CAJ | 학술논문

本文利用自创的热双金属片拉伸装置实现了在透射电镜中，对单晶Mo纳米线的原位拉伸实验。实验发现单晶Mo纳米线具有块体单晶材料2倍左右的塑性变形能力。观察发现变形过程中位错不断的形核产生、然后快速的运动并消失在纳米线表面是单晶Mo纳米线具有大塑性变形能力的一个重要原因。另外，利用选区电子衍射对拉伸断裂后的样品分析，发现拉伸后的纳米线的断口附近呈现多晶化。可以认为在高应变作用下，位错的滑移等因素导致单晶点阵局部扭转形成小角度晶界，纳米线局部从单晶转变成多晶。
본문이용자창적열쌍금속편랍신장치실현료재투사전경중，대단정Mo납미선적원위랍신실험。실험발현단정Mo납미선구유괴체단정재료2배좌우적소성변형능력。관찰발현변형과정중위착불단적형핵산생、연후쾌속적운동병소실재납미선표면시단정Mo납미선구유대소성변형능력적일개중요원인。령외，이용선구전자연사대랍신단렬후적양품분석，발현랍신후적납미선적단구부근정현다정화。가이인위재고응변작용하，위착적활이등인소도치단정점진국부뉴전형성소각도정계，납미선국부종단정전변성다정。
Using a homemade bi-metallic extensor, the in-situ tensile experiments of Mo nanowire was conducted in a transmission electron microscope. We demonstrate that the Mo nanowire exhibit ultra-large plastic deformation ability, which is about twice as much as its bulk counterpart. The dislocation nucleation, motion and escaping are responsible for the ultra-large strain ability. In addition, the selected area electron diffraction patterns indicated deformation can lead to single-crystal to poly-crystal transformation near the fracture, which was rarely seen in previous. Under high stress, the local crystal lattice distortion, dislocation slip etc. lead to single-crystal to poly-crystal transformation.