Self-repair by stress-induced diffusion of noble elements during oxidation of Zr48Cu36Al8Ag8 bulk metallic glass

SCRIPTA MATERIALIA

卷:164

Article

Haratian, Saber¹  Grumsen, Flemming B.¹  Villa, Matteo¹  Christiansen, Thomas L.¹  Somers, Marcel A. J.¹ 

[1] Tech Univ Denmark, Dept Mech Engn, Prod Storvet B 425, DK-2800 Lyngby, Denmark

关键词: Zr-Cu-Al-Ag BMG;    Long-term oxidation behavior;    In-situ X-ray diffraction;    Oxide zones characterization;   

DOI  :  10.1016/j.scriptamat.2019.01.045

来源: Elsevier

【 摘 要 】

Long-term oxidation behavior of Zr48Cu36Al8Ag8 BMG under atmospheric conditions at 600 K was investigated using in-situ X-ray diffraction analysis. Two oxide zones develop: an outer oxide zone (OOZ), consisting of a stratified distribution of CuOx, Ag, and ZrO2, and an inner oxide zone (IOZ) consisting of tetragonal ZrO2 showing Cu-enriched lines inclined to the surface. The stratified microstructure in the OOZ and the Cu enrichments in the IOZ are ascribed to micro-cracks resulting from the compressive stresses induced by ZrO2 formation. Segregation of noble elements towards these oxidation-generated free surfaces repairs the micro-cracks and can consistently explain the microstructural features. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free