Friction Stir Welding of a TRIP Fe49Mn30Cr10Co10C1 High Entropy Alloy

The effect of friction stir welding parameters on the structure and properties of Fe49Mn30Cr10Co10C1 high-entropy alloy welds was studied. Due to the development of the TRIP effect, the mechanical behaviour of this alloy was associated with the γ fcc-to-ε hcp martensitic transformation. In the initial condition, the microstructure of the program alloy comprised equiaxed fcc grains and small fractions of the hcp ε-martensite (~5%) and M23C6 carbides (~4%). Friction stir welding of the program alloy resulted in recrystallization of the stir zone and a decrease in the fraction of the carbides to 1–2%; however, the percentage of the hcp phase remained at nearly the same level as that in the initial condition. Post-welding tests showed a considerable increase in the strength and microhardness of the welds both due to the recrystallization-induced decrease in grain size and martensitic transformation.

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Friction stir welding of a CoCrFeNiAl0.3 high entropy alloy

Materials Letters ◽

10.1016/j.matlet.2017.06.073 ◽

2017 ◽

Vol 205 ◽

pp. 142-144 ◽

Cited By ~ 42

Author(s):

Z.G. Zhu ◽

Y.F. Sun ◽

M.H. Goh ◽

F.L. Ng ◽

Q.B. Nguyen ◽

...

Keyword(s):

Friction Stir Welding ◽

High Entropy Alloy ◽

High Entropy ◽

Friction Stir

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Friction Stir Welding of the Carbon-Doped Dual-Phase High Entropy Alloy

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.316.364 ◽

2021 ◽

Vol 316 ◽

pp. 364-368

Author(s):

Dmitry Shaysultanov ◽

Kazimzhon Raimov ◽

Nikita Stepanov

Keyword(s):

Friction Stir Welding ◽

Volume Fraction ◽

Cast Alloy ◽

High Yield ◽

High Entropy Alloy ◽

Induction Melting ◽

Face Centered Cubic ◽

High Entropy ◽

Friction Stir ◽

Average Grain Size

Fe49Mn30Cr10Co10C1 high entropy alloy (HEA) is produced by induction melting. The as-cast alloy is cold rolled and annealed at 900°C, to produce fine recrystallized structure before friction stir welding (FSW). The structure of the annealed alloy consists of a recrystallized face-centered cubic (fcc, γ) and hexagonal close-packed (hcp, ε) phases with volume fractions of 91% and 5%, respectively, as well as M23C6 carbides with the volume fraction of 4%. Sound weld without visible defects, such as porosity or cracks, are obtained. Friction stir welding results in a decrease in the average grain size from 7.0 to 1.9 μm in the stir zone. The volume fraction of the M23C6 carbides decreases to 1% after FSW. The alloy shows high yield strength and ultimate tensile strength of 475 MPa and 865 MPa, respectively, together with elongation of 70%.

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Friction stir welding of a сarbon-doped CoCrFeNiMn high-entropy alloy

Materials Characterization ◽

10.1016/j.matchar.2018.08.063 ◽

2018 ◽

Vol 145 ◽

pp. 353-361 ◽

Cited By ~ 34

Author(s):

D. Shaysultanov ◽

N. Stepanov ◽

S. Malopheyev ◽

I. Vysotskiy ◽

V. Sanin ◽

...

Keyword(s):

Friction Stir Welding ◽

High Entropy Alloy ◽

High Entropy ◽

Friction Stir

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

High Temperature Materials and Processes ◽

10.1515/htmp-2020-0046 ◽

2020 ◽

Vol 39 (1) ◽

pp. 556-566 ◽

Cited By ~ 1

Author(s):

Po-Ting Lin ◽

Chan-Sheng Wu ◽

Chun-Hao Peng ◽

Che-Wei Tsai ◽

Yutaka S. Sato

Keyword(s):

Friction Stir Welding ◽

Cubic Boron Nitride ◽

Stacking Fault ◽

Stacking Fault Energy ◽

High Entropy Alloy ◽

Electron Backscattered Diffraction ◽

High Entropy ◽

Practical Applications ◽

Friction Stir ◽

Microhardness Distribution

AbstractWelding 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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