Effects of process parameters on microstructure and mechanical properties of Al0.5CoCrFeNi high entropy alloy thin sheets using pinless friction stir welding

Moghanni, Hossein; Dehghani, K.; Shafiei, Ali

doi:10.1016/j.jmrt.2021.12.050

Cited by 24 publications

(3 citation statements)

References 56 publications

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“…Figure 4 e,f show the magnification of the junction of the NZ and HAZ on the receding side (RS) and advancing side (AS), respectively. It can easily be seen that the boundary junction of the NZ and HAZ on the AS is more clearly defined compared to the RS, and the HAZ region is wider on the AS compared to the RS [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of 7A52 Aluminum Alloy Thin Sheet Repaired with Friction Stir Surfacing

Li,

Shi,

Han

et al. 2024

Materials

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A solid-state repair technique based on surface friction welding is investigated in depth to achieve excellent mechanical properties of damaged 7A52 aluminum alloy. The results show that the yield strength and tensile strength along the repair direction are 436 MPa and 502 MPa, respectively, at a rotational speed of 1400 rpm and a travel speed of 300 mm/min, which are about 157.9% and 129.7% of those before the defects were repaired, respectively, while the elongation is 17.2% compared to the base material. Perpendicular to the repair direction, the yield strength and tensile strength are 254 MPa and 432 MPa, which are 111.4% and 129.7% of those before the defects were repaired, respectively, while the elongation is 11.8% compared to the base material. The mechanical properties of the repaired areas are still improved compared to those of the defect-free sheets. On the one hand, this is attributed to the dynamic recrystallization of the nugget zone due to the thermo-mechanical coupling, resulting in the formation of a fine, equiaxed grain structure; on the other hand, the precipitated Mg2Si phase, which is incoherent within the base material, transforms into the Al12(Fe, Mn)3Si phase, as well as the precipitation of the Al6Mn phase and η′ phase, resulting in the enhancement of the properties. The material fracture at the junction of the nugget zone and the heat-affected zone occurs after repair, which is attributed to the significant difference in the texture of the nugget zone and the heat-affected zone, as well as to the stress concentration at the junction.

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Section: Resultsmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of 7A52 Aluminum Alloy Thin Sheet Repaired with Friction Stir Surfacing

Li,

Shi,

Han

et al. 2024

Materials

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“…Fig. 1 shows the XRD patterns of the HEAs after homogenization at 1150 °C for 24 h. It should be noted that the homogenization duration and temperature were determined based on previous studies and ~0.7T m , respectively, where Tm represents the theoretical melting points of the HEAs calculated through thermo-physical calculations (32,33). The FCC phase is present in all the alloys, as seen by the (111), ( 200), (220), and (311) reflections of the FCC crystal structure.…”

Section: Structural and Microstructural Evolution Of The Heasmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of Y Added CoCrFeNi High-entropy Alloys Produced by Arc-melting

Polat,

Kotan

2024

Hittite Journal of Science and Engineering

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The CoCrFeNi high entropy alloy (HEA) with face-centered cubic (FCC) crystal structure exhibits excellent ductility values even at cryogenic temperatures. However, since this HEA is relatively weak in strength, it may not meet the requirements of industrial applications in terms of strength-ductility trade-off. Therefore, the systematic addition of yttrium (Y) into CoCrFeNi HEA was investigated in the present study to increase the strength by solid solution and second phase strengthening. The HEAs were produced by vacuum arc melting, suction casting, and subsequent homogenization at 1150 °C for 24 h. The structural development of the HEAs was investigated by using the X-ray diffraction (XRD) technique revealing the formation of a solid solution phase and Ni3Y-type hexagonal structure (HS) second phase. The corresponding microstructure of the HEAs was examined under a scanning electron microscope (SEM) revealing the transformation of the microstructure from elongated grains to nearly equiaxed grains with the increase of Y content from 2 at. % to 4 at. %. The mechanical properties of the HEAs were investigated by using hardness and compression tests. The results exhibited a dramatic increase in the hardness from 143 (±2) HV to 335 (±7) HV and in the yield strength from 130 MPa to 1025 MPa with 4 at. % Y addition. Our study has revealed that the addition of rare earth Y element results in further development in the strength of the CoCrFeNi for potential engineering applications.

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“…They showed that the Al-Cu interface featured a good metallurgy bonding because of the Al2Cu/AlCu/Al4Cu9 compound formation. Recently, Moghanni et al [20] investigated the influence of process parameters in the pinless FSW on microstructural and mechanical characteristics of 1.2-mm-thick Al-0.5Co-Cr-Fe-Ni high-entropy alloy sheets. The authors observed that the heating index played a significant role in the microstructures and mechanical properties of the jointed samples.…”

Section: Introductionmentioning

confidence: 99%

Development of a novel GTAW process for joining ultra-thin metal sheets

Manh¹,

Nguyen

Han

et al. 2022

Journal of Manufacturing Processes

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Effects of process parameters on microstructure and mechanical properties of Al0.5CoCrFeNi high entropy alloy thin sheets using pinless friction stir welding

Cited by 24 publications

References 56 publications

Microstructure Evolution and Mechanical Properties of 7A52 Aluminum Alloy Thin Sheet Repaired with Friction Stir Surfacing

Microstructure Evolution and Mechanical Properties of 7A52 Aluminum Alloy Thin Sheet Repaired with Friction Stir Surfacing

Microstructural Evolution and Mechanical Properties of Y Added CoCrFeNi High-entropy Alloys Produced by Arc-melting

Development of a novel GTAW process for joining ultra-thin metal sheets

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