Phase and thermal study of equiatomic AlCuCrFeMnW high entropy alloy processed via spark plasma sintering

Kumar, Deepak; Maulik, Ornov; Kumar, Saurav; Prasad, Y. V. S. S.; Kumar, Vinod

doi:10.1016/j.matchemphys.2017.08.049

Cited by 40 publications

(7 citation statements)

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“…The wetting was enhanced only after addition of active element (Zr) to Ag alloy 47 . In another research, Chen et al reported that the addition of Cr as an active element in PdNi alloy promoted the brazing C-C composite 41 . Similar results were reported by He et al for the joining of SiC ceramics with Au-Ni-Pd-Ti brazing alloy 42 .…”

Section: Resultsmentioning

confidence: 98%

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Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Sharma

Ahn

2021

Sci Rep

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In this work, we studied the brazing characteristics of Al2O3 and 3D printed Ti–6Al–4V alloys using a novel equiatomic AlZnCuFeSi high entropy alloy filler (HEAF). The HEAF was prepared by mechanical alloying of the constituent powder and spark plasma sintering (SPS) approach. The filler microstructure, wettability and melting point were investigated. The mechanical and joint strength properties were also evaluated. The results showed that the developed AlZnCuFeSi HEAF consists of a dual phase (Cu–Zn, face-centered cubic (FCC)) and Al–Fe–Si rich (base centered cubic, BCC) phases. The phase structure of the (Cu–Al + Ti–Fe–Si)/solid solution promises a robust joint between Al2O3 and Ti–6Al–4V. In addition, the joint interfacial reaction was found to be modulated by the brazing temperature and time because of the altered activity of Ti and Zn. The optimum shear strength reached 84 MPa when the joint was brazed at 1050 °C for 60 s. The results can be promising for the integration of completely different materials using the entropy driven fillers developed in this study.

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Section: Resultsmentioning

confidence: 98%

“…The FCC and BCC phase fractions in bulk HEAF were 0.67 and 0.33. The yield strength (YS) and the microhardness of the HEAF were related through the following equation 41 : …”

Section: Resultsmentioning

confidence: 99%

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Sharma

Ahn

2021

Sci Rep

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“…54 Although carbon and oxygen are considered impurities here, it has been reported that formation of fine and strong secondary phases such as carbides and oxides can improve the mechanical properties of HEAs. [55][56][57][58] The crystallite size of the alloy after SPS the 18 h milled sample is given in Table 1. As can be seen, the 18 h milled sample has a nanocrystalline structure.…”

Section: Microstructure and Phase Evolution After Spsmentioning

confidence: 99%

Non-equiatomic W₁₀Mo₂₇Cr₂₁Ti₂₂Al₂₀ high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties

Naser-Zoshki¹,

Rashid²,

Vahdati-Khaki³

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this work, non-equiatomic W10Mo27Cr21Ti22Al20 refractory high-entropy alloy (RHEA) was produced using mechanical alloying followed by spark plasma sintering. The phase formation, microstructure, and compressive mechanical properties of the alloy were studied. During mechanical alloying, a Body-centered cubic (BCC) solid solution phase with a particle size of less than 1 µm was obtained after 18 h ball milling. The microstructure of the sintered sample exhibits three distinct phases consisting of two solid solution phases BCC1 and BCC2 as well as fine TiCxOy precipitates distributed in them. The volume fractions of each phase were about 79%, 8%, and 13%, respectively. The sintered W10Mo27Cr21Ti22Al20 showed yield strengths of 2465, 1506, 405, and 290 MPa at room temperature 600, 1000, and 1200°C, respectively, which are about twice that of the same refractory high-entropy alloy produced by vacuum arc melting. At 1000 and 1200°C, the strength after yielding gradually increased to 970 and 718 MPa at a compressive strain of 60%. The studied refractory high-entropy alloy can have good potential in high-temperature applications due to its high specific strength at elevated temperatures compared to conventional Ni-based superalloys and most as-reported refractory high-entropy alloys.

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“…8(a), Mohanty et al [83] showed that the primary FCC phase in an AlCoCrFeNi alloy remains relatively stable up to SPS processing temperatures of 1173 K (900°C). Kumar et al [84] [ Fig. 8(b [85], whereas in TiZrNbHfTa [42], there is a transition from singlephase to multiphase and back to single-phase through an annealing temperature range of 300-1100°C.…”

Section: Phase Stabilitymentioning

confidence: 99%

Nanostructured high-entropy materials

2020

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Phase and thermal study of equiatomic AlCuCrFeMnW high entropy alloy processed via spark plasma sintering

Cited by 40 publications

References 20 publications

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Non-equiatomic W₁₀Mo₂₇Cr₂₁Ti₂₂Al₂₀ high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties

Nanostructured high-entropy materials

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Phase and thermal study of equiatomic AlCuCrFeMnW high entropy alloy processed via spark plasma sintering

Cited by 40 publications

References 20 publications

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Non-equiatomic W10Mo27Cr21Ti22Al20 high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties

Nanostructured high-entropy materials

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Non-equiatomic W₁₀Mo₂₇Cr₂₁Ti₂₂Al₂₀ high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties