Effect of Hydrogen Charging on Pop-in Behavior of a Zr-Based Metallic Glass
Effect of Hydrogen Charging on Pop-in Behavior of a Zr-Based Metallic Glass
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DOI：
10.3390/met10010022
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发表时间：
2019-12
期刊：
影响因子：
2.9
通讯作者：
L. Tian;D. Tönnies;Moritz Hirsbrunner;T. Sievert;Z. Shan;C. Volkert
中科院分区：
文献类型：
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作者：
L. Tian;D. Tönnies;Moritz Hirsbrunner;T. Sievert;Z. Shan;C. Volkert
本文通过对充氢金属玻璃的结构和力学性能的研究，探讨了氢对早期塑性的影响。采用电化学充电法将氢引入锆基（Vit105）金属玻璃样品中。纳米压痕测试揭示了一个明显的增加，在模量和硬度，以及在第一弹出的负载随着氢含量的增加。同时，发生爆裂的概率降低，表明氢阻碍了塑性不稳定性的发生，同时允许局部均匀变形。氢诱导的硬化和硬化是合理的氢稳定的剪切转变区（STZs）的非晶结构，而改善的延展性是由于STZs的空间相关性的变化。
In this work, structural and mechanical properties of hydrogen-charged metallic glass are studied to evaluate the effect of hydrogen on early plasticity. Hydrogen is introduced into samples of a Zr-based (Vit 105) metallic glass using electrochemical charging. Nanoindentation tests reveal a clear increase in modulus and hardness as well as in the load of the first pop-in with increasing hydrogen content. At the same time, the probability of a pop-in occurring decreases, indicating that hydrogen hinders the onset of plastic instabilities while allowing local homogeneous deformation. The hydrogen-induced stiffening and hardening is rationalized by hydrogen stabilization of shear transformation zones (STZs) in the amorphous structure, while the improved ductility is attributed to the change in the spatial correlation of the STZs.