A superior combination of strength-ductility in CoCrFeNiMn high-entropy alloy induced by asymmetric rolling and subsequent annealing treatment

2018 ◽  
Vol 145 ◽  
pp. 619-626 ◽  
Author(s):  
Z.H. Han ◽  
S. Liang ◽  
J. Yang ◽  
R. Wei ◽  
C.J. Zhang
Keyword(s):  
Annealing Treatment ◽  
Subsequent Annealing ◽  
High Entropy Alloy ◽  
Asymmetric Rolling ◽  
High Entropy

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.

Influence of remelting and annealing treatment on corrosion resistance of AlFeNiCoCuCr high entropy alloy in 3.5% NaCl solution

2019 ◽  
Vol 775 ◽  
pp. 565-570 ◽  
Author(s):  
Xiaorong Zhang ◽  
Jing Guo ◽  
Xiaohui Zhang ◽  
Yuepeng Song ◽  
Zongxi Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Annealing Treatment ◽  
High Entropy Alloy ◽  
Nacl Solution ◽  
High Entropy

scholarly journals Microstructure evolution of a novel low-density Ti–Cr–Nb–V refractory high entropy alloy during cold rolling and subsequent annealing

2019 ◽  
Vol 158 ◽  
pp. 109980 ◽  
Author(s):  
N. Yu Yurchenko ◽  
E.S. Panina ◽  
S.V. Zherebtsov ◽  
M.A. Tikhonovsky ◽  
G.A. Salishchev ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Microstructure Evolution ◽  
Subsequent Annealing ◽  
High Entropy Alloy ◽  
Low Density ◽  
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.

Micro-Scale Mechanical Behavior of Ultrafine-Grained Materials Processed by High-Pressure Torsion

2018 ◽  
Vol 941 ◽  
pp. 1495-1500
Author(s):  
Megumi Kawasaki ◽  
Jae Kyung Han ◽  
Dong Hyung Lee ◽  
Jae Il Jang ◽  
Terence G. Langdon
Keyword(s):  
High Pressure ◽  
Mechanical Behavior ◽  
Mechanical Response ◽  
High Pressure Torsion ◽  
Annealing Treatment ◽  
Rate Sensitivity ◽  
Small Scale ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Ultrafine Grained

Bulk ultrafine-grained (UFG) materials usually show superior mechanical and physical properties. The development of micro-mechanical behavior is observed after significant changes in microstructure through high-pressure torsion (HPT) processing. This report summarizes recent results on the evolution of small-scale mechanical response examined by the nanoindentation technique on two UFG materials including a high-entropy alloy and an Al-Mg metal matrix nanocomposite processed by HPT. Special emphasis is placed on demonstrating the interrelationship of essential microstructural changes with increasing torsional strain and applying a post-deformation annealing treatment and the evolution of the micro-mechanical behavior in these UFG materials by estimating the strain rate sensitivity.

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