High-strength ultrafine-grained CoCrFeNiNb high-entropy alloy prepared by mechanical alloying: Properties and strengthening mechanism

2020 ◽  
Vol 835 ◽  
pp. 155308 ◽  
Author(s):  
Filip Průša ◽  
Marcello Cabibbo ◽  
Alexandra Šenková ◽  
Vojtěch Kučera ◽  
Zbyněk Veselka ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
High Strength ◽  
Strengthening Mechanism ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Ultrafine Grained

Diffraction, microstructure and thermal stability analysis in a double phase nanocrystalline Al20Mg20Ni20Cr20Ti20 high entropy alloy

2017 ◽  
Vol 26 (3-4) ◽  
pp. 127-132 ◽  
Author(s):  
A.M. Rameshbabu ◽  
P. Parameswaran ◽  
V. Vijayan ◽  
R. Panneer
Keyword(s):  
High Temperature ◽  
Mechanical Alloying ◽  
High Strength ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Plasma Sintering ◽  
Double Phase ◽  
Trial And Error Method ◽  
Superior Corrosion Resistance ◽  
Fcc Phase

AbstractAn effort has been made to develop a new composition of AlMgNiCrTi high entropy alloy (HEA) with a distinct properties includes squat density, intense strength and hardness, superior corrosion resistance, better oxidation resistance, high temperature resistance, fatigue load and crack resistance to congregate the necessity of aircraft applications. The equivalent atomic percentage for the above defined composition is established using analytical correlation for molar and atom renovation by trial and error method. The alloy is synthesized by powder metallurgy technique through mechanical alloying. Succeeding to mechanical alloying it is elucidated that the metal powder is primarily composed of single BCC solid solution with crystallite magnitude <10 nm. It is also observed that the alloy is thermally stable at prominent temperature about 800°C as it is retained its nanostructure which was revealed using differential scanning caloriemetry (DSC). This alloy powder was consolidated and sintered using spark plasma sintering at 800°C with 50 Mpa pressure to a density of 98.83%. Subsequent to sintering, Titanium carbide FCC phase evolved along with the BCC phase. The alloying behavior and phase transformation were studied using X-ray diffraction (XRD) and scanning electron microscope (SEM). The homogeneity of the composition is confirmed by energy dispersive spectroscopy (EDS). The hardness of the alloy is found to be 710±20 HV. The evolutions of the phases and hardness imply that this alloy is apposite for both high strength and high temperature applications.

Strengthening mechanism in a high-strength carbon-containing powder metallurgical high entropy alloy

2018 ◽  
Vol 102 ◽  
pp. 58-64 ◽  
Author(s):  
Jiawen Wang ◽  
Bin Liu ◽  
C.T. Liu ◽  
Yong Liu
Keyword(s):  
High Strength ◽  
Strengthening Mechanism ◽  
High Entropy Alloy ◽  
High Entropy

Fabrication of MgAlSiCrFe Low-Density High-Entropy Alloy by Mechanical Alloying and Spark Plasma Sintering

2021 ◽  
Author(s):  
Nandini Singh ◽  
Yagnesh Shadangi ◽  
G. Suryaprakash Goud ◽  
Vivek Kumar Pandey ◽  
Vikas Shivam ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
High Entropy Alloy ◽  
Low Density ◽  
High Entropy ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Influence of V and Heat Treatment on Characteristics of WMoNbTaV Refractory High-Entropy Alloy Coatings by Mechanical Alloying

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 265
Author(s):  
Chun-Liang Chen ◽  
Sutrisna
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Annealing Treatment ◽  
High Energy ◽  
304 Stainless Steel ◽  
Homogeneous Distribution ◽  
High Entropy Alloy ◽  
Solid Solution Phase ◽  
High Entropy ◽  
Steel Substrates

Refractory high-entropy alloy (RHEA) is one of the most promising materials for use in high-temperature structural materials. In this study, the WMoNbTaV coatings on 304 stainless steel substrates has been prepared by mechanical alloying (MA). Effects of V addition and subsequent heat treatment on properties of the WMoNbTaV coatings were investigated. The results show that the RHEA coatings with nanocrystalline body-centered cubic (BCC) solid-solution phase were generated by the mechanical alloying process. The presence of the V element promotes a uniform microstructure and homogeneous distribution of composition in the RHEA coatings due to improving alloying efficiency, resulting in an increase of hardness. After the annealing treatment of the RHEA coatings, microstructure homogeneity was further enhanced; however, the high affinity of Ta for oxygen causes the formation of Ta-rich oxides. Annealing also removes strain hardening generated by high-energy ball milling and thus decreases the hardness of the RHEA coating and alters microstructure evolution and mechanical properties.

Strengthening mechanism in two-phase FeCoCrNiMnAl high entropy alloy coating

2020 ◽  
Vol 530 ◽  
pp. 147205 ◽  
Author(s):  
Yan Cui ◽  
Junqi Shen ◽  
Sunusi Marwana Manladan ◽  
Keping Geng ◽  
Shengsun Hu
Keyword(s):  
Alloy Coating ◽  
Strengthening Mechanism ◽  
High Entropy Alloy ◽  
Two Phase ◽  
High Entropy

WReTaMo Refractory High‐Entropy Alloy with High Strength at 1600 °C

2021 ◽  
pp. 2100765
Author(s):  
Yixing Wan ◽  
Qianqian Wang ◽  
Jinyong Mo ◽  
Zhibin Zhang ◽  
Xin Wang ◽  
...  
Keyword(s):  
High Strength ◽  
High Entropy Alloy ◽  
High Entropy
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