAGBs. This study provides new insight into the effect of CNTs on the microstructural and mechanical properties of metal matrix composites.

中文翻译:

高温下铝中位错与碳纳米管相互作用的原位观察

摘要 本研究通过原位高温透射电子显微镜研究碳纳米管/铝 (CNTs/Al) 复合材料中高比例 (>50%) 低角度晶界 (LAGBs) 的形成机制。平衡的强度和延展性。在加热低温烧结复合材料的过程中,我们发现位错带首先移动,然后它们被 CNT 固定以形成 LAGB。铝基体中的大量位错和大纵横比的碳纳米管被阐明为生产 LAGB 的两个关键因素。这项研究为碳纳米管对金属基复合材料的微观结构和机械性能的影响提供了新的见解。
更新日期:2020-04-01
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