Effects of electro-negativity on the stability of topologically close-packed phase in high entropy alloys

2014 ◽  
Vol 52 ◽  
pp. 105-109 ◽  
Author(s):  
Yong Dong ◽  
Yiping Lu ◽  
Li Jiang ◽  
Tongmin Wang ◽  
Tingju Li
Keyword(s):  
High Entropy Alloys ◽  
High Entropy ◽  
Topologically Close Packed ◽  
The Stability ◽  
Electro Negativity

A review on phase prediction in high entropy alloys

2021 ◽  
pp. 095440622110089
Author(s):  
Vinay Kumar Soni ◽  
S Sanyal ◽  
K Raja Rao ◽  
Sudip K Sinha
Keyword(s):  
Solid Solution ◽  
Phase Formation ◽  
Single Phase ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Modeling Tools ◽  
High Entropy ◽  
Recent Developments ◽  
Phase Prediction ◽  
The Stability

The formation of single phase solid solution in High Entropy Alloys (HEAs) is essential for the properties of the alloys therefore, numerous approach were proposed by many researchers to predict the stability of single phase solid solution in High Entropy Alloy. The present review examines some of the recent developments while using computational intelligence techniques such as parametric approach, CALPHAD, Machine Learning etc. for prediction of various phase formation in multicomponent high entropy alloys. A detail study of this data-driven approaches pertaining to the understanding of structural and phase formation behaviour of a new class of compositionally complex alloys is done in the present investigation. The advantages and drawbacks of the various computational are also discussed. Finally, this review aims at understanding several computational modeling tools complying the thermodynamic criteria for phase formation of novel HEAs which could possibly deliver superior mechanical properties keeping an aim at advanced engineering applications.

Topologically Close-packed Phase Formation in High Entropy Alloys: A Review of Calphad and Experimental Results

JOM ◽  
2017 ◽  
Vol 69 (11) ◽  
pp. 2113-2124 ◽  
Author(s):  
K. Guruvidyathri ◽  
K. C. Hari Kumar ◽  
J. W. Yeh ◽  
B. S. Murty
Keyword(s):  
Phase Formation ◽  
Experimental Results ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Topologically Close Packed

Effect of FCC anti-ferromagnetic ordering on the stability of phases in Fe60-xMn30Cr10Cox high entropy alloys

2020 ◽  
Vol 823 ◽  
pp. 153845 ◽  
Author(s):  
M.D. Acciarri ◽  
P. La Roca ◽  
L.M. Guerrero ◽  
A. Baruj ◽  
J. Curiale ◽  
...  
Keyword(s):  
High Entropy Alloys ◽  
High Entropy ◽  
The Stability ◽  
Ferromagnetic Ordering

scholarly journals High-Pressure Induced Phase Transitions in High-Entropy Alloys: A Review

Entropy ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 239 ◽  
Author(s):  
Fei Zhang ◽  
Hongbo Lou ◽  
Benyuan Cheng ◽  
Zhidan Zeng ◽  
Qiaoshi Zeng
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Future Research ◽  
High Entropy Alloys ◽  
High Entropy ◽  
New Class ◽  
Materials Research ◽  
The Stability ◽  
Irreversible Phase Transitions

High-entropy alloys (HEAs) as a new class of alloy have been at the cutting edge of advanced metallic materials research in the last decade. With unique chemical and topological structures at the atomic level, HEAs own a combination of extraordinary properties and show potential in widespread applications. However, their phase stability/transition, which is of great scientific and technical importance for materials, has been mainly explored by varying temperature. Recently, pressure as another fundamental and powerful parameter has been introduced to the experimental study of HEAs. Many interesting reversible/irreversible phase transitions that were not expected or otherwise invisible before have been observed by applying high pressure. These recent findings bring new insight into the stability of HEAs, deepens our understanding of HEAs, and open up new avenues towards developing new HEAs. In this paper, we review recent results in various HEAs obtained using in situ static high-pressure synchrotron radiation x-ray techniques and provide some perspectives for future research.

scholarly journals Microstructural Stability of the CoCrFe2Ni2 High Entropy Alloys with Additions of Cu and Mo

