In-situ characterization of interfacial shear strength in multi-walled carbon nanotube reinforced aluminum matrix composites
In-situ characterization of interfacial shear strength in multi-walled carbon nanotube reinforced aluminum matrix composites
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DOI：
10.1016/j.carbon.2016.05.015
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发表时间：
2016-09
期刊：
影响因子：
10.9
通讯作者：
Weiwei Zhou;G. Yamamoto;Yuchi Fan;H. Kwon;T. Hashida;A. Kawasaki
中科院分区：
文献类型：
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作者：
Weiwei Zhou;G. Yamamoto;Yuchi Fan;H. Kwon;T. Hashida;A. Kawasaki
采用原位拔出法对多壁碳纳米管（MWCNT）增强铝基复合材料的界面剪切强度进行了定量表征。使用电子束诱导沉积方法将从复合材料的拉伸断裂表面突出的MWCNT的端部结合到原子力显微镜（AFM）悬臂梁的尖端。使用安装在扫描电子显微镜（SEM）内的纳米操纵器系统将MWCNT从Al基质中拉出。通过在高分辨率透射电子显微镜（HRTEM）下观察拉出的MWCNT来评估并入Al基质中的MWCNT的有效嵌入长度。六个多壁碳纳米管直，明显无损伤的嵌入式部分几乎垂直于断裂面，获得了有效的结果。MWCNT与Al基体之间的IFSS为24.8 ± 3.2MPa。MWCNT/Al复合材料的极限拉伸强度（UTS）与使用这些IFSS值的剪切滞后模型估计的值良好一致，导致在MWCNT/Al复合材料中直接接触的MWCNT-Al界面处实现60%的载荷传递效率。在本研究的拔出过程中未观察到MWCNT失效。
Quantitative characterization of interfacial shear strength (IFSS), in multi-walled carbon nanotube (MWCNT)-reinforced Al matrix composites, has been carried out using an in-situ pull-out technique. The end of an MWCNT protruding out of the tensile fracture surface of the composite was bonded to the tip of an atomic force microscopy (AFM) cantilever using an electron-beam-induced deposition method. The MWCNT was pulled out from the Al matrix using a nanomanipulator system installed inside a scanning electron microscope (SEM). The effective embedded length of the MWCNT incorporated in the Al matrix was evaluated by observing the pulled out MWCNT under high-resolution transmission electron microscopy (HRTEM). Valid results were obtained for six MWCNTs with straight, visibly damage-free embedded parts nearly perpendicular to the fracture surface. The IFSS between the MWCNT and the Al matrix was 24.8 ± 3.2 MPa. The ultimate tensile strength (UTS) of the MWCNT/Al composites is in good agreement with that estimated by the shear lag model using these IFSS values, resulting in the realization of 60% load transfer efficiency at the directly contacted MWCNT-Al interface in the MWCNT/Al composites. No MWCNT failure was observed during the pullout in this study.