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Heterophase interface-mediated formation of nanotwins and 9R phase in aluminum: Underlying mechanisms and strengthening effect
发布时间：2025-04-30
- 论文名称：
- Heterophase interface-mediated formation of nanotwins and 9R phase in aluminum: Underlying mechanisms and strengthening effect
- 发表刊物：
- Acta Materialia
- 摘要：
- Nanostructured crystalline Al/amorphous AlN multilayer films with a wide layer thickness (h) range from
~10 nm up to ~200 nm were prepared by using magnetron sputtering. Nanotwins and 9R phase were
substantially observed in the Al layers, showing a strong thickness dependence. The 9R phase pre-
dominantly penetrated through the Al layer in the II regime of h ? ~20 nm, while mainly terminated
within the layer interior in the I regime of h > ~20 nm. On the contrary, the coherent nanotwins were
boosted when h > ~20 nm and the percentage of twinned Al grains was greatly increased. The formation
mechanisms of 9R phase and coherent nanotwins were discussed in terms of the interfacial chemistry/
physics modulated by the amorphous AlN layers, which displayed gradient characteristics and hence was
sensitive to the layer thickness. A significant thickness dependence of hardness was also evident that the
hardness monotonically increased with reducing h in the I regime, while reached a peak value and hold
almost unchanged in the II regime. The hardness in the II regime is about 1GPa greater than the pre-
dictions from an interfacial barrier crossing model. This discrepancy is mainly contributed by the layer-
penetrating 9R phase rather than the nanotwins. This study provides a new perspective on fabricating
nanotwinned Al by utilizing heterophase interfaces
- 合写作者：
- J.D. Zuo, C. He, M. Cheng, K. Wu, Y.Q. Wang, J.Y. Zhang , G. Liu , J. Sun
- 卷号：
- 174 (2019) 279e288
- 页面范围：
- 174 (2019) 279e288
- 是否译文：
- 否
- 发表时间：
- 2019-05-29
