摘要
Oxidation of metallic glasses has been shown to be different from crystalline alloys due to the disordered atomic structures and far-from-equilibrium state,and quick characterization is required to reveal their early stage oxidation.In this study,we investigated the oxidation behavior of a Zr_(46)Cu_(46)Al_(7)Gd_(1)bulk metallic glass by measuring the changes of optical constants via spectroscopic ellipsometry.Characterizations with X-ray diffraction,scanning electron microscopy,and thermogravimetric analyzer confirmed that the changes of pseudo-optical constants reflected not only the onset temperature at which the alloys underwent obvious oxidation,but also the subtle oxidation which was tedious to characterize.Our study suggests a more efficient and accurate approach to understand the oxidation of metallic glasses with temperature,time and compositions.
相比于晶态合金,非晶合金表现出显著不同的氧化行为,其氧化过程受无序原子结构和非平衡状态的影响.为揭示非晶合金的早期氧化过程,需要对其氧化行为进行快速表征.本文以Zr_(46)Cu_(46)Al_(7)Gd_(1)块体非晶合金为对象,通过测量光学常数的变化对氧化行为进行表征.与X射线衍射、扫描电子显微镜和热重分析测得的结果相比,光学常数不仅可以反映非晶合金发生明显氧化的起始温度,还可以反映难以用传统方法表征的早期氧化过程.本研究结果说明光学常数是反映氧化行为的灵敏参数,将有助于认识非晶合金氧化过程随温度、时间和组分变化的演化过程.
作者
Weijie Xie
Mingxing Li
Jiashu Cao
Liwei Hu
Chao Wang
Wei-Hua Wang
Yanhui Liu
谢桅杰;李明星;曹家树;胡立威;王超;汪卫华;柳延辉(Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing 100083,China)
基金
the National Key Research and Development Program of China(2018YFA0703600 and2017YFB0701900)
the National Natural Science Foundation of China(51825104,51801095,11790291 and 61888102)
CAS projects(XDB30000000)
the Key Basic and Applied Research Program of Guangdong Province of China(2019B030302010)。
