Instrumented indentation study of plastic deformation in bulk metallic glasses

2006 ◽  
Vol 21 (1) ◽  
pp. 75-81 ◽  
Author(s):  
W.H. Li ◽  
T.H. Zhang ◽  
D.M. Xing ◽  
B.C. Wei ◽  
Y.R. Wang ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Metallic Glasses ◽  
Deformation Behavior ◽  
Loading Rate ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Plastic Deformation Zone ◽  
Instrumented Indentation ◽  
Depth Sensing ◽  
Plastic Deformation Behavior

Mechanical properties and micro-plastic deformation behavior of five bulk metallic glasses (BMGs) were studied by instrumented indentation. These materials included La60Al10Ni10Cu20, Mg65Cu25Gd10, Zr52.5Al10Ni10Cu15Be12.5, Cu60Zr20Hf10Ti10, and Ni60Nb37Sn3 alloys. Remarkable difference in deformation behavior was found in the load–displacement curves of nanoindentation and pileup morphologies around the indents. Serrated plastic deformation depended on the loading rate was found in Mg-, Zr-, and Cu-based BMGs. The subsurface plastic deformation zone of typical alloys was investigated through bonded interface technique using depth-sensing microindentation. Large and widely spaced shear bands were observed in Mg-based BMG. The effect of loading rate on the indentation deformation behaviors in different BMGs was elucidated by the change of shear band pattern.

Effect of Cooling Rate, Tungsten Fiber Addition and Annealing on Deformation and Mechanical Properties of Zr-Based Bulk Metallic Glasses Under a Nanoindenter

2015 ◽  
Vol 1120-1121 ◽  
pp. 68-72
Author(s):  
Yi Si
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Cooling Rate ◽  
Metallic Glasses ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Tungsten Fiber ◽  
Nanoindentation Instrument ◽  
Scanning Electron ◽  
Fiber Addition

The deformation and mechanical properties of Zr-based bulk metallic glasses (BMGs) under a nanoindenter and the effect of cooling rate, the effect of cooling rate, tungsten fiber addition and annealing on them have been studied by means of a nanoindentation instrument and a scanning electron microscope (SEM). The results indicate that the deformation of Zr-based BMGs under a nanoindenter is characterized by multiple shear bands and viscous flow which confirms the existence of a amount of plastic deformation. For pure quenched Zr-based BMGs, the larger the size of samples or the nearer the location away from the surface of a same sample, the smaller the values of microhardness (Hv) and elastic modulus (E); Annealing and tungsten fiber addition enhance the values of Hv and E; meanwhile, they also significantly change morphology around a nanoindenter and the amount of plastic deformation. The mechanism of plastic deformation is preliminarily analyzed.

scholarly journals Plastic deformation in Ce-based bulk metallic glasses during depth-sensing indentation

2007 ◽  
Vol 449-451 ◽  
pp. 962-965 ◽  
Author(s):  
B.C. Wei ◽  
T.H. Zhang ◽  
L.C. Zhang ◽  
D.M. Xing ◽  
W.H. Li ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Depth Sensing

scholarly journals Plastic Dynamical Model for Bulk Metallic Glasses

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Shaowen Yao ◽  
Zhibo Cheng
Keyword(s):  
Metallic Glasses ◽  
Loading Rate ◽  
Testing Machine ◽  
Compressive Loading ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Experimental Results ◽  
Dynamical Model ◽  
Compression Tests ◽  
Rate Range

Based on previous experimental results of the plastic dynamic analysis of metallic glasses upon compressive loading, a dynamical model is proposed. This model includes the sliding speed of shear bands in the plastically strained metallic glasses, the shear resistance of shear bands, the internal friction resulting from plastic deformation, and the influences from the testing machine. This model analysis quantitatively predicts that the loading rate can influence the transition of the plastic dynamics in metallic glasses from chaotic (low loading rate range) to stable behavior (high loading rate range), which is consistent with the previous experimental results on the compression tests of a Cu50Zr45Ti5 metallic glass. Moreover, we investigate the existence of a nonconstant periodic solution for plastic dynamical model of bulk metallic glasses by using Manásevich–Mawhin continuation theorem.

scholarly journals Deformation Behavior of Bulk Metallic Glasses and High Entropy Alloys under Complex Stress Fields: A Review

Entropy ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 54 ◽  
Author(s):  
Shunhua Chen ◽  
Jingyuan Wang ◽  
Lei Xia ◽  
Yucheng Wu
Keyword(s):  
Plastic Deformation ◽  
Metallic Glasses ◽  
Deformation Behavior ◽  
Bulk Metallic Glasses ◽  
Complex Stress ◽  
Deformation Mechanisms ◽  
Stress Fields ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Stress States

