Investigating fracture of nanoscale metal–ceramic multilayers in the transmission electron microscope
Investigating fracture of nanoscale metal–ceramic multilayers in the transmission electron microscope
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DOI：
10.1016/j.scriptamat.2015.12.026
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发表时间：
2016-04
影响因子：
6
通讯作者：
A. Kelling;K. R. Mangipudi;I. Knorr;T. Liese;H. Krebs;C. Volkert
中科院分区：
文献类型：
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作者：
A. Kelling;K. R. Mangipudi;I. Knorr;T. Liese;H. Krebs;C. Volkert
用透射电子显微镜原位观察了Ti/ZrO 2多层膜界面裂纹的扩展。裂纹沿沿着100 nm厚的多晶Ti层的中间扩展，引起广泛的位错活动、空隙聚结和裂纹桥接。塑性区的大小已被确定从位错活动的范围内，并同意从测得的裂纹尖端张开位移获得的韧性的估计。的韧性是远远小于散装钛，我们归因于位错活动和剪切的塑性区的小Ti层尺寸的约束。
In-situ transmission electron microscopy is used to investigate crack propagation parallel to the interfaces of a Ti/ZrO2multilayer. The cracks propagate along the middle of the 100 nm thick polycrystalline Ti layers, causing extensive dislocation activity, void coalescence, and crack bridging. The plastic zone size has been determined from the range of dislocation activity and agrees well with estimates of the toughness obtained from the measured crack tip opening displacement. The toughness is much smaller than in bulk Ti, which we attribute to the constraint on dislocation activity and cropping of the plastic zone by the small Ti layer dimensions.