Deformation behavior and indentation size effect of Au49Ag5.5Pd2.3Cu26.9Si16.3 bulk metallic glass at elevated temperatures

2009 ◽  
Vol 17 (4) ◽  
pp. 227-230 ◽  
Author(s):  
N. Li ◽  
L. Liu ◽  
K.C. Chan ◽  
Q. Chen ◽  
J. Pan
Keyword(s):  
Metallic Glass ◽  
Size Effect ◽  
Bulk Metallic Glass ◽  
Deformation Behavior ◽  
Elevated Temperatures ◽  
Indentation Size Effect ◽  
Indentation Size

Indentation size effect in bulk metallic glass

2011 ◽  
Vol 64 (8) ◽  
pp. 753-756 ◽  
Author(s):  
Jae-il Jang ◽  
Byung-Gil Yoo ◽  
Yong-Jae Kim ◽  
Jun-Hak Oh ◽  
In-Chul Choi ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Size Effect ◽  
Bulk Metallic Glass ◽  
Indentation Size Effect ◽  
Indentation Size

scholarly journals Indentation creep of a Ti-based metallic glass

2009 ◽  
Vol 24 (3) ◽  
pp. 993-997 ◽  
Author(s):  
Y.J. Huang ◽  
Y.L. Chiu ◽  
J. Shen ◽  
J.J.J. Chen ◽  
J.F. Sun
Keyword(s):  
Metallic Glass ◽  
Size Effect ◽  
Stress Exponent ◽  
Deformation Behavior ◽  
Room Temperature ◽  
Bulk Sample ◽  
Indentation Creep ◽  
Indentation Size ◽  
Plastic Deformation Behavior ◽  
Measured Stress

In this work, the time-dependent plastic deformation behavior of Ti40Zr25Ni3Cu12Be20 bulk and ribbon metallic glass alloys was investigated using a nanoindentation technique at room temperature with the applied load ranging from 5 to 100 mN. The stress exponent n, defined as, has been derived as a measure of the creep resistance. It was found that the measured stress exponent increases rapidly with increasing indentation size, exhibiting a positive size effect. The size effect on the stress exponent n obtained from the bulk sample is more pronounced than that obtained from the ribbon sample. The deformation mechanism involved will be discussed.

scholarly journals Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based Nanoglasses

2021 ◽  
Vol 8 ◽  
Author(s):  
A Sharma ◽  
Sree Harsha Nandam ◽  
Horst Hahn ◽  
K. Eswar Prasad
Keyword(s):  
Size Effect ◽  
Structural Relaxation ◽  
Deformation Behavior ◽  
Indentation Size Effect ◽  
Shear Bands ◽  
Amorphous Structure ◽  
Indentation Load ◽  
Indentation Size ◽  
Show Evidence ◽  
Micro Indentation

In this work, the deformation behavior of as-prepared (AP) and structurally relaxed (SR) Cu–Zr–based nanoglasses (NGs) are investigated using nano- and micro-indentation. The NGs are subjected to structural relaxation by annealing them close to the glass transition temperature without altering their amorphous nature. The indentation load, p, vs. displacement, h, curves of SR samples are characterized by discrete displacement bursts, while the AP samples do not show any of them, suggesting that annealing has caused a local change in the amorphous structure. In both the samples, hardness (at nano- and micro-indentation) decreases with increasing p, demonstrating the indentation size effect. The micro-indentation imprints of SR NGs show evidence of shear bands at the periphery, indicating a heterogeneous plastic flow, while AP NG does not display any shear bands. Interestingly, the shear band density decreases with p, highlighting the fact that plastic strain is accommodated entirely by the shear bands in the subsurface deformation zone. The results are explained by the differences in the amorphous structure of the two NGs.

Deformation behavior and indentation size effect in amorphous and crystallized Pd40Cu30Ni10P20 alloy

2009 ◽  
Vol 24 (5) ◽  
pp. 1693-1699 ◽  
Author(s):  
N. Li ◽  
L. Liu ◽  
K.C. Chan
Keyword(s):  
Amorphous Alloy ◽  
Size Effect ◽  
Deformation Behavior ◽  
Indentation Depth ◽  
Indentation Size Effect ◽  
Indentation Hardness ◽  
Indentation Size ◽  
Surface Residual Stress ◽  
Deformation Behaviors ◽  
The Difference

The deformation behavior and indentation size effect (ISE) in amorphous and crystallized Pd40Cu30Ni10P20 alloy were comparatively studied through instrumented nanoindentation. It was found that the two alloys showed different deformation behaviors, the amorphous alloy exhibited conspicuous pop-in events in the load-depth (P-h) curve, while the crystallized alloy showed a relatively smooth P-h curve. In addition, the indentation hardness was observed to decrease with increasing penetration depth in the two alloys, exhibiting a significant ISE. However, the crystallized alloy displayed a sharper reduction of hardness with indentation depth as compared to the amorphous alloy, indicating a more significant indentation size effect in the crystalline alloy. The structure difference and friction factor associated with the surface residual stress are taken into account to interpret the difference in the deformation behavior and indentation size effect of the two alloys.

Indentation behavior of a ZCAP-3 bulk metallic glass: Effects of the fatigue deformation

2009 ◽  
Vol 24 (7) ◽  
pp. 2346-2352 ◽  
Author(s):  
Fuqian Yang ◽  
Hongmei Dang ◽  
Gongyao Wang ◽  
Yoshihiko Yokoyama ◽  
Peter K. Liaw
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Indentation Size Effect ◽  
Local Heating ◽  
Shear Bands ◽  
Indentation Hardness ◽  
Indentation Size ◽  
Localized Deformation ◽  
Damaged Zone ◽  
Fatigue Deformation

The effects of the fatigue deformation on the localized deformation of a ZCAP-3 bulk metallic glass (BMG) were studied using the nanoindentation technique. A localized mechanical hardening was observed in the ZCAP-3 BMG between the shear bands in the fatigue-damaged zone. In contrast to the indentations of the BMG made far away from the fatigue-damaged zone, there was no indentation size effect. Both the reduced contact modulus and the indentation hardness were larger than those corresponding to the indentations of the ZCAP-3 BMG in the undamaged zone. These observations revealed the possible effects of local heating and stress-induced atomic rearrangements (i.e., inelastic deformation) on the reduction of the free volume in the BMG from the propagation of the fatigue crack.

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