Investigation on Phase Stability of AlxCo0.2Cr0.2Ni0.2Ti0.4 − x High Entropy Alloys

Zhao, Yunhao; Yang, Yu-Sheng; Lee, Chia-Hsien

doi:10.1007/s11669-018-0651-2

Cited by 10 publications

(3 citation statements)

References 41 publications

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“…14 ), which is ~7-times larger than that of our printed sample (~27.9 µm), likely due to the comparatively slower cooling rate, which leads to grain coarsening. In order to explore the mechanism of the existence of the FCC phase, a Scheil simulation 42 based on the Calculation of Phase Diagrams (CALPHAD) method was performed to predict the solidification path during cooling from the liquid phase. Based on the Scheil simulation, when cooling from ~1720 K, a single FCC phase is predicted to be formed and a 100% FCC phase is formed when cooling to ~1700 K (Fig.…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh-temperature melt printing of multi-principal element alloys

et al. 2022

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Multi-principal element alloys (MPEA) demonstrate superior synergetic properties compared to single-element predominated traditional alloys. However, the rapid melting and uniform mixing of multi-elements for the fabrication of MPEA structural materials by metallic 3D printing is challenging as it is difficult to achieve both a high temperature and uniform temperature distribution in a sufficient heating source simultaneously. Herein, we report an ultrahigh-temperature melt printing method that can achieve rapid multi-elemental melting and uniform mixing for MPEA fabrication. In a typical fabrication process, multi-elemental metal powders are loaded into a high-temperature column zone that can be heated up to 3000 K via Joule heating, followed by melting on the order of milliseconds and mixing into homogenous alloys, which we attribute to the sufficiently uniform high-temperature heating zone. As proof-of-concept, we successfully fabricated single-phase bulk NiFeCrCo MPEA with uniform grain size. This ultrahigh-temperature rapid melt printing process provides excellent potential toward MPEA 3D printing.

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Section: Resultsmentioning

confidence: 99%

Ultrahigh-temperature melt printing of multi-principal element alloys

et al. 2022

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“…While the fabrication of single-phase HEICs has not been reported before, we recognize that multicomponent intermetallic compounds have been observed widely in complex alloys including HEAs as secondary phases [6,[22][23][24][25][26]. Notably, Lu et al reported an eutectic HEA, AlCoCrFeNi2.1, and attributed the two phases as FCC and (ordered BCC-based) B2 based on Xray diffraction (XRD) [22].…”

Section: Introductionmentioning

confidence: 86%

“…CALPHAD modeling also suggested the existence of FCC-B2 two-phase regions in several HEAs [27]. Zhao et al recently investigated three Al xCo0.2Cr0.2Ni0.2Ti0.4-x multi-phase HEAs with substantial amounts of multicomponent B2 phases that presumably have three principal elements (Co, Cr, and Ni) on one sublattice and another two (Al and Ti) primarily on the other sublattice [26]; this represents perhaps one reported case that is the most close to (but not yet truly) HEICs (and not single-phase). Moreover, none of these prior studies aimed at fabricating and investigating singlephase HEICs.…”

Section: Introductionmentioning

confidence: 99%

Single-phase high-entropy intermetallic compounds (HEICs): bridging high-entropy alloys and ceramics

et al. 2019

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High-entropy intermetallic compounds (HEICs) were fabricated by mechanical alloying and spark plasma sintering to fill a knowledge gap between the traditional high-entropy alloys (HEAs) and emerging high-entropy ceramics (HECs). Notably, several four-or fivecomponent equimolar aluminides, such as the B2-phase (Fe1/5Co1/5Ni1/5Mn1/5Cu1/5)Al, have been made into single-phase HEICs for the first time. Thermodynamic modeling and a reversible, temperature-dependent, phase-stability experiment suggest that such B2-phase HEICs are entropy-stabilized phases. The structure of these HEICs resembles that of HECs with highentropy mixing of four or five elements of nearly equal fractions in one and only one sublattice, but with significant (~10%) anti-site defects (differing from typical HECs). A new phase stability rule for forming single B2-phase HEICs is proposed. Five additional HEICs of predominantly D022 phases have also been made. This study broadens the families of equimolar, single-phase, high-entropy materials that have been successfully fabricated.

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Phase Stability and Microhardness of the AlxCr2-xCoFeNi High-Entropy Alloys

Xiong

et al. 2021

J. Phase Equilib. Diffus.

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Investigation on Phase Stability of AlxCo0.2Cr0.2Ni0.2Ti0.4 − x High Entropy Alloys

Cited by 10 publications

References 41 publications

Ultrahigh-temperature melt printing of multi-principal element alloys

Ultrahigh-temperature melt printing of multi-principal element alloys

Single-phase high-entropy intermetallic compounds (HEICs): bridging high-entropy alloys and ceramics

Phase Stability and Microhardness of the AlxCr2-xCoFeNi High-Entropy Alloys

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