Loading rate effect on inelastic deformation in a Zr-based bulk metallic glass

An experimental study of the inelastic deformation of bulk metallic glass Zr41.2Ti13.8Cu12.5Ni10Be22.5 under multiaxial compression using a confining sleeve technique is presented. In contrast to the catastrophic shear failure (brittle) in uniaxial compression, the metallic glass exhibited large inelastic deformation of more than 10% under confinement, demonstrating the nature of ductile deformation under constrained conditions in spite of the long-range disordered characteristic of the material. It was found that the metallic glass followed a pressure (p) dependent Tresca criterion τ = τ0 + βp, and the coefficient of the pressure dependence β was 0.17. Multiple parallel shear bands oriented at 45° to the loading direction were observed on the surfaces of the deformed specimens and were responsible for the overall inelastic deformation.

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Instrumented indentation of a Pd-based bulk metallic glass: Constant loading-rate test vs constant strain-rate test

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2008.07.163 ◽

2009 ◽

Vol 483 (1-2) ◽

pp. 136-138 ◽

Cited By ~ 9

Author(s):

Byung-Gil Yoo ◽

Kyung-Woo Lee ◽

Jae-il Jang

Keyword(s):

Metallic Glass ◽

Strain Rate ◽

Bulk Metallic Glass ◽

Loading Rate ◽

Constant Strain Rate ◽

Instrumented Indentation ◽

Constant Loading ◽

Rate Test ◽

Constant Loading Rate

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Indentation Deformation of a Cu47.5Zr19Hf28.5Al5 Bulk-Metallic Glass-Matrix Nanocomposite

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.16954 ◽

2020 ◽

Vol 20 (3) ◽

pp. 1530-1539

Author(s):

Yuan Sun ◽

Dong Zhang ◽

Shaojie Xin ◽

Fuqian Yang

Keyword(s):

Metallic Glass ◽

Bulk Metallic Glass ◽

Matrix Composite ◽

Vickers Hardness ◽

Glass Matrix ◽

Indentation Depth ◽

Loading Rate ◽

Indentation Load ◽

Glass Matrix Composite ◽

Metallic Glass Matrix Composite

In this work, we study the indentation deformation of a Cu47.5Zr19Hf28.5Al5 bulk-metallic glass-matrix composite and characterize the effects of the indentation-loading rate and the holding time at the peak-indentation load. For the same peak-indentation load, increasing the holding time and/or decreasing the indentation-loading rate cause the increase of the indentation depth. There exists the “bulge” of the unloading curve at the onset of the unloading for small indentation-loading rates. The Vickers hardness is a monotonically increasing function of the indentation-loading rate for the same peak-indentation load. For the indentations with the same loading and unloading time of 30 s and without an intermediate stage at the peak-indentation load, the Vickers hardness of the Cu47.5Zr19Hf28.5Al5 bulk-metallic glass-matrix composite decreases with the increase of the indentation load. The strain energy dissipated through plastic deformation during the indentation is a power-law function of the indentation load with a power index of 3/2, and the energy ratio (total energy/plastic energy) linearly increases with the depth ratio (residual indentation depth/maximum indentation depth).

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Nanoindentation study of size effect and loading rate effect on mechanical properties of a thin film metallic glass Cu49.3Zr50.7

Physica B Condensed Matter ◽

10.1016/j.physb.2011.10.050 ◽

2012 ◽

Vol 407 (3) ◽

pp. 340-346 ◽

Cited By ~ 25

Author(s):

Jian-Jun Pang ◽

Ming-Jen Tan ◽

K.M. Liew ◽

Christopher Shearwood

Keyword(s):

Thin Film ◽

Mechanical Properties ◽

Metallic Glass ◽

Size Effect ◽

Loading Rate ◽

Rate Effect

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Strain rate dependence of plastic flow in Ce-based bulk metallic glass during nanoindentation

Journal of Materials Research ◽

10.1557/jmr.2007.0039 ◽

2007 ◽

Vol 22 (2) ◽

pp. 258-263 ◽

Cited By ~ 30

Author(s):

B.C. Wei ◽

L.C. Zhang ◽

T.H. Zhang ◽

D.M. Xing ◽

J. Das ◽

...

Keyword(s):

Plastic Deformation ◽

Metallic Glass ◽

Strain Rate ◽

Bulk Metallic Glass ◽

Loading Rate ◽

Shear Banding ◽

Rate Dependence ◽

Strain Rate Dependence ◽

Serrated Flow ◽

Rate Dependent

The strain rate dependence of plastic deformation of Ce60Al15Cu10Ni15 bulk metallic glass was studied by nanoindentation. Even though the ratio of room temperature to the glass transition temperature was very high (0.72) for this alloy, the plastic deformation was dominated by shear banding under nanoindentation. The alloy exhibited a critical loading rate dependent serrated flow feature. That is, with increasing loading rate, the alloy exhibited a transition from less prominent serrated flow to pronounced serrated flow during continuous loading but from serrated to smoother flow during stepped loading.

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