Strengthening behavior of AlCoCrFeNi(TiN)  high-entropy alloy coatings fabricated by plasma spraying and laser remelting

Jin, Bingqian; Zhang, Nannan; Yin, Shuo

doi:10.1016/j.jmst.2021.12.055

Cited by 43 publications

(5 citation statements)

References 46 publications

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“…In the interface region, the size of the prior-β grains and α phase are smaller compared to the CMTAM zone, mainly due to the high cooling rate and rapid solidification during the laser remelting of the CMT layer. When the laser beam left remelting of the CMT layer occurs, which increases the subcooling and leads to an increase in nucleation drive and nucleation rate, promoting grain refinement [46][47][48], and when the cooling temperature of the remelting region is below the β→α phase transformation temperature, a solid-phase transformation occurs, resulting in a finer prior-β structure compared to the CMTAM region. The size of the α phase is also related to the cooling rate: the size of the α phase, as well as the size of the α colony, decreases with increasing cooling rate.…”

Section: Initial Microstructure Of the As-built Samplementioning

confidence: 99%

Hybrid Fabrication of Cold Metal Transfer Additive Manufacturing and Laser Metal Deposition for Ti6Al4V: The Microstructure and Dynamic/Static Mechanical Properties

Chen,

Liang,

et al. 2024

Materials

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The titanium alloy components utilized in the aviation field are typically large in size and possess complex structures. By utilizing multiple additive manufacturing processes, the precision and efficiency requirements of production can be met. We investigated the hybrid additive manufacturing of Ti-6Al-4V using a combination of cold metal transfer additive manufacturing (CMTAM) and laser metal deposition (LMD), as well as the feasibility of using the CMT-LMD hybrid additive manufacturing process for fabricating Ti-6Al-4V components. Microstructural examinations, tensile testing coupled with digital image correlation and dynamic compressive experiments (by the split Hopkinson pressure bar (SHPB) system) were employed to assess the parts. The results indicate that the interface of the LMD and CMTAM zone formed a compact metallurgical bonding. In the CMTAM and LMD zone, the prior-β grains exhibit epitaxial growth, forming columnar prior-β grains. Due to laser remelting, the CMT-LMD hybrid additive zone experiences grain refinement, resulting in equiaxed prior-β grains at the interface with an average grain size smaller than that of the CMTAM and LMD regions. The microstructures reveal significant differences in grain orientation and morphology among the zones, with distinct textures forming in each zone. In the CMT-LMD hybrid zone, due to interfacial strengthening, strain concentration occurs in the arc additive zone during tensile testing, leading to fracture on the CMTAM zone. Under high-strain-rate dynamic impact conditions, the LMD region exhibits ductile fracture, while the CMTAM zone demonstrates brittle fracture. The hybrid zone combines ductile and brittle fracture modes, and the CMT-LMD hybrid material exhibits superior dynamic impact performance compared to the single deposition zone.

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Section: Initial Microstructure Of the As-built Samplementioning

confidence: 99%

Hybrid Fabrication of Cold Metal Transfer Additive Manufacturing and Laser Metal Deposition for Ti6Al4V: The Microstructure and Dynamic/Static Mechanical Properties

Chen,

Liang,

et al. 2024

Materials

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“…The reduction in grain size was the greatest for SSLDTi only (77.3% for the α phase and 38.3% for the β phase in the recast layer, and 76.4% for the α phase in the HAZ) and the results were closer to the DSLD data. The results can be attributed to the rapid cooling caused by the auxiliary gas in laser drilling, which increases subcooling and promotes grain refinement in the recast layer [58,59]. Notably, SSLDTi→C/SiC exhibits larger grain size in the recast layer compared to SSLDTi only and DSLD due to prolonged exposure of molten Ti6Al4V to high temperatures during two trepans.…”

Section: Microstructural Change In Ti6al4vmentioning

confidence: 99%

Hole formation mechanisms in double-sided laser drilling of Ti6Al4V-C/SiC stacked materials

Gao,

Liu,

Liu

et al. 2024

Journal of Materials Processing Technology

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“…The Al 0.5 CoCrFeNi 2 Ti 0.5 -sprayed coatings could be suitable for applications at high temperatures, particularly at 600 °C to 800 °C as they possess higher hardness which are directly proportional to the wear-resistances of the materials [ 14 , 22 ]. Although most researchers have showed that better properties are obtained by heat treatments at 600 °C, in this study, the coatings heat-treated at 600 °C as shown in Figure 7 a,d had defects such as interlamellar cracks, which impacted negatively on their hardness and wear resistances [ 23 ].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al0.5CoCrFeNi2Ti0.5 Coatings

2022

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In this work, the microstructure and mechanical properties of atmospheric plasma-sprayed coatings of Al0.5CoCrFeNi2Ti0.5, prepared using gas-atomized powders at varying spray powers, are studied in as-sprayed and heat-treated conditions. Gas-atomized powders had spherical shapes and uniform element distributions, with major FCC phases and metastable BCC phases. The metastable BCC phase transformed to ordered and disordered BCC phases when sufficient energy was applied during the plasma-spraying process. During the heat treatment process for 2 hrs, disordered BCCs transformed into ordered BCCs, while the intensity of the FCC peaks increased. Spraying power plays a significant role in the microstructure and mechanical properties of plasma sprayed because at a high power, coatings exhibit better mechanical properties due to their dense microstructures resulting in less defects. As the plasma current was increased from 500 A to 700 A, the coatings’ hardness increased by approximately 21%, which is directly proportional to the decreased wear rate of the coatings at high spraying powers. As the coatings experienced heat treatments, the coatings sprayed with a higher spraying power showed higher hardness and wear resistances. Precipitation strengthening played a significant role in the hardness and wear resistances of the coatings due to the addition of the titanium element.

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Strengthening behavior of AlCoCrFeNi(TiN) high-entropy alloy coatings fabricated by plasma spraying and laser remelting

Cited by 43 publications

References 46 publications

Hybrid Fabrication of Cold Metal Transfer Additive Manufacturing and Laser Metal Deposition for Ti6Al4V: The Microstructure and Dynamic/Static Mechanical Properties

Hybrid Fabrication of Cold Metal Transfer Additive Manufacturing and Laser Metal Deposition for Ti6Al4V: The Microstructure and Dynamic/Static Mechanical Properties

Hole formation mechanisms in double-sided laser drilling of Ti6Al4V-C/SiC stacked materials

Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al0.5CoCrFeNi2Ti0.5 Coatings

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