Multilayered scale formation during Zr-based metallic glass oxidation in the supercooled liquid region

作者：Zhang, Mao; Deng, Lei; Yao, Di; Jin, Junsong; Wang, Xinyun^*

来源：Corrosion Science, 2016, 111: 556-567.

DOI：10.1016/j.corsci.2016.05.044

• Glass
• Alloy
• STEM
• SEM
• Oxidation
• Interfaces

During the oxidation of Zr55Cu30Al10Ni5 metallic glass in its supercooled liquid region, multilayered scale structures were found. An amorphous oxide layer forms first, beneath which, a layer of t-ZrO2 columnar dendrites nucleate and grow into the supercooled amorphous substrate. After the substrate fully crystallizes, a layer of flaky t-ZrO2 grains forms beneath the columnar dendrite layer. The continuous outward diffusion of Cu2+ cations from the grain boundaries of columnar grains results in interconnected fissures inside this layer, which provide pathways for gaseous O-2 transportation. Thus, another distinguishable layer is generated between the columnar grain layer and the flaky grain layer.

• 出版日期2016-10
• 单位华中科技大学