Evolution of microstructure and texture during thermo-mechanical processing of a two phase Al0.5CoCrFeMnNi high entropy alloy

Wani, I. S.; Sathiaraj, G. Dan; Ahmed, M Z; Reddy, S. R.; Bhattacharjee, P.P.

doi:10.1016/j.matchar.2016.06.021

Cited by 72 publications

(15 citation statements)

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“…In all the three processed materials, the L1 2 /FCC phase fraction decreases after annealing at 800°C but increases with increasing annealing temperature, indicating that the L1 2 /FCC phase becomes stable at higher annealing temperature. This trend is observed in cold-rolled EHEA [41] and also in dual phase HEAs, such as Al 0.5 CoCrFeMnNi [4], and could be understood from the fact that the phase fractions in duplex materials vary depending upon the annealing temperature.…”

Section: Evolution Of Annealed Microstructure and Texturementioning

confidence: 80%

Strain-path controlled microstructure, texture and hardness evolution in cryo-deformed AlCoCrFeNi 2.1 eutectic high entropy alloy

et al. 2018

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The effect of strain path on microstructure, texture and hardness properties of AlCoCrFeNi 2.1 eutectic high entropy alloy containing ordered FCC (L1 2) and ordered BCC (B2) was investigated. The EHEA was cryo-rolled using UCR, MSCR (during which the samples were rotated by 90° around the ND between each pass) and TSCR(45°) (in which the samples were deformed by unidirectional rolling to half of the total strain and then diagonally rolled for rest half of the strain). The UCR processed material showed a rather heterogeneous microstructure. The textures of the L1 2 /FCC and B2 phases in the MSCR processed material agreed with the cross-rolling texture of the corresponding single phase materials, while the texture of the two phases in the TSCR(45°) processed materials appeared rather weak. Upon annealing at 800°C, the UCR processed materials showed a novel heterogeneous microstructure, while the MSCR and TSCR(45°) processed materials revealed microduplex structure. The heterogeneous microstructure was replaced by the usual microduplex structure at higher annealing temperatures. The annealing texture of the L1 2 /FCC phase showed the presence of α-fiber (ND//<011>) components while the B2 phase showed strong ND-fiber (ND//<111>) components. The UCR processed material with novel heterogeneous microstructure showed much greater hardness as compared to the MSCR and TSCR(45°) processed materials. The present results indicate that strain path exerted significant influence in controlling microstructure, texture and hardness properties of EHEA.

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Section: Evolution Of Annealed Microstructure and Texturementioning

confidence: 80%

Strain-path controlled microstructure, texture and hardness evolution in cryo-deformed AlCoCrFeNi 2.1 eutectic high entropy alloy

et al. 2018

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“…ese alloys have unique mechanical properties which may completely differ from their constituting elements. Additionally, the properties of HEAs can be significantly improved by thermomechanical processing which makes these alloys immensely suitable for the demanding applications as reported by Wani et al [4]. According to the recent investigations on the eutectic AlCoCrFeNi 2.1 high-entropy alloy [5,6], ultimate tensile strength values exceeding 1000 MPa were obtained along with 10% ductility via rolling the cast samples up to 90% reduction followed by annealing at 1200°C.…”

Section: Introductionmentioning

confidence: 97%

Effect of Heat Treatment and Titanium Addition on the Microstructure and Mechanical Properties of Cast Fe₃₁Mn₂₈ Ni₁₅Al_24.5Ti_x High-Entropy Alloys

El‐Hadad

Ibrahim

Mourad

2019

Advances in Materials Science and Engineering

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High-entropy alloys (HEAs) are multiprincipal element alloys with controllable properties. Studying the mechanical properties of these alloys and relating them to their microstructures is of interest. In the current investigation, Fe31Mn28 Ni15Al24.5Tix high-entropy alloys with Ti content (0–3 wt.%) were prepared by casting in an induction furnace. Different heat treatments were applied, and the microstructure and hardness of the cast samples were studied. It was observed that addition of up to 3.0 wt.% Ti significantly increases the hardness of the alloy from 300 to 500 (Hv) by the combined effect of solid solution strengthening and via decreasing lamellar spacing. Heat treatment at 900°C for 10 h enhanced the hardness at lower Ti percentages (0.0–0.8 wt.%) by decreasing the lamellar spacing, while no change was observed at higher Ti content. It was also observed that extending the treatment time to 20 h affected negatively the hardness of the alloy. Concluding, HEAs can achieve high hardness using low-cost principle elements with minor alloying additives compared to the other traditional alloys.

