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用磁控溅射在醋酸纤维基片上获得纳米晶（２０～３０ｎｍ）铜膜，在透射电镜下原位拉伸的结果表明，在加载裂尖前存在由局部塑性变形引起的减薄带，微孔洞在减薄带中形核，导致主裂纹扩展的孔洞长大和连接过程也与局部塑性变形有关。
The nanocrystalline (20 ~ 30nm) copper film was obtained on a cellulose acetate substrate by magnetron sputtering. The results of in-situ tensile test under a transmission electron microscope showed that there were thinning bands caused by local plastic deformation before loading The holes nucleate in the thinning belt, resulting in the growth of the main crack growth holes and the connection process also related to the local plastic deformation.