Al-TiN纳米复合材料中塑性共变形的原位纳米压痕研究

Li N, Wang H, Misra A, Wang J

Materials Physics and Applications Division, MPA-CINT, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Materials Science and Technology Division, MST-8, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Sci Rep. 2014 Oct 16;4:6633. doi: 10.1038/srep06633.

We performed in situ indentation in a transmission electron microscope on Al-TiN multilayers with individual layer thicknesses of 50 nm, 5 nm and 2.7 nm to explore the effect of length scales on the plastic co-deformability of a metal and a ceramic. At 50 nm, plasticity was confined to the Al layers with easy initiation of cracks in the TiN layers. At 5 nm and below, cracking in TiN was suppressed and post mortem measurements indicated a reduction in layer thickness in both layers. The results demonstrate the profound size effect in enhancing plastic co-deformability in nanoscale metal-ceramic multilayers.

我们在透射电子显微镜中对单层厚度分别为50纳米、5纳米和2.7纳米的铝-氮化钛多层膜进行了原位压痕试验，以探究长度尺度对金属与陶瓷塑性共变形能力的影响。在50纳米时，塑性变形局限于铝层，氮化钛层容易出现裂纹。在5纳米及以下时，氮化钛层的裂纹受到抑制，事后测量表明两层的层厚均减小。结果证明了纳米尺度金属-陶瓷多层膜在增强塑性共变形能力方面存在显著的尺寸效应。