The plastic deformation of bulk metallic glasses (BMGs) depends significantly on applied stress states, and more importantly, in practical applications of BMGs as structural materials, they always deform under complex stress fields. The understanding of deformation behavior of BMGs under complex stress fields is important not only for uncovering the plastic deformation mechanisms of BMGs, but also for developing BMG components with excellent mechanical performance. In this article, we briefly summarize the recent research progress on the deformation behavior of BMGs under complex stress fields, including the formation and propagation of shear bands, tunable macroscopic plasticity, and serrated plastic flows. The effect of complex stress fields on the plastic deformation mechanisms of BMGs is discussed from simple stress gradient to tailored complex stress fields. The deformation behavior of high entropy alloys (HEAs) under complex stress states has also been discussed. Challenges, potential implications and some unresolved issues are proposed.

Synergistic effect of crystalline metal on the plasticity of bulk metallic glasses under uniaxial synchro-compression

2009 ◽  
Vol 24 (10) ◽  
pp. 3099-3107 ◽  
Author(s):  
Zhen H. Han ◽  
Lin He ◽  
Ming B. Zhong ◽  
Feng Jiang ◽  
Jun Sun
Keyword(s):  
Plastic Deformation ◽  
Synergistic Effect ◽  
Deformation Behavior ◽  
Testing Machine ◽  
Shear Bands ◽  
Uniaxial Stress ◽  
Plastic Deformation Behavior ◽  
Metallic Ring ◽  
Inner Diameter ◽  
Crystalline Metal

A uniaxial synchro-compression test of a cylindrical bulk metallic glass (BMG) specimen along with a crystalline metallic ring having an inner diameter much larger than the specimen’s diameter and thereby without radial confinement on the BMG specimen was performed. The plastic deformation behavior of a conventional Zr65Cu17.5Ni10Al7.5 BMG under synchro-compression with a cupper ring was investigated. It was found that remarkably plastic deformation in the inherently brittle BMG could occur under the uniaxial stress state as the loading area of the cupper ring was sufficiently large, and multiplication of the shear band on the synergistically deformed BMG specimen could be accomplished. The synergistic effect of the crystalline metal on the plastic deformation behavior of the BMG was attributed to the reduced thermal softening extent inside the shear bands that resulted from the restraining effect of the copper ring on the spring-back action of the testing machine.

scholarly journals Investigation of Mechanical Properties and Plastic Deformation Behavior of (Ti45Cu40Zr10Ni5)100−xAlxMetallic Glasses by Nanoindentation

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Lanping Huang ◽  
Xuzhe Hu ◽  
TaoTao Guo ◽  
Song Li
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Elastic Modulus ◽  
Amorphous Alloy ◽  
Deformation Behavior ◽  
Alloy Composition ◽  
Loading Rate ◽  
Al Content ◽  
Plastic Deformation Behavior ◽  
Al Addition

The effect of Al addition on mechanical properties and plastic deformation behavior of (Ti45Cu40Zr10Ni5)100−xAlx(x= 0, 2, 4, 6 and 8) amorphous alloy ribbons have been investigated by nanoindentation. The hardness and elastic modulus do not simply increase with the increase of Al content. The alloy with 8 at.% Al exhibits the highest hardness and elastic modulus. The serrations or pop-in events are strongly dependent on the loading rate and alloy composition.

Initial plasticity onset in Zr- and Hf-rich bulk metallic glasses during instrumented indentation

2007 ◽  
Vol 22 (5) ◽  
pp. 1265-1269 ◽  
Author(s):  
Tyler D. Krus ◽  
Thomas F. Juliano ◽  
Laszlo J. Kecskes ◽  
Mark R. VanLandingham
Keyword(s):  
Plastic Deformation ◽  
Metallic Glass ◽  
Energy Loss ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Deformation Energy ◽  
Strain Rates ◽  
Instrumented Indentation ◽  
Volume Energy ◽  
Load Intensity

Sudden jumps in nanoindentation load-displacement curves of bulk metallic glasses (BMGs) signify the onset of plastic deformation. These events are investigated on varying compositions of Zr- and Hf-rich BMGs. Load-versus-displacement graphs for spherical indentations are analyzed to determine displacement, load, intensity of deformation, energy per volume, energy loss, and pressure corresponding to these key locations. Attention is focused on pressure, energy loss, and energy per volume at initial plasticity in response to varying strain rates, indenter tip radii, preload, and material composition. Energy loss was found to correlate with preload. The Zr-rich metallic glass was found to plastically deform in response to smaller loads than Hf-rich specimens.

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