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1994
Author(s):  
Isaac Toda-Caraballo ◽  
Jose Antonio Jiménez ◽  
Srdjan Milenkovic ◽  
Jorge Jimenez-Aguirre ◽  
David San-Martín
Keyword(s):  
Enthalpy Of Mixing ◽  
High Entropy Alloys ◽  
Surprising Result ◽  
Microstructural Stability ◽  
Rich Phase ◽  
High Entropy ◽  
Single Face ◽  
Precipitation Phenomena ◽  
The Stability ◽  
Fcc Structure

New High Entropy Alloys based on the CoCrFe2Ni2 system have been developed by adding up to 10 at. % of Cu, Mo, and Cu + Mo in different amounts. These alloys showed a single face-centred cubic (FCC) structure after homogenization at 1200 °C. In order to evaluate their thermal stability, aging heat treatments at 500, 700, and 900 °C for 8 h were applied to study the possible precipitation phenomena. In the alloys where only Cu or Mo was added, we found the precipitation of an FCC Cu-rich phase or the µ phase rich in Mo, respectively, in agreement with some of the results previously shown in the literature. Nevertheless, we have observed that when both elements are present, Cu precipitation does not occur, and the formation of the Mo-rich phase is inhibited (or delayed). This is a surprising result as Cu and Mo have a positive enthalpy of mixing, being immiscible in a binary system, while added together they improve the stability of this system and maintain a single FCC crystal structure from medium to high temperatures

Effect of Al Content on Microstructure and Properties of AlxMoNbTiV RCCA’s Alloys

2018 ◽  
Vol 941 ◽  
pp. 1111-1116 ◽  
Author(s):  
Antoine Lacour-Gogny-Goubert ◽  
Zhao Zhao-Huvelin ◽  
Agnès Bachelier-Locq ◽  
Ivan Guillot ◽  
Anne Denquin
Keyword(s):  
Room Temperature ◽  
High Entropy Alloys ◽  
Compression Tests ◽  
Micro Hardness ◽  
High Entropy ◽  
Al Content ◽  
Arc Melting ◽  
Bcc Structure ◽  
The Stability ◽  
Cast Microstructure

The objective of this study is the evaluation of high entropy alloys for aeroengines applications up to 1000°C. AlxNbMoTiV alloys with 10 and 20 at.% Al have been produced by arc melting. As-cast microstructure and phase transformations during heat treatments have been investigated through SEM, DRX and TEM, revealing the possibility of homogenization at 1400°C and the stability of the BCC structure at 1000°C and 800°C for both alloys. Mechanical properties have been evaluated through micro-hardness and compression tests up to 800°C. It appears that, although both alloys show a similar microstructure and hardness evolution with heat treatment, the Alloy containing 10 at.% of Al show a higher yield strength at room temperature and 800°C, related to the brittle character of the alloy containing 20 at.% of Al.

scholarly journals Unconventional Deformation Behaviours of Nanoscaled High-Entropy Alloys

Entropy ◽  
2018 ◽  
Vol 20 (10) ◽  
pp. 778 ◽  
Author(s):  
Yeqiang Bu ◽  
Shenyou Peng ◽  
Shiwei Wu ◽  
Yujie Wei ◽  
Gang Wang ◽  
...  
Keyword(s):  
Phase Transformations ◽  
First Principles ◽  
Atomic Scale ◽  
High Entropy Alloys ◽  
First Principles Calculations ◽  
High Entropy ◽  
Fcc Metals ◽  
The Stability ◽  
Similar Deformation

The bulk high-entropy alloys (HEAs) exhibit similar deformation behaviours as traditional metals. These bulk behaviours are likely an averaging of the behaviours exhibited at the nanoscale. Herein, in situ atomic-scale observation of deformation behaviours in nanoscaled CoCrCuFeNi face-centred cubic (FCC) HEA was performed. The deformation behaviours of this nanoscaled FCC HEA (i.e., nanodisturbances and phase transformations) were distinct from those of nanoscaled traditional FCC metals and corresponding bulk HEA. First-principles calculations revealed an obvious fluctuation of the stacking fault energy and stability difference at the atomic scale in the HEA. The stability difference was highlighted only in the nanoscaled HEA and induced unconventional deformation behaviours. Our work suggests that the nanoscaled HEA may provide more chances to discover the long-expected essential distinction between the HEAs and traditional metals.

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