scholarly journals High velocity impact of an Fe/Cr/Mn/Ni high entropy alloy

2019 ◽  
Author(s):  
M. Cameron Hawkins ◽  
Sarah Thomas ◽  
Robert Hixson ◽  
Nan Li ◽  
Saryu Fensin
Keyword(s):  
Dynamic Properties ◽  
Dynamic Compression ◽  
Surface Velocity ◽  
High Entropy Alloy ◽  
Transition Metal Alloy ◽  
High Entropy ◽  
New Class ◽  
Gas Gun ◽  
Data Points ◽  
Impact Experiments

Abstract A series of shock loading experiments were conducted on High Entropy Alloy (HEA) samples consisting of Fe/Cr/Mn/Ni in weight percentages of 25.2/23.5/24.8/26.5. Characterizing this transition metal alloy is a first step in understanding the shock compression response of this relatively new class of alloy. A single stage light gas gun was used to conduct a series of flyer plate symmetric impact experiments to obtain fundamental dynamic properties. Photonic Doppler Velocimetry (PDV) diagnostics were employed to measure the free surface velocity on the back of each target during dynamic compression. These experiments yielded four data points that are in reasonable agreement with an estimated Hugoniot for the material.

Mechanical properties and microstructure of the Al0.3CoCrFeNiTi0.3 high entropy alloy under dynamic compression

2021 ◽  
Vol 812 ◽  
pp. 141147
Author(s):  
Xianzhe Zhong ◽  
Qingming Zhang ◽  
Jing Xie ◽  
Mingze Wu ◽  
Fuqing Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dynamic Compression ◽  
High Entropy Alloy ◽  
High Entropy

Microstructure and Mechanical Properties of W-High Entropy Alloy Composite by Hot Swaging

2021 ◽  
Vol 871 ◽  
pp. 3-8
Author(s):  
Rui Zhi Jian ◽  
Shang Cheng Zhou ◽  
Yun Fei Xue
Keyword(s):  
Mechanical Properties ◽  
Dynamic Compression ◽  
Axial Direction ◽  
High Entropy Alloy ◽  
Degree Of Deformation ◽  
High Entropy ◽  
The Matrix ◽  
Compression Yield Strength ◽  
Reduction In Area ◽  
Strengthening Method

To improve the mechanical properties of a sintered WHA using high entropy alloy as the matrix (W-HEA), investigations were carried out to apply deformation strengthening method of hot swaging on the W-HEA. The W-HEA samples were swaged around 1300°C with the 10%, 15% and 20% of reduction in area. The results show that the strength and hardness of the W-HEA composite increased with the increasing degree of deformation. And the aspect ratio of tungsten grains increases along the axial direction in the swaged alloys. The hardness of W-HEA with a 20% reduction in area reaches 448 HV, and the dynamic compression yield strength is about 1911 MPa. After hot swaging, the hardness and strength of the W-HEA are greatly improved compared with the sintered W-HEA.

A promising new class of irradiation tolerant materials: Ti2ZrHfV0.5Mo0.2 high-entropy alloy

2019 ◽  
Vol 35 (3) ◽  
pp. 369-373 ◽  
Author(s):  
Yiping Lu ◽  
Hefei Huang ◽  
Xuzhou Gao ◽  
Cuilan Ren ◽  
Jie Gao ◽  
...  
Keyword(s):  
High Entropy Alloy ◽  
High Entropy ◽  
New Class

scholarly journals Structural and Thermodynamic Properties of the High-Entropy Alloy AlCoCrFeNi Based on First-Principles Calculations

2020 ◽  
Vol 7 ◽  
Author(s):  
Juefei Wu ◽  
Zhen Yang ◽  
Jiawei Xian ◽  
Xingyu Gao ◽  
Deye Lin ◽  
...  
Keyword(s):  
Thermodynamic Properties ◽  
First Principles ◽  
High Pressures ◽  
Dynamic Properties ◽  
Field Potential ◽  
The Body ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Local Lattice Distortion ◽  
High Entropy

