Influence of thin-film metallic glass coating on fatigue behavior of bulk metallic glass: Experiments and finite element modeling
Influence of thin-film metallic glass coating on fatigue behavior of bulk metallic glass: Experiments and finite element modeling
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DOI：
10.1016/j.msea.2017.03.071
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发表时间：
2017-04
期刊：
影响因子：
6.4
通讯作者：
Chia-Chi Yu;J. Chu;H. Jia;Yu‐Lin Shen;Yanfei Gao;P. Liaw;Y. Yokoyama
中科院分区：
文献类型：
--
作者：
Chia-Chi Yu;J. Chu;H. Jia;Yu‐Lin Shen;Yanfei Gao;P. Liaw;Y. Yokoyama
在Zr50Cu30Al10Ni10大块金属玻璃(BMG)上沉积了一层锆基薄膜金属玻璃(TFMG)，研究了四点弯曲疲劳试验中剪切带的演化规律。TFMG涂层试件的疲劳极限比BMG试件提高约33%。有限元模拟结果表明，在循环载荷作用下，TFMG涂层试件中剪切带的形核和扩展具有延迟性。球形压痕的有限元研究表明，TFMG涂层的应力重分布阻止了BMG衬底上的局部剪切带。BMG基材疲劳性能的提高可以归因于TFMG涂层延缓了BMG表面缺陷处剪切带的萌生。
A coating of the Zr-based thin-film metallic glass (TFMG) was deposited on the Zr50Cu30Al10Ni10bulk metallic glass (BMG) to investigate shear-band evolution under four-point-bend fatigue testing. The fatigue endurance-limit of the TFMG-coated samples is ~ 33% higher than that of the BMG. The results of finite-element modeling (FEM) revealed a delay in the shear-band nucleation and propagation in TFMG-coated samples under applied cyclic-loading. The FEM study of spherical indentation showed that the redistribution of stress by the TFMG coating prevents localized shear-banding in the BMG substrate. The enhanced fatigue characteristics of the BMG substrates can be attributed to the TFMG coatings retarding shear-band initiation at defects on the surface of the BMG.