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“…As for FSW of HEAs, several studies have been conducted. Zhu et al [12,13] first tested the FSW of Al 0.3 CoCr-FeNi and Co 16 Cr 28 Fe 28 Ni 28 HEAs at two different welding speeds. They studied the cross-sectional microstructure, mechanism of recrystallization, shear texture, and microhardness of the welds.…”

Section: Introductionmentioning

confidence: 99%

“…According to previous studies [15], Al addition has been demonstrated to give rise to the formation of the second phase at room temperature, normally of BCC/B2 structure, in single face-centered cubic (FCC) HEAs. Moreover, the presence of the BCC phase in the FCC matrix can significantly increase the difficulty in processing at room temperature [16]. However, the newly designed Al 0.3 CoCr-Cu 0.3 FeNi HEA was proved to be single FCC [17] and was treated with bead-on-plate FSW at four different rotational speeds from 200 to 500 rpm to further evaluate the weldability of the HEAs under FSW.…”

Section: Introductionmentioning

confidence: 99%

Effects of rotational speed on the Al0.3CoCrCu0.3FeNi high-entropy alloy by friction stir welding

Lin

Peng

et al. 2020

High Temperature Materials and Processes

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Welding and relevant studies are indispensable to employ high-entropy alloys for practical applications. In this study, Al0.3CoCrCu0.3FeNi high-entropy alloy with single FCC phase was used to make “bead-on-plate” friction stir welds at different rotational speeds, and the effects on microstructure and mechanical properties were studied. Several banded structures containing oxide or nitride particles were observed in the stir zone (SZ), and the chemical wear of the polycrystalline cubic boron nitride tool was confirmed. The microhardness distribution of the welds showed higher hardness in the SZ because of grain refinement and the presence of deformed grains. The electron backscattered diffraction results suggested that the high-entropy alloy with low stacking-fault energy experienced recrystallization during friction stir welding, which was similar to other conventional materials with low stacking-fault energy.

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Evolution of microstructure and texture during thermo-mechanical processing of a two phase Al0.5CoCrFeMnNi high entropy alloy

Cited by 72 publications

References 50 publications

Strain-path controlled microstructure, texture and hardness evolution in cryo-deformed AlCoCrFeNi 2.1 eutectic high entropy alloy

Strain-path controlled microstructure, texture and hardness evolution in cryo-deformed AlCoCrFeNi 2.1 eutectic high entropy alloy

Effect of Heat Treatment and Titanium Addition on the Microstructure and Mechanical Properties of Cast Fe₃₁Mn₂₈ Ni₁₅Al_24.5Ti_x High-Entropy Alloys

Effects of rotational speed on the Al0.3CoCrCu0.3FeNi high-entropy alloy by friction stir welding

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Evolution of microstructure and texture during thermo-mechanical processing of a two phase Al0.5CoCrFeMnNi high entropy alloy

Cited by 72 publications

References 50 publications

Strain-path controlled microstructure, texture and hardness evolution in cryo-deformed AlCoCrFeNi 2.1 eutectic high entropy alloy

Strain-path controlled microstructure, texture and hardness evolution in cryo-deformed AlCoCrFeNi 2.1 eutectic high entropy alloy

Effect of Heat Treatment and Titanium Addition on the Microstructure and Mechanical Properties of Cast Fe31Mn28 Ni15Al24.5Tix High-Entropy Alloys

Effects of rotational speed on the Al0.3CoCrCu0.3FeNi high-entropy alloy by friction stir welding

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Effect of Heat Treatment and Titanium Addition on the Microstructure and Mechanical Properties of Cast Fe₃₁Mn₂₈ Ni₁₅Al_24.5Ti_x High-Entropy Alloys