Ductile to brittle transition of fracture of a Zr-based bulk metallic glass: Strain rate effect

2016 ◽  
Vol 77 ◽  
pp. 34-40 ◽  
Author(s):  
M.C. Li ◽  
M.Q. Jiang ◽  
G. Li ◽  
L. He ◽  
J. Sun ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Brittle Transition ◽  
Ductile To Brittle Transition

Ductile-to-brittle transition in a Ti-based bulk metallic glass

2009 ◽  
Vol 60 (11) ◽  
pp. 1027-1030 ◽  
Author(s):  
X.J. Gu ◽  
S.J. Poon ◽  
G.J. Shiflet ◽  
J.J. Lewandowski
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Brittle Transition ◽  
Ductile To Brittle Transition

scholarly journals Strain Rate Effect on the Ductile Brittle Transition in Grinding Hot Pressed SiC Ceramics

Micromachines ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 545
Author(s):  
Pai Huang ◽  
Jiaqi Zhang
Keyword(s):  
Strain Rate ◽  
Material Removal ◽  
Subsurface Damage ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Critical Depth ◽  
Removal Mechanism ◽  
Brittle Transition ◽  
Sic Ceramics ◽  
Damage Depth

Surface and subsurface damage are still persistent technical challenges for the abrasive machining hot pressed-silicon carbide (HP-SiC) ceramics. Therefore, an investigation of the material behavior and critical depth of ductile to brittle transition (DBT) is essential for improving high precision and quality grinding HP-SiC ceramics. In this paper, single-grit grinding experiments with different scratch speed were conducted to study strain rate effect on the critical depth of DBT. The nanoindentations were performed to test the hardness and Young’s modulus changes of DBT position under different scratch speeds. The material removal mechanism and phase changes underneath the scratch groove were investigated using Raman tests. Based on the specific energies consumed in ductile and brittle modes of machining, a theoretical model of the critical depth of DBT was developed. The experimental results suggest that high scratch speeds generate high nanohardness, high Young‘s modulus and high critical depth of DBT of HP-SiC ceramics. The measured critical depth of DBT shows a good agreement with the predicted value calculated by the developed model. The subsurface damage depth reduced with high strain rate. Furthermore, the Raman results revealed that dislocations and amorphous transformation dominated the ductile removal mechanism of HP-SiC grinding. The fracture chips and subsurface damage depth was determined by the lateral crack and median crack, respectively. This paper’s results provide a fundamental understanding of the effect of grinding speed on the material removal mode of HP-SiC ceramics.

scholarly journals Ductile to brittle transition in dynamic fracture of brittle bulk metallic glass

2008 ◽  
Vol 103 (9) ◽  
pp. 093520 ◽  
Author(s):  
G. Wang ◽  
Y. N. Han ◽  
X. H. Xu ◽  
F. J. Ke ◽  
B. S. Han ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Dynamic Fracture ◽  
Brittle Transition ◽  
Ductile To Brittle Transition

Strain rate effect on metallic glass ductility

2004 ◽  
Vol 50 (10) ◽  
pp. 1303-1307 ◽  
Author(s):  
A.V. Sergueeva ◽  
N.A. Mara ◽  
D.J. Branagan ◽  
A.K. Mukherjee
Keyword(s):  
Metallic Glass ◽  
Strain Rate ◽  
Strain Rate Effect ◽  
Rate Effect

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.

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