Characterization of Oxide Dispersed AlCoCrFe High Entropy Alloy Synthesized by Mechanical Alloying and Spark Plasma Sintering

Sathiyamoorthi, Praveen; Anupam, Ameey; Sirasani, Teja; Murty, B.S.; Kottada, Ravi Sankar

doi:10.1007/s12666-013-0268-4

Cited by 61 publications

(13 citation statements)

References 24 publications

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“…However, the increase in the hardness, the room-temperature compressive yield strength, the relative density and the atomic size difference with an increase in the cumulative atomic fraction of Ta, Ti, Cr and V in the W matrix reveal the dominant role of solid-solution strengthening, which increases with an increase in the fraction of the constituent atoms and the atomic size difference 65 . In addition to the elastic interaction between the stress field of dislocations and atoms 65 , which accounts for nearly fifty percent of the strength of HEA 72, 98, 148 , the dynamic drag effect, which arises due to non-uniform stresses and causes acceleration and deceleration of dislocation sliding, leads to strong strengthening as well 98 .…”

Section: Resultsmentioning

confidence: 99%

Powder Metallurgy Processing of a WxTaTiVCr High-Entropy Alloy and Its Derivative Alloys for Fusion Material Applications

Waseem

Ryu

2017

Sci Rep

139

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The WxTaTiVCr high-entropy alloy with 32at.% of tungsten (W) and its derivative alloys with 42 to 90at.% of W with in-situ TiC were prepared via the mixing of elemental W, Ta, Ti, V and Cr powders followed by spark plasma sintering for the development of reduced-activation alloys for fusion plasma-facing materials. Characterization of the sintered samples revealed a BCC lattice and a multi-phase structure. The selected-area diffraction patterns confirmed the formation of TiC in the high-entropy alloy and its derivative alloys. It revealed the development of C15 (cubic) Laves phases as well in alloys with 71 to 90at.% W. A mechanical examination of the samples revealed a more than twofold improvement in the hardness and strength due to solid-solution strengthening and dispersion strengthening. This study explored the potential of powder metallurgy processing for the fabrication of a high-entropy alloy and other derived compositions with enhanced hardness and strength.

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Section: Resultsmentioning

confidence: 99%

Powder Metallurgy Processing of a WxTaTiVCr High-Entropy Alloy and Its Derivative Alloys for Fusion Material Applications

Waseem

Ryu

2017

Sci Rep

139

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“…There exist some studies that reported the non-equilibrium processing methods such as rapid solidification and mechanical alloying to obtain better physical and chemical properties like avoiding component segregation, improving solubility, producing nanocrystalline, stable microstructures with better homogeneity and etc. in the HEA systems (Praveen et al, 2013;Mridha et al, 2013).…”

Section: 1thermodynamic and Phase Stabilitymentioning

confidence: 99%

The microstructure and mechanical behavior of modern high temperature alloys

Samaei

Mirsayar²,

Aliha³

2015

10.5267/j.esm

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Over the past decades, high entropy alloys (HEAs) have attracted continuously increasing research efforts because of their technological promise for structural applications and their scientific interest as a multi-component alloy exhibiting an overall random solid solution structure with high mixing entropy at high temperature. In this summary, we briefly review the recent studies focused on the structure and mechanical behavior of HEAs, covering the important issues from phase stability to elastic modulus, mechanical strength, hardness and fatigue resistance. Finally, we highlight a few key findings recently reported for HEAs and discuss the outstanding issues yet to be resolved.

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“…It should be noted that aluminum is the strongest stabilizer of the BCC structure in the present system [36]. In studies conducted by Praveen et al [37], who obtained the same alloy using MA and sintering, the σ-phase was additionally identified (together with M 23 C 6 carbides) using diffraction analysis. Presently, its lack of sigma, or its smaller concentration, is connected with a longer milling time (35 h), as well as with a higher sintering temperature (1050 °C/15 min).…”

Section: Microstructure Analysis Of Al25co25cr25fe25mentioning

confidence: 82%

“…Additionally, the high number of elements led to a decrease in stacking fault energy, which elevates the amount of dislocations and, consequently, blocks their movements and strengthens the material. Praveen et al [37] obtained a hardness of 1050 HV in the same alloy, consolidated using SPS, however, they applied different milling and sintering conditions, which could have resulted in higher hardness. It should be noted that the value of CS obtained in the present study is one of the highest values listed in the literature on HEAs and is similar to WC-Co systems [69].…”

Section: Mechanical Property Analysismentioning

confidence: 99%

Microstructure and Mechanical Properties of Al–Co–Cr–Fe–Ni Base High Entropy Alloys Obtained Using Powder Metallurgy

et al. 2019

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Four different compositions of high entropy alloys based on Al-Co-Cr-Fe and Al-Co-Cr-Fe-Ni systems were prepared using mechanical alloying and consolidation by spark plasma sintering. The chemical compositions of the studied alloys were experimentally selected to obtain a BCC solid solution and mixtures of BCC with FCC. The microstructure of the Al25Co25Cr25Fe25 (all in at%) high entropy alloy consisted of a matrix with a high concentration of Al, Co and Fe, in which spherical grains (50-200 nm) enriched in Cr were embedded. Both the matrix and grains had body centered cubic structures. The addition of nickel to a four-element system led to the formation of a multiphase composition. The microstructure of the Al20Co20Cr20Fe20Ni20, Al10Co30Cr20Fe35Ni5 and Al15Co30Cr15Fe40Ni5 HEAs consisted of fine grains measuring 50-500 nm composed of: AlNi-B2, BCC phase, FCC or BCC solid solutions and σ-sigma phase, respectively. The complex structure of the studied samples resulted in changeable mechanical properties. The highest compression strength of 3920 MPa was accompanied by an increased yield strength of 3500 MPa, and a low strain of 0.7%, for the Al25Co25Cr25Fe25 alloy. The addition of Ni led to the formation of plastic FCC phases responsible for a decrease in strength with increases in ductility, which, in the new non-equiatomic Al10Co30Cr20Fe35Ni5 high entropy alloy reached 6.3% at a yield strength of 1890 MPa and compression strength of 2230 MPa. The conducted abrasion studies revealed that non-equilibrium high entropy alloys have the highest abrasion resistance.

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Characterization of Oxide Dispersed AlCoCrFe High Entropy Alloy Synthesized by Mechanical Alloying and Spark Plasma Sintering

Cited by 61 publications

References 24 publications

Powder Metallurgy Processing of a WxTaTiVCr High-Entropy Alloy and Its Derivative Alloys for Fusion Material Applications

Powder Metallurgy Processing of a WxTaTiVCr High-Entropy Alloy and Its Derivative Alloys for Fusion Material Applications

The microstructure and mechanical behavior of modern high temperature alloys

Microstructure and Mechanical Properties of Al–Co–Cr–Fe–Ni Base High Entropy Alloys Obtained Using Powder Metallurgy

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