scholarly journals Microstructure and Thermal Analysis of Metastable Intermetallic Phases in High-Entropy Alloy CoCrFeMo0.85Ni

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1073
Author(s):  
Zihui Dong ◽  
Dmitry Sergeev ◽  
Michael F. Dodge ◽  
Francesco Fanicchia ◽  
Michael Müller ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Single Phase ◽  
Intermetallic Phases ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Potential Applications ◽  
Thermal Stability Of ◽  
Liquidus Temperatures

CoCrFeMoNi high entropy alloys (HEAs) exhibit several promising characteristics for potential applications of high temperature coating. In this study, metastable intermetallic phases and their thermal stability of high-entropy alloy CoCrFeMo0.85Ni were investigated via thermal and microstructural analyses. Solidus and liquidus temperatures of CoCrFeMo0.85Ni were determined by differential thermal analysis as 1323 °C and 1331 °C, respectively. Phase transitions also occur at 800 °C and 1212 °C during heating. Microstructure of alloy exhibits a single-phase face-centred cubic (FCC) matrix embedded with the mixture of (Co, Cr, Fe)-rich tetragonal phase and Mo-rich rhombohedron-like phase. The morphologies of two intermetallics show matrix-based tetragonal phases bordered by Mo-rich rhombohedral precipitates around their perimeter. The experimental results presented in our paper provide key information on the microstructure and thermal stability of our alloy, which will assist in the development of similar thermal spray HEA coatings.

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.

Alloying behavior and thermal stability of mechanically alloyed nano AlCoCrFeNiTi high-entropy alloy—CORRIGENDUM

2019 ◽  
Vol 35 (2) ◽  
pp. 215-215
Author(s):  
Vikas Shivam ◽  
Yagnesh Shadangi ◽  
Joysurya Basu ◽  
Nilay Krishna Mukhopadhyay
Keyword(s):  
Thermal Stability ◽  
High Entropy Alloy ◽  
Mechanically Alloyed ◽  
High Entropy ◽  
Thermal Stability Of

scholarly journals Thermal Stability of High Entropy Alloys during in Situ TEM Heating.

2018 ◽  
Vol 24 (S1) ◽  
pp. 1928-1929 ◽  
Author(s):  
Elaf A. Anber ◽  
Andrew C Lang ◽  
Eric A. Lass ◽  
Pranav Kumar Suri ◽  
Daniel Scotto D'Antuono ◽  
...  
Keyword(s):  
Thermal Stability ◽  
In Situ Tem ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Thermal Stability Of

scholarly journals Prediction of Strength and Ductility in Partially Recrystallized CoCrFeNiTi0.2 High-Entropy Alloy

Entropy ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 389 ◽  
Author(s):  
Hanwen Zhang ◽  
Peizhi Liu ◽  
Jinxiong Hou ◽  
Junwei Qiao ◽  
Yucheng Wu
Keyword(s):  
Tensile Strength ◽  
Single Phase ◽  
Volume Fraction ◽  
Tensile Elongation ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Number Density ◽  
High Entropy ◽  
Average Size ◽  
Strength And Ductility

The mechanical behavior of a partially recrystallized fcc-CoCrFeNiTi0.2 high entropy alloys (HEA) is investigated. Temporal evolutions of the morphology, size, and volume fraction of the nanoscaled L12-(Ni,Co)3Ti precipitates at 800 °C with various aging time were quantitatively evaluated. The ultimate tensile strength can be greatly improved to ~1200 MPa, accompanied with a tensile elongation of ~20% after precipitation. The temporal exponents for the average size and number density of precipitates reasonably conform the predictions by the PV model. A composite model was proposed to describe the plastic strain of the current HEA. As a consequence, the tensile strength and tensile elongation are well predicted, which is in accord with the experimental results. The present experiment provides a theoretical reference for the strengthening of partially recrystallized single-phase HEAs in the future.

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