Effects of annealing treatment on phase composition and microstructure of CoCrFeNiTiAlx high-entropy alloys

2012 ◽  
Vol 22 ◽  
pp. 24-32 ◽  
Author(s):  
Kuibao Zhang ◽  
Zhengyi Fu
Keyword(s):  
Phase Composition ◽  
Annealing Treatment ◽  
High Entropy Alloys ◽  
High Entropy

Effects of phase composition and elemental partitioning on soft magnetic properties of AlFeCoCrMn high entropy alloys

2019 ◽  
Vol 171 ◽  
pp. 31-39 ◽  
Author(s):  
Chanwon Jung ◽  
Ku Kang ◽  
Amalraj Marshal ◽  
Konda Gokuldoss Pradeep ◽  
Jae-Bok Seol ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
High Entropy Alloys ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
High Entropy

Effect of the Annealing Treatment on the Microstructure, Microhardness and Corrosion Behaviour of Al0.3CrFe1.5MnNi0.5 High-Entropy Alloys

2013 ◽  
Vol 748 ◽  
pp. 79-85 ◽  
Author(s):  
L.C. Tsao ◽  
C.S. Chen ◽  
Kuo Huan Fan ◽  
Yen Teng Huang
Keyword(s):  
Corrosion Behaviour ◽  
Dendritic Structure ◽  
Annealing Treatment ◽  
Age Hardening ◽  
High Entropy Alloy ◽  
Second Phase ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Fcc Phase ◽  
Bcc Phase

In this study, an Al0.3CrFe1.5MnNi0.5high entropy alloy was synthesized by arc-melting in Ar. The as-cast alloy ingot was heat treated for 8 h at 650-750°C and then cooled in furnace to investigate the effects of age treatment on the microstructure, hardness and corrosion behaviour. The microstructure of as-cast sample has a typical rich-Cr BCC structure of dendrites, rich-Ni FCC interdendrite phases and a small fraction of cross-like rich-Ni FCC phase within the majority dendritic structure. During annealing treatment at 650°C, the cross-like FCC phase (β-FCC) gradually decreased, dendritic rich-Cr BCC phase transfers to Cr5Fe6Mn8phase, and the AlNi phase precipitated within the matrix dendrites. The interdendritic β1-FCC phases gradually decomposed and transfers to second-phase (β2FCC), and the AlNi precipitated phase coarsen during annealing at 750°C. In addition, Cr5Fe6Mn8phase gradually transfers to rich-Cr BCC phase during slow-cooling process. These precipitation phases in the grain matrix are the main age hardening mechanism. The potentiodynamic polarization of the Al0.3CrFe1.5MnNi0.5high entropy alloys, obtained in 3.5% NaCl solutions, clearly revealed that the corrosion resistance increases and the passive region decreases as annealing temperature increasing.

Effect of Annealing Treatment on the Microstructure and Magnetic Properties of FeSiBAlNi(C, Ce) High Entropy Alloys

2016 ◽  
Vol 849 ◽  
pp. 52-57 ◽  
Author(s):  
Jing Xu ◽  
Zheng Feng Zhao ◽  
Yan Wang
Keyword(s):  
Magnetic Properties ◽  
Amorphous Phase ◽  
Annealing Treatment ◽  
Particle Morphology ◽  
High Entropy Alloys ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
High Entropy ◽  
Temperature Range ◽  
Microstructure And Magnetic Properties

In this paper, the effects of annealing treatment on the microstructure, thermal property and magnetic properties of mechanical alloyed FeSiBAlNiC and FeSiBAlNiCe amorphous high entropy alloys has been systematically investigated using X-ray diffraction, differential scanning calorimetry, field emission scanning electron microscopy and alternation gradient magnetometry. The results showed that annealing at different temperature range induced the pronounced microstructural evolution from the amorphous phase to a mixture of amorphous phase and intermetallics but without any formation of solid solutions. In addition, the thermal stability and heat resistance were enhanced with increasing the annealing temperature. Similarly, annealing treatment also had significant effect on the particle morphology, making the particles evolve from near-round shape to plate-like shape. Furthermore, subsequent annealing of W6-Ce amorphous HEAs enhanced the saturation magnetization (Ms) remarkably (from 0.6 emu/g of 140 h as-milled W6-Ce to 20.17 emu/g). But for the Ms values of the 140 h as-milled amorphous W6-C HEAs, annealing in different temperature range all exhibited a slightly decreased effect.

scholarly journals Phase Composition and Hardness of Series of Nanocrystalline CoCrFeMnMoNiTiW High-Entropy Alloys

