Small-Scale Plastic Deformation of Nanocrystalline High Entropy Alloy

High entropy alloys (HEAs) have attracted widespread interest due to their unique properties at many different length-scales. Here, we report the fabrication of nanocrystalline (NC) Al0.1CoCrFeNi high entropy alloy and subsequent small-scale plastic deformation behavior via nano-pillar compression tests. Exceptional strength was realized for the NC HEA compared to pure Ni of similar grain sizes. Grain boundary mediated deformation mechanisms led to high strain rate sensitivity of flow stress in the nanocrystalline HEA.

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Plastic Deformation Behavior of 40Fe–25Ni–15Cr–10Co–10V High-Entropy Alloy for Cryogenic Applications

Metals and Materials International ◽

10.1007/s12540-018-0184-6 ◽

2018 ◽

Vol 25 (2) ◽

pp. 277-284 ◽

Cited By ~ 22

Author(s):

Min Ji Jang ◽

Hyunjeong Kwak ◽

Ye Won Lee ◽

Youjin Jeong ◽

Jahong Choi ◽

...

Keyword(s):

Plastic Deformation ◽

Deformation Behavior ◽

High Entropy Alloy ◽

High Entropy ◽

Plastic Deformation Behavior

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Effect of Precipitates on Plastic Deformation Behavior of High Entropy Alloy Al0.3CoCrFeNi Under High Strain Rate Loading

Journal of Engineering Materials and Technology ◽

10.1115/1.4048607 ◽

2020 ◽

Vol 143 (2) ◽

Author(s):

Prasanta K. Das ◽

Vishal Kumar ◽

Prasenjit Khanikar

Keyword(s):

Plastic Deformation ◽

High Strain Rate ◽

Strain Rate ◽

High Strain ◽

Microstructural Analysis ◽

Dynamics Simulation ◽

High Entropy Alloy ◽

High Entropy ◽

Plastic Deformation Behavior ◽

Strain Rate Loading

Abstract High entropy alloys (HEAs) are primarily known for their high strength and high thermal stability. These alloys have recently been studied for high strain rate applications as well. HEAs have been observed to exhibit different properties when subjected to different strain rates. Very few published results on HEAs are available for high strain rate loading conditions. In addition, modeling and simulation work of microstructural details, such as grain boundary and precipitates of HEAs have not yet been investigated. However, at an atomistic length scale, molecular dynamics simulation works of HEAs have already been published. In this study, a detailed microstructural analysis of plastic deformation of the material under high strain rate loading has been performed using dislocation density based crystal plasticity finite element modeling. The primary objective is, therefore, to assess the strengthening effects due to precipitates on a particular high entropy alloy Al0.3CoCrFeNi with ultrafine grains having randomly distributed NiAl precipitates.

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Plastic deformation behavior of ultrafine grained CoCrFeNiMn high entropy alloy with nanoparticles

Intermetallics ◽

10.1016/j.intermet.2021.107459 ◽

2022 ◽

Vol 142 ◽

pp. 107459

Author(s):

Yuehuang Xie ◽

Zhen Zhang ◽

Yifei Luo ◽

Jun Wang ◽

Jiamiao Liang ◽

...

Keyword(s):

Plastic Deformation ◽

Deformation Behavior ◽

High Entropy Alloy ◽

High Entropy ◽

Ultrafine Grained ◽

Plastic Deformation Behavior

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Micro-Scale Mechanical Behavior of Ultrafine-Grained Materials Processed by High-Pressure Torsion

Materials Science Forum ◽

10.4028/www.scientific.net/msf.941.1495 ◽

2018 ◽

Vol 941 ◽

pp. 1495-1500

Author(s):

Megumi Kawasaki ◽

Jae Kyung Han ◽

Dong Hyung Lee ◽

Jae Il Jang ◽

Terence G. Langdon

Keyword(s):

High Pressure ◽

Mechanical Behavior ◽

Mechanical Response ◽

High Pressure Torsion ◽

Annealing Treatment ◽

Rate Sensitivity ◽

Small Scale ◽

High Entropy Alloy ◽

High Entropy ◽

Ultrafine Grained

Bulk ultrafine-grained (UFG) materials usually show superior mechanical and physical properties. The development of micro-mechanical behavior is observed after significant changes in microstructure through high-pressure torsion (HPT) processing. This report summarizes recent results on the evolution of small-scale mechanical response examined by the nanoindentation technique on two UFG materials including a high-entropy alloy and an Al-Mg metal matrix nanocomposite processed by HPT. Special emphasis is placed on demonstrating the interrelationship of essential microstructural changes with increasing torsional strain and applying a post-deformation annealing treatment and the evolution of the micro-mechanical behavior in these UFG materials by estimating the strain rate sensitivity.

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Unusual plastic deformation behavior of nanotwinned Cu/high entropy alloy FeCoCrNi nanolaminates

Nanoscale ◽

10.1039/c9nr00836e ◽

2019 ◽

Vol 11 (23) ◽

pp. 11340-11350 ◽

Cited By ~ 4

Author(s):

Y. F. Zhao ◽

J. Y. Zhang ◽

Y. Q. Wang ◽

K. Wu ◽

G. Liu ◽

...

Keyword(s):

Plastic Deformation ◽

Deformation Behavior ◽

Dominant Role ◽

High Entropy Alloy ◽

High Entropy Alloys ◽

Popular Belief ◽

Soft Phase ◽

High Entropy ◽

Plastic Deformation Behavior

Contrary to the popular belief that the soft phase in bimetal multilayers plays the dominant role in plastic deformation, the hard FeCoCrNi high entropy alloys (HEA) phase makes more contribution to the deformation of Cu/HEA nanolaminates.

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Micro-Mechanical Responses of Ultrafine-Grained Materials Processed through High-Pressure Torsion

Materials Science Forum ◽

10.4028/www.scientific.net/msf.879.42 ◽

2016 ◽

Vol 879 ◽

pp. 42-47 ◽

Cited By ~ 1

Author(s):

Megumi Kawasaki ◽

Jae Il Jang ◽

Byung Min Ahn ◽

Terence G. Langdon

Keyword(s):

High Pressure ◽

High Pressure Torsion ◽

Rate Sensitivity ◽

Small Scale ◽

High Entropy Alloy ◽

High Entropy ◽

Mechanical Responses ◽

Ultrafine Grained ◽

Mechanical And Physical Properties ◽

Zk60 Magnesium Alloy

The processing of metals through the application of high-pressure torsion (HPT) provides the potential for achieving exceptional grain refinement in bulk metal solids. These ultrafine grains in the bulk metals usually show superior mechanical and physical properties. Especially, the development of micro-mechanical behavior is observed after significant changes in microstructure through processing and it is of great importance for obtaining practical future applications of these ultrafine-grained metals. Accordingly, this presentation demonstrates the evolution of small-scale deformation behavior through nanoindentation experiments after HPT on various metallic alloys including a ZK60 magnesium alloy, a Zn-22% Al eutectoid alloy and a high entropy alloy. Special emphasis is placed on demonstrating the essential microstructural changes of these materials with increased straining by HPT and the evolution of the micro-mechanical responses in these materials by measuring the strain rate sensitivity.

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