Shear transformation zones structure characterization in Cu50Zr50 metallic glasses under tensile test

2020 ◽  
Vol 184 ◽  
pp. 109941 ◽  
Author(s):  
Nicolás Amigo ◽  
Felipe Urbina ◽  
Felipe Valencia
Keyword(s):  
Tensile Test ◽  
Metallic Glasses ◽  
Structure Characterization ◽  
Shear Transformation ◽  
Shear Transformation Zones

Stimulation of shear-transformation zones in metallic glasses by cryogenic thermal cycling

2020 ◽  
Vol 548 ◽  
pp. 120299 ◽  
Author(s):  
C.M. Meylan ◽  
F. Papparotto ◽  
S. Nachum ◽  
J. Orava ◽  
M. Miglierini ◽  
...  
Keyword(s):  
Thermal Cycling ◽  
Metallic Glasses ◽  
Shear Transformation ◽  
Shear Transformation Zones ◽  
Stimulation Of

scholarly journals Controlling shear band instability by nanoscale heterogeneities in metallic nanoglasses

2021 ◽  
Author(s):  
Sree Harsha Nandam ◽  
Ruth Schwaiger ◽  
Aaron Kobler ◽  
Christian Kübel ◽  
Chaomin Wang ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Yield Strength ◽  
Shear Band ◽  
Metallic Glasses ◽  
Strain Localization ◽  
Catastrophic Failure ◽  
Compression Tests ◽  
Medium Range ◽  
Shear Transformation ◽  
Shear Transformation Zones

Abstract Strain localization during plastic deformation drastically reduces the shear band stability in metallic glasses, ultimately leading to catastrophic failure. Therefore, improving the plasticity of metallic glasses has been a long-standing goal for several decades. In this regard, nanoglass, a novel type of metallic glass, has been proposed to exhibit differences in short and medium range order at the interfacial regions, which could promote the formation of shear transformation zones. In the present work, by introducing heterogeneities at the nanoscale, both crystalline and amorphous, significant improvements in plasticity are realized in micro-compression tests. Both amorphous and crystalline dispersions resulted in smaller strain bursts during plastic deformation. The yield strength is found to increase significantly in Cu–Zr nanoglasses compared to the corresponding conventional metallic glasses. The reasons for the mechanical behavior and the importance of nanoscale dispersions to tailor the properties is discussed in detail. Graphic Abstract

scholarly journals Probe Embryonic Damage Evolution in Bulk Metallic Glasses under Plate-impact Loading

2018 ◽  
Vol 183 ◽  
pp. 03013
Author(s):  
Zhong Ling ◽  
Xin Huang ◽  
Lanhong Dai
Keyword(s):  
Metallic Glass ◽  
Metallic Glasses ◽  
Volume Content ◽  
Impact Loading ◽  
Damage Evolution ◽  
Ductile Damage ◽  
Plate Impact ◽  
Shear Transformation ◽  
Stress Environment ◽  
Shear Transformation Zones

Microdamage in very short stress durations of spallation process in Zr-based bulk metallic glass (Zr-BMG) samples were captured by a specially designed plate impact technique. With stress durations vary, microdamage “frozen” in Zr-BMG samples exhibited different damage levels. Based on the morphology and stress environment of the microdamage, a compound microdamage evolution mode is applied to characterize the spallation evolution in Zr-BMGs. Especially the spallation in BMGs originates from cavitation instabilities in the weak regions with higher free volume content, which results in formation of ductile damage zones. The activation of shear transformation zones (STZs) or tension transformation zones (TTZs) between these ductile damage zones finally leads to detached spallation.

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