During the past two decades, the high-entropy alloy AlCoCrFeNi has attracted much attention due to its outstanding thermal and mechanical properties under ambient conditions. However, the exploration on the thermodynamic properties of this alloy under high temperatures and high pressures is relatively insufficient. Combining structural modeling with the similar atomic environment (SAE) method and first-principles simulations with the modified mean-field potential (MMFP) approach, we studied the lattice and magnetic structure as well as the thermodynamic properties of the body-centered-cubic AlCoCrFeNi, through supercell simulations. AlCoCrFeNi was found to display a strong local lattice distortion compared with typical 3d high-entropy alloys; the ferromagnetic structure stable at 0 K was predicted to transform to the paramagnetic structure at the Curie temperature TC = 279.75 K, in good agreement with previous calculations; the calculated equilibrium volumes, bulk modulus, and shock Hugoniot all agree well with available experimental data and other theoretical values. These results demonstrate the validity and reliability of our methods used to study the dynamic properties of AlCoCrFeNi, providing a promising scheme for accessing the dynamic properties of sophisticated high-entropy alloys.

A new class of light-weight metastable high entropy alloy with high strength and large ductility

Materialia ◽  
2021 ◽  
pp. 101284
Author(s):  
Kook Noh Yoon ◽  
Hyun Seok Oh ◽  
Ji Young Kim ◽  
Min Seok Kim ◽  
Jing Zhang ◽  
...  
Keyword(s):  
High Strength ◽  
High Entropy Alloy ◽  
Light Weight ◽  
High Entropy ◽  
New Class

scholarly journals Influence of fine-scale B2 precipitation on dynamic compression and wear properties in hypo-eutectic Al0.5CoCrFeNi high-entropy alloy

2021 ◽  
Vol 853 ◽  
pp. 157126
Author(s):  
B. Gwalani ◽  
T. Torgerson ◽  
S. Dasari ◽  
A. Jagetia ◽  
M.S.K.K.Y. Nartu ◽  
...  
Keyword(s):  
Dynamic Compression ◽  
High Entropy Alloy ◽  
Fine Scale ◽  
Wear Properties ◽  
High Entropy

Investigation of Thermo-Mechanical Processing and Mechanical Properties of CoCrFeNiMn High Entropy Alloy for Peripheral Vascular Stent Application

2016 ◽  
Author(s):  
Karthik Alagarsamy ◽  
Aleksandra Fortier ◽  
Rajiv Mishra ◽  
Nilesh Kumar
Keyword(s):  
Temperature Stability ◽  
Fatigue Properties ◽  
High Entropy Alloy ◽  
Mechanical Processing ◽  
Peripheral Vascular ◽  
High Temperature Stability ◽  
Vascular Stent ◽  
High Entropy ◽  
New Class ◽  
Increased Strength

High entropy alloys (HEAs) are a new class of metallic materials with five or more principal alloying elements. Due to this distinct concept of alloying, the HEAs exhibit unique properties compared to conventional alloys. The outstanding properties of HEAs include increased strength, superior wear resistance, high temperature stability, increased fatigue properties, good corrosion and oxidation resistance. Such characteristics of HEAs have generated significant interest among the scientific community however, their application is yet to be explored. This paper discusses the mechanical and microstructural behavior of CoCrFeNiMn HEA subjected to thermo-mechanical processing, and its potential application in peripheral vascular stent implants that are prone to high failure rate. Results show that CoCrFeNiMn has characteristics that can potentially find use in peripheral vascular stent implants and extend their life-cycle.

scholarly journals Dynamic properties of additively manufactured tantalum

2021 ◽  
Vol 250 ◽  
pp. 05011
Author(s):  
Matthew Cotton ◽  
Beth Girling
Keyword(s):  
Dynamic Properties ◽  
Failure Process ◽  
Tensile Failure ◽  
Material Microstructure ◽  
Gas Gun ◽  
Post Shock ◽  
Impact Experiments ◽  
Insight Into ◽  
Supply Information

In this study a series of gas gun plate impact experiments have been conducted on samples of wire arc AM tantalum to investigate the high strain rate behaviour of the material, including tensile failure (spall) mechanisms. Conventionally processed tantalum was fielded alongside the AM material to provide a direct comparison under identical loading conditions. In-situ velocimetry data was supported by pre-shock characterisation of the samples to supply information on the initial material microstructure, and to link these features to the observed differences in dynamic behaviour. Additional post-shock analysis of the damaged region in the samples provided further insight into the failure process.

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