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. 2019 Jan 24;9:504. doi: 10.1038/s41598-018-37052-1

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Formation and microstructure of heterogeneous Al/PI interface. (a) Proposed mechanism for the formation of a heterogeneous Al/PI interface through dehydration reaction at 150 °C. (b) High-resolution TEM image of the as-bonded Al/PI interface after bonding at 150 °C for 10 min. Diffraction patterns of the Al matrix and the interface reveal that the interface, where some new fine crystals are formed, grew after crystal orientation of the Al matrix. (c) and (d) show the interfacial microstructure after storage at room temperature for 3 and 6 months, respectively. The symbols ▲ and point out the initial interface where Al and PI surfaces were brought into contact and the Al/PI interfacial region, respectively.

Inline graphic — Formation and microstructure of heterogeneous Al/PI interface. (a) Proposed mechanism for the formation of a heterogeneous Al/PI interface through dehydration reaction at 150 °C. (b) High-resolution TEM image of the as-bonded Al/PI interface after bonding at 150 °C for 10 min. Diffraction patterns of the Al matrix and the interface reveal that the interface, where some new fine crystals are formed, grew after crystal orientation of the Al matrix. (c) and (d) show the interfacial microstructure after storage at room temperature for 3 and 6 months, respectively. The symbols ▲ and point out the initial interface where Al and PI surfaces were brought into contact and the Al/PI interfacial region, respectively.