Impacting behavior of bulk metallic glass powder at an abnormally high strain rate during kinetic spraying

2007 ◽  
Vol 449-451 ◽  
pp. 911-915 ◽  
Author(s):  
Sanghoon Yoon ◽  
Changhee Lee ◽  
Hanshin Choi ◽  
Hwíjun Kim ◽  
Jungchan Bae
Keyword(s):  
Metallic Glass ◽  
High Strain Rate ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Glass Powder ◽  
High Strain ◽  
Kinetic Spraying

High-strain-rate dynamic mechanical behavior of a bulk metallic glass composite

2008 ◽  
Vol 23 (4) ◽  
pp. 998-1008 ◽  
Author(s):  
Morgana Martin ◽  
Laszlo Kecskes ◽  
Naresh N. Thadhani
Keyword(s):  
Metallic Glass ◽  
High Strain Rate ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
High Speed ◽  
High Strain ◽  
Microstructural Analysis ◽  
Surface Velocity ◽  
Fracture Characteristics ◽  
Transient Deformation

The high-strain-rate mechanical properties, deformation mechanisms, and fracture characteristics of a bulk metallic glass (BMG)-matrix composite, consisting of an amorphous Zr57Nb5Cu15.4Ni12.6Al10 (LM106) matrix with crystalline tungsten reinforcement particles, were investigated using gas gun anvil-on-rod impact experiments instrumented with velocity interferometry (VISAR) and high-speed digital photography. The time-resolved elastic-plastic wave propagation response obtained through VISAR and the transient deformation states captured with the camera provided information about dynamic strength and deformation modes of the composite. Comparison of experimental measurements with AUTODYN-simulated transient deformation profiles and free surface velocity traces allowed for validation of the pressure-hardening Drucker–Prager model, which was used to describe the deformation response of the composite. The impacted specimens recovered for post-impact microstructural analysis provided further information about the mechanisms of dynamic deformation and fracture characteristics. The overall results from experiments and modeling revealed a strain to failure of ∼45% along the length and ∼7% in area, and the fracture initiation stress was found to decrease with increasing impact velocity because of the negative strain-rate sensitivity of the BMG.

Results From a Novel Insert Design for High Strain-Rate Compression of a Bulk Metallic Glass

2006 ◽  
Author(s):  
George P. Sunny ◽  
Vikas Prakash ◽  
John P. Lewandowski
Keyword(s):  
Metallic Glass ◽  
High Strain Rate ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Failure Modes ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Strain Rate Compression ◽  
Effects Of Stress

Liquidmetal-1 (LM-1, Zr41.25Ti13.75Cu12.5Ni10Be22.5) is a bulk metallic glass that can be processed in large thicknesses (e.g. 10 mm) because of its low critical cooling rate (e.g. 1 K/s). Like other bulk metallic glasses, this material exhibits near theoretical strength and large elastic strains (~2%) under quasi-static loading conditions. In this work, the Split-Hopkinson Pressure Bar (SHPB) was employed to perform high strain-rate compression tests on annealed LM-1. An ultrahigh-speed camera was also employed to perform in-situ video of the deformation process of the experiments, and the macroscopic fracture behavior was examined after testing. In addition, a new insert design was developed to reduce the effects of stress concentrations on the specimen. SHPB testing, combined with in-situ video, was performed on as-cast LM-1 using this new experimental configuration to determine the failure modes. The results of these experiments are compared to previous results to understand better the effects of stress concentration on high strain-rate behavior of bulk metallic glass.

Ductile fracture of bulk metallic glass Zr 50 Cu 40 Al 10 under high strain-rate loading

2016 ◽  
Vol 651 ◽  
pp. 848-853 ◽  
Author(s):  
L. Lu ◽  
C. Li ◽  
W.H. Wang ◽  
M.H. Zhu ◽  
X.L. Gong ◽  
...  
Keyword(s):  
Metallic Glass ◽  
High Strain Rate ◽  
Strain Rate ◽  
Ductile Fracture ◽  
Bulk Metallic Glass ◽  
High Strain ◽  
Strain Rate Loading

scholarly journals High strain rate in situ micropillar compression of a Zr-based metallic glass

2021 ◽  
Author(s):  
Rajaprakash Ramachandramoorthy ◽  
Fan Yang ◽  
Daniele Casari ◽  
Moritz Stolpe ◽  
Manish Jain ◽  
...  
Keyword(s):  
Metallic Glass ◽  
High Strain Rate ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
High Strain ◽  
Deformation Behaviour ◽  
Rate Sensitivity ◽  
Propagation Speed ◽  
Atomic Scale ◽  
Complex Deformation

Abstract High strain rate micromechanical testing can assist researchers in elucidating complex deformation mechanisms in advanced material systems. In this work, the interactions of atomic-scale chemistry and strain rate in affecting the deformation response of a Zr-based metallic glass was studied by varying the concentration of oxygen dissolved into the local structure. Compression of micropillars over six decades of strain rate uncovered a remarkable reversal of the strain rate sensitivity from negative to positive above ~ 5 s−1 due to a delocalisation of shear transformation events within the pre-yield linear regime for both samples, while a higher oxygen content was found to generally decrease the strain rate sensitivity effect. It was also identified that the shear band propagation speed increases with the actuation speed, leading to a transition in the deformation behaviour from serrated to apparent non-serrated plastic flow at ~ 5 s−1. Graphic abstract

The Effect of In-Flight Bulk Metallic Glass Particle Temperature on Impact Behavior and Crystallization

2007 ◽  
Vol 534-536 ◽  
pp. 445-448
Author(s):  
Soo Ki Kim ◽  
Sang Hoon Yoon ◽  
Chang Hee Lee
Keyword(s):  
Metallic Glass ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Deformation Behavior ◽  
Steel Substrate ◽  
Particle Temperature ◽  
Glass Particle ◽  
Impact Behavior ◽  
The Impact ◽  
Kinetic Spraying

NiTiZrSiSn bulk metallic glass powder was produced using inert gas atomization and then was sprayed onto a SS 41 mild steel substrate using the kinetic spraying process. Considering the principle of kinetic spraying and the temperature dependent deformation behavior of the bulk metallic glass, an attempt to change the in-flight particle temperature was tried by modifying the kinetic spraying apparatus. Through this study, the effects of thermal energy of in-flight particle and crystallization degree by powder preheating temperature were evaluated. The deformation behavior of bulk metallic glass is very interesting and it is largely dependent on the temperature and the strain rate. The crystalline phase formation at impact interface was dependent on the in-flight particle temperature. In addition, variations in the impact behavior need to be considered at high strain rate and in-flight particle temperature.

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