Effect of Hydrogen Charging on Pop-in Behavior of a Zr-Based Metallic Glass

Metals

CynthiaA. Volkert¹  Zhiwei Shan²  Lin Tian³  Moritz Hirsbrunner³  Tim Sievert³  Dominik Tönnies³ 

[1] Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;;Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) &Institute of Materials Physics, University of Göttingen, 37077 Göttingen, Germany;

关键词: metallic glass;    hydrogen;    indentation;    pop-in;    plasticity;   

DOI  :  10.3390/met10010022

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown