Natural aging of Ni60Nb40 metallic glass thin film: Evolution of microstructure and mechanical properties
Natural aging of Ni60Nb40 metallic glass thin film: Evolution of microstructure and mechanical properties
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Ni60Nb40 金属玻璃薄膜的自然时效：微观结构和机械性能的演变
DOI：
10.1016/j.vacuum.2021.110441
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发表时间：
2021-10
期刊：
影响因子：
4
通讯作者：
Lin Chen
中科院分区：
文献类型：
--
作者：
M. Li;Dehong lu;Jun Tan;Lin Chen
摘要金属玻璃薄膜（MGTFs）通常在空气中使用，因此研究MGTFs暴露于空气中的结构、形貌和力学性能的演变对MGTFs的实际应用具有重要意义。本文通过实验和计算方法研究了氧化物的形成机理。结果表明，当暴露于空气中时，可以形成结晶氧化物NiNb2O6。氧化物的晶体结构为正交晶系，晶格常数为：a=14.022，B=5.675，c=5.015nm。氧化物NiNb2O6在自然时效期间在非晶岛状边界周围引发。非晶基体的岛状边界为晶态氧化物的形核和生长提供了条件。实验和第一性原理计算结果表明，NiNb2O6氧化物的平均杨氏模量和平均硬度远高于非晶态基体，表明晶态氧化物的存在可以提高薄膜的耐磨性能。
Abstract Since metallic glass thin films (MGTFs) are commonly used in the atmosphere of air, the study on the evolution of structure, morphology, and mechanical properties of MGTFs exposed to air is of great significance for the practical application of MGTFs. The oxide formation mechanisms are investigated by experimental and calculation methods in this work. The results indicated that the crystalline oxide NiNb2O6 can be formed when exposed to air. The crystal structure of the oxide is orthorhombic, and the lattice constants can be calculated as: a=14.022, b=5.675 and c=5.015nm. The oxide NiNb2O6 was initiated around the amorphous island-like boundary during natural aging. The island boundary of amorphous matrix can provide the formation condition of nucleation and growth for crystalline oxide. The averaged Young's modulus and hardness of NiNb2O6 oxide are much higher than that of the amorphous matrix based on the results of experiments and first-principle calculations, indicating that the presence of crystalline oxides might improve the wear-resistance performance of the films.
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