2019 ◽  
Vol 25 (S2) ◽  
pp. 2416-2417
Author(s):  
CD Gómez-Esparza ◽  
R Martínez-Sánchez ◽  
A Duarte-Moller ◽  
CA Rodríguez-González
Keyword(s):  
Phase Composition ◽  
High Entropy Alloys ◽  
High Entropy

scholarly journals SPS-assisted Synthesis of SICp reinforced high entropy alloys: reactivity of SIC and effects of pre-mechanical alloying and post-annealing treatment

2017 ◽  
Vol 61 (1) ◽  
pp. 64-72 ◽  
Author(s):  
E. Colombini ◽  
M. Lassinantti Gualtieri ◽  
R. Rosa ◽  
F. Tarterini ◽  
M. Zadra ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Annealing Treatment ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Post Annealing

scholarly journals The Microstructures and Electrical Resistivity of (Al, Cr, Ti)FeCoNiOxHigh-Entropy Alloy Oxide Thin Films

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Chun-Huei Tsau ◽  
Zhang-Yan Hwang ◽  
Swe-Kai Chen
Keyword(s):  
Thin Films ◽  
Oxide Films ◽  
Annealing Treatment ◽  
Metallic Alloys ◽  
Vacuum Furnace ◽  
High Entropy Alloys ◽  
Oxide Thin Films ◽  
Metal Oxide Films ◽  
High Entropy ◽  
Feconi Alloy

The (Al, Cr, Ti)FeCoNi alloy thin films were deposited by PVD and using the equimolar targets with same compositions from the concept of high-entropy alloys. The thin films became metal oxide films after annealing at vacuum furnace for a period; and the resistivity of these thin films decreased sharply. After optimum annealing treatment, the lowest resistivity of the FeCoNiOx, CrFeCoNiOx, AlFeCoNiOx, and TiFeCoNiOxfilms was 22, 42, 18, and 35 μΩ-cm, respectively. This value is close to that of most of the metallic alloys. This phenomenon was caused by delaminating of the alloy oxide thin films because the oxidation was from the surfaces of the thin films. The low resistivity of these oxide films was contributed to the nonfully oxidized elements in the bottom layers and also vanishing of the defects during annealing.

scholarly journals Computational property predictions of Ta–Nb–Hf–Zr high-entropy alloys

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shashank Mishra ◽  
Soumyadipta Maiti ◽  
Beena Rai
Keyword(s):  
Shear Stress ◽  
Yield Strength ◽  
Configurational Entropy ◽  
Annealing Treatment ◽  
Nuclear Radiation ◽  
Solid Solution Alloy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Principal Axes ◽  
Edge Dislocations

AbstractRefractory high entropy alloys (R-HEAs) are becoming prominent in recent years because of their properties and uses as high strength and high hardness materials for ambient and high temperature, aerospace and nuclear radiation tolerance applications, orthopedic applications etc. The mechanical properties like yield strength and ductility of TaNbHfZr R-HEA depend on the local nanostructure and chemical ordering, which in term depend on the annealing treatment. In this study we have computationally obtained various properties of the equimolar TaNbHfZr alloy like the role of configurational entropy in the thermodynamic property, rate of evolution of nanostructure morphology in thermally annealed systems, dislocation simulation based quantitative prediction of yield strength, nature of dislocation movement through short range clustering (SRC) and qualitative prediction of ductile to brittle transition behavior. The simulation starts with hybrid Monte Carlo/Molecular Dynamics (MC/MD) based nanostructure evolution of an initial random solid solution alloy structure with BCC lattice structure created with principal axes along [1 1 1], [− 1 1 0] and [− 1 − 1 2] directions suitable for simulation of ½[1 1 1] edge dislocations. Thermodynamic properties are calculated from the change in enthalpy and configurational entropy, which in term is calculated by next-neighbor bond counting statistics. The MC/MD evolved structures mimic the annealing treatment at 1800 °C and the output structures are replicated in periodic directions to make larger 384,000 atom structures used for dislocation simulations. Edge dislocations were utilized to obtain and explain for the critically resolved shear stress (CRSS) for the structures with various degrees of nanostructure evolution by annealing, where extra strengthening was observed because of the formations of SRCs. Lastly the MC/MD evolved structures containing dislocations are subjected to a high shear stress beyond CRSS to investigate the stability of the dislocations and the lattice structures to explain the experimentally observed transition from ductile to brittle behavior for the TaNbHfZr R-HEA.

Effect of Annealing on Phase Composition and Microstructure of the CoCrFeNiMnVx (x=0, 0.25, 0.5, 0.75, 1) High Entropy Alloys

2015 ◽  
pp. 1157-1164
Author(s):  
N.D. Stepanov ◽  
D.G. Shaysultanov ◽  
G.A. Salishchev ◽  
M.A. Tikhonovsky ◽  
O.N. Senkov
Keyword(s):  
Phase Composition ◽  
High Entropy Alloys ◽  
High Entropy
Sign in / Sign up

Export Citation Format

Share Document