通过采用透射电镜对单晶体金属和w（C）为0.2%碳钢的动态拉伸进行了原位观察。研究了单晶体金属在100 000倍下位错的产生及运动和w（C）为0.2%的碳钢分别在变形量为9%、15%、27%情况下材料断裂的微观进展,以及位错的运动行为与金属断裂的关系。结果表明,金属中的位错主要在晶界或晶体的表面处产生,从而滑移到晶体内部;金属断裂的原因是由于位错聚集产生微观孔洞,微观孔洞逐渐长大发展而成。
The dynamic stretching of mono-crystal metal and 0.2 % w（C） carbon steel were observed by TEM.The formation and movement of dislocation of mono-crystal metal were studied in 100000 times;the micro-process of fracture of 0.2 % w（C） carbon steel with deformation ratio of 9 %,15 %,27 % were observed;and the relationship between the movement of dislocation and the fracture of metal were also researched.The results showed that the dislocation in metal was formed in the grain boundary or the surface of crystal and moved into the interior.The reason of metal fracture is due to the dislocation gathered to form small cavity and the small cavity grows up gradually to cause the fracture.
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