Direct Observation of Super‐Plasticity of Beta‐SiC Nanowires at Low Temperature
Direct Observation of Super‐Plasticity of Beta‐SiC Nanowires at Low Temperature
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DOI：
10.1002/adfm.200700162
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发表时间：
2007-11
影响因子：
19
通讯作者：
Y. Zhang;X. Han;K. Zheng;Z. Zhang;X. Zhang;J. Fu;Y. Ji;Y. Hao;X. Guo;Z. Wang
中科院分区：
文献类型：
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作者：
Y. Zhang;X. Han;K. Zheng;Z. Zhang;X. Zhang;J. Fu;Y. Ji;Y. Hao;X. Guo;Z. Wang
通过扫描电子显微镜的原位轴向拉伸实验，观察到了单晶β-碳化硅[111]纳米线的200%延伸率超塑性。碳化硅纳米线呈竹节状结构，呈3C结构，沿纳米线共生。轴向局域塑性和超塑性仅由3C段通过位错的产生、扩展和非晶化而产生，而高度缺陷的结构段由于缺乏滑移系而只进行弹性变形。这些结果为理解碳化硅纳米线的力学行为提供了关键信息。
Super‐plasticity of single‐crystal beta‐SiC [111] nanowires for > 200 % elongation was observed by in situ axial‐tensile experiments in a scanning electron microscope. The SiC nanowires were characterized by a bamboo‐like structure appearing as the 3C structured segments intergrowth along the nanowire. The axial localized plasticity and super‐plasticity are suggested to result only from the 3C segments, through dislocation generation, propagation and amorphization in contrast to the highly defected structural segments that conduct elastic‐deformation only, owing to the lack of slip systems. These results provide key information for understanding the mechanical behavior of SiC nanowires.