Liquid-Like, Self-Healing Aluminum Oxide during Deformation at Room Temperature

Nano Letters
Yang YangJu Li

Abstract

Effective protection from environmental degradation relies on the integrity of oxide as diffusion barriers. Ideally, the passivation layer can repair its own breaches quickly under deformation. While studies suggest that the native aluminum oxide may manifest such properties, it has yet to be experimentally proven because direct observations of the air-environmental deformation of aluminum oxide and its initial formation at room temperature are challenging. Here, we report in situ experiments to stretch pure aluminum nanotips under O2 gas environments in a transmission electron microscope (TEM). We discovered that aluminum oxide indeed deforms like liquid and can match the deformation of Al without any cracks/spallation at moderate strain rate. At higher strain rate, we exposed fresh metal surface, and visualized the self-healing process of aluminum oxide at atomic resolution. Unlike traditional thin-film growth or nanoglass consolidation processes, we observe seamless coalescence of new oxide islands without forming any glass-glass interface or surface grooves, indicating greatly accelerated glass kinetics at the surface compared to the bulk.

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Citations

Nov 16, 2019·Science·Erkka J FrankbergKarine Masenelli-Varlot
May 24, 2019·Frontiers in Chemistry·Tilmann LeisegangDirk C Meyer
Jul 11, 2021·Science Advances·Wei YangHai-Jun Jin
Jul 10, 2018·ACS Applied Materials & Interfaces·Chen ZhaoJimi Tjong
Sep 14, 2019·ACS Applied Materials & Interfaces·Kehang Cui, Brian L Wardle

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