Identifying the origin of strain rate sensitivity in a high entropy bulk metallic glass

2019 ◽  
Vol 164 ◽  
pp. 121-125 ◽  
Author(s):  
Qing Zhou ◽  
Yin Du ◽  
Weichao Han ◽  
Yue Ren ◽  
Haimin Zhai ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
High Entropy

scholarly journals Negative Strain Rate Sensitivity Induced by Structure Heterogeneity in Zr64.13Cu15.75Ni10.12Al10 Bulk Metallic Glass

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 339
Author(s):  
Xiang Wang ◽  
Zhi Qiang Ren ◽  
Wei Xiong ◽  
Si Nan Liu ◽  
Ying Liu ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Strain Rate Sensitivity ◽  
Critical Role ◽  
Rate Sensitivity ◽  
Confined Compression ◽  
Negative Strain Rate Sensitivity ◽  
Cast Specimen ◽  
Structure Heterogeneity

The negative strain rate sensitivity (SRS) of metallic glasses is frequently observed. However, the physical essence involved is still not well understood. In the present work, small-angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (HRTEM) reveal the strong structure heterogeneity at nanometer and tens of nanometer scales, respectively, in bulk metallic glass (BMG) Zr64.13Cu15.75Ni10.12Al10 subjected to fully confined compression processing. A transition of SRS of stress, from 0.012 in the as-cast specimen to −0.005 in compression processed specimen, was observed through nanoindentation. A qualitative formulation clarifies the critical role of internal stress induced by structural heterogeneity in this transition. It reveals the physical origin of this negative SRS frequently reported in structurally heterogeneous BMG alloys and its composites.

Structural features and high quasi-static strain rate sensitivity of Au49Cu26.9Ag5.5Pd2.3Si16.3 bulk metallic glass

2012 ◽  
Vol 101 (24) ◽  
pp. 241905 ◽  
Author(s):  
S. V. Ketov ◽  
N. Chen ◽  
A. Caron ◽  
A. Inoue ◽  
D. V. Louzguine-Luzgin
Keyword(s):  
Metallic Glass ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Structural Features ◽  
Static Strain

Indentation Strain Rate Sensitivity of CoCrFeNiAl0.3 High-Entropy Alloy

2018 ◽  
Vol 21 (2) ◽  
pp. 1800744 ◽  
Author(s):  
Ji Qiu ◽  
Gesheng Xiao ◽  
Tao Jin ◽  
Buyun Su ◽  
Xuefeng Shu ◽  
...  
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Indentation Strain
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