Microstructure of NiCoAlFeCuCr multi-component systems synthesized by mechanical alloying

Gómez-Esparza, C.D.; Ochoa‐Gamboa, R.A.; Estrada-Guel, I.; Cabañas-Moreno, J. Gerardo; Villarruel, Juan Ignacio Barajas; Morquecho, Ana María Arizmendi; Ramirez, José Martin Herrera; Martínez-Sánchez, R.

doi:10.1016/j.jallcom.2010.12.105

Cited by 16 publications

(7 citation statements)

References 9 publications

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“…[13][14][15][16] In contrast, nano-crystalline, homogeneous, stable, or metastable HEAs can be processed by mechanical alloying. [17][18][19][20][21][22][23] Milling variables (e.g., milling time, velocity, and media) influence the alloying, grain refinement, and final mechanical properties of the bulk compacts. [24][25][26] Among the HEA systems, CoCrFeNi have been extensively investigated over the past 13 years.…”

Section: Introductionmentioning

confidence: 99%

Phase Stability of a Mechanically Alloyed CoCrCuFeNi High Entropy Alloy

2017

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A CoCrCuFeNi high entropy alloy (HEA) is prepared from the high purity elemental Co,Cr, Cu,Fe, and Ni powders by mechanical alloying (MA) at different milling speed (200 or 350 rpm). Mechanically alloyed powder samples are subsequently annealed at different temperatures (300, 500, 700, and 800 C). Microstructures, chemical composition, and phase stability of the powders are studied using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and energy dispersive X-ray spectrometry (EDS). The results show that, a single phase stable FCC solid solution is formed within 5 and 50 h of milling at 350 and 200 rpm, respectively. The single FCC phase is identified to be thermally stable upto 800 C and then it is decomposed into two FCC phases. The second FCC phase is found to be rich in Cu. The precipitation of the Cu rich phase is likely due to the positive enthalpy of mixing of Cu with other alloying elements.

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Section: Introductionmentioning

confidence: 99%

Phase Stability of a Mechanically Alloyed CoCrCuFeNi High Entropy Alloy

2017

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“…Numerous compositions of n-element alloys (n > 5) have been studied experimentally [10][11][12][13][14][15][16][17][18][19][20][21], all showing that HEA tend to form simple crystal structures (bcc or fcc solid solutions or a combination of both). Experimental studies also include the role of constituents or alloying additions on properties [22][23][24][25][26][27][28][29][30][31][32][33][34][35]. However, relative to the extensive experimental work, theoretical work is somewhat lacking, limited to an analysis of the concepts and conditions underlying the field of HEA [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Determination of the transition to the high entropy regime for alloys of refractory elements

Grosso

Bozzolo

Mosca

2012

Journal of Alloys and Compounds

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“…The sintered samples were studied in the plane perpendicular to the axis of the cylinder. This processing route is described in detail in . The samples chosen for this study contained only phases with simple space groups (SG), that is,

F m \overset{3}{true} m

I m \overset{3}{true} m

, etc.…”

Section: Methodsmentioning

confidence: 99%

“…The characterization of these phases is frequently made by X‐ray diffraction (XRD). An XRD study of our mechanically alloyed NiCoAlFeCuCr system, using Cu Kα radiation, has already been performed . However, fluorescence and the extensive overlap of the diffraction peaks among the different existing phases, due to low crystalline quality (small crystallite size and high microdeformations), and/or variations in the local chemical compositions, made precise phase identification very difficult.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous XEDS‐EBSD Study of NiCoAlFeCu(Cr,Ti) Multi‐Component Alloys

et al. 2017

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NiCoAlFeCu, NiCoAlFeCuCr, and NiCoAlFeCuCrTi high-entropy alloys are prepared by mechanical alloying and sintered at 1200 C and a pressure of 1.5 GPa for 3 h. The alloys were characterized by X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and X-ray energy dispersive spectrometry (XEDS). The phases found are mostly variants of the face centered cubic (fcc) phases (space group Fm 3m), bcc (space group Im 3m), and hexagonal (space group P6 3 /mmc). Adding Ti to the NiCoAlFeCuCr system has strong effects on the solubility of the elements in the different phases and increases dramatically the number of phases present. The use of EBSD and XEDS allowed identification of a cubic phase in NiCoAlFeCu samples, which cannot be identified by XRD alone, and confirmed its identification by XRD in NiCoAlFe-CuCr samples. The spatial distribution of phases and the grain structure in the three different samples, measured by EBSD and XEDS, is reported.

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Microstructure of NiCoAlFeCuCr multi-component systems synthesized by mechanical alloying

Cited by 16 publications

References 9 publications

Phase Stability of a Mechanically Alloyed CoCrCuFeNi High Entropy Alloy

Phase Stability of a Mechanically Alloyed CoCrCuFeNi High Entropy Alloy

Determination of the transition to the high entropy regime for alloys of refractory elements

Simultaneous XEDS‐EBSD Study of NiCoAlFeCu(Cr,Ti) Multi‐Component Alloys

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