Properties of a high-strength ultrafine-grained CoCrFeNiMn high-entropy alloy prepared by short-term mechanical alloying and spark plasma sintering

Průša, Filip; Šenková, Alexandra; Kučera, Vojtěch; Čapek, Jaroslav; Vojtěch, Dalibor

doi:10.1016/j.msea.2018.08.014

Cited by 64 publications

(25 citation statements)

References 49 publications

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“…It can be attributed to the dramatic reduction in the lattice strain and annihilation of the defects during the sintering process that can facilitate the atomic reordering and phase transformation . The decomposition of FCC and specifically BCC phases has been observed in the previous researches …”

Section: Discussionmentioning

confidence: 87%

“…[35,36] The decomposition of FCC and specifically BCC phases has been observed in the previous researches. [11,17,27,37]…”

Section: Phase Evaluationmentioning

confidence: 99%

“…A subsequent sintering process (via SPS) leads to the high value of mechanical properties such as hardness. [27] The solid solution and grain boundary strengthening contribute to the excess hardness for the produced alloy. [53] Moreover, the tetragonal phases such as sigma can act as the second-phase particles and can be the barrier to dislocation motion.…”

Section: Microstructure and Hardnessmentioning

confidence: 99%

“…[26] In another case, the precipitation of the second phases can activate the pinning effect and can prevent grain growth, leading to an alloy with a fine-grained microstructure. [27,28] Consequently, by controlling the processing conditions and appropriate selection of the alloying elements, a desired HEA can be fabricated. The main challenge in this area is the prediction and identification of the new phases formed in the microstructure.…”

Section: Introductionmentioning

confidence: 99%

“…In some cases, these phases have a beneficial effect that can improve the low‐ and high‐temperature mechanical properties of the alloy . In another case, the precipitation of the second phases can activate the pinning effect and can prevent grain growth, leading to an alloy with a fine‐grained microstructure . Consequently, by controlling the processing conditions and appropriate selection of the alloying elements, a desired HEA can be fabricated.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

et al. 2019

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The microstructure and phase evolution of the mechanically alloyed FeCoNiMnV high entropy alloy during spark plasma sintering are examined. The milled powders are sintered at different temperatures ranging between 500 C and 1000 C. A multiphase structure is produced during the sintering process. The produced alloy experiences different types of decompositions and phase formations as the sintering temperature is raised. During sintering at different temperatures, the body centered cubic and face centered cubic (FCC) phases are transformed to new FCC and tetragonal phases. According to the results, V does not show the tendency to dissolve into the structure and the tetragonal phases, mainly composed of V and Mn, tending to be formed in addition to the FCC solid solution. Sintering at 900 C results in the grain size of about 220 nm, attaining the highest hardness of about 450 HV. The sintered alloy at 1000 C shows the highest relative density (about 98%) with an average grain size of about 580 nm. The phase formation is predicted and evaluated by different criteria, and the consistency between the theoretical and experimental results is explained.

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Section: Discussionmentioning

confidence: 87%

“…[35,36] The decomposition of FCC and specifically BCC phases has been observed in the previous researches. [11,17,27,37]…”

Section: Phase Evaluationmentioning

confidence: 99%

Section: Microstructure and Hardnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

et al. 2019

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Oxidation Behavior of Mechanically Alloyed High‐Entropy Alloys: A Review

Dikonda,

Anupam,

Vaidya

2024

Adv Eng Mater

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High‐entropy alloys (HEAs) owing to their entropy maximized design exhibit simple solid solution structures and possess fascinating properties. In addition to mechanical properties, the oxidation resistance is an important property that is crucial for determining the suitability of high‐temperature operation of the structural members. Among processing routes, mechanical alloying is one of the most widely used techniques primarily due to the generation of nanocrystalline grains and alloying elements with wide melting point differences. Mechanically alloyed HEAs differ from cast alloys in several aspects, including the phases developed, microstructure, oxidation products, and mass gain kinetics. This difference is largely attributed to the presence of numerous grain boundaries in mechanically alloyed HEAs, which serve as significant diffusion paths. This article aims to provide a comprehensive overview of oxidation studies performed in several mechanically alloyed HEAs, detailing their microstructure, oxidation products, and kinetics. It also compares the oxidation behavior of few of these systems with their cast counterparts. The oxidation behavior is further analyzed from both thermodynamic and kinetic perspectives. Finally, the article suggests several future research directions that can further the understanding of oxidation behavior of mechanically alloyed HEAs and contribute to their development.

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In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co_0.22Cr_0.23Fe_0.29Ni_0.20Ti_0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

Kovalev,

Vadchenko,

Rogachev

2024

Adv Eng Mater

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In this report, the effect of Ti addition on the phase evolution of a near‐equiatomic CoCrFeNi‐based high‐entropy alloy (HEA) during annealing in a vacuum is described. The HEA Co0.22Cr0.23Fe0.29Ni0.20Ti0.06 is synthesized through mechanical alloying of constituent elements for a milling duration of 1 h. The as‐prepared HEA is a two‐phase alloy containing body centred cubic (BCC) precipitates in an face centred cubic (FCC) matrix. The thermal stability of the HEA is experimentally studied by subjecting it to 5 h of isothermal annealing at 600, 800, and 1000 °C, using high‐temperature X‐ray diffraction (HTXRD). The HTXRD analysis indicates a noteworthy reduction in the BCC phase content after isothermal annealing at 600 °C. The formation of intermetallic σ‐phases does not occur. At temperatures of 800 and 1000 °C, the alloy matrix exhibits a single‐phase FCC solid solution. At 800 and 1000 °C, HEA undergoes partial oxidation, resulting in the formation of oxide phases on the surface and within the particles of the powder in the form of nanoscale inclusions. This oxidation depletes the metal matrix with titanium, leading to a change in the composition of the HEA. The alloy transforms into a CoCrFeNi solid solution containing 3–4 at% Ti. Thus, the alloy matrix phase remains a stable FCC solid solution.

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Properties of a high-strength ultrafine-grained CoCrFeNiMn high-entropy alloy prepared by short-term mechanical alloying and spark plasma sintering

Cited by 64 publications

References 49 publications

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

Oxidation Behavior of Mechanically Alloyed High‐Entropy Alloys: A Review

In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co_0.22Cr_0.23Fe_0.29Ni_0.20Ti_0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

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Properties of a high-strength ultrafine-grained CoCrFeNiMn high-entropy alloy prepared by short-term mechanical alloying and spark plasma sintering

Cited by 64 publications

References 49 publications

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

Oxidation Behavior of Mechanically Alloyed High‐Entropy Alloys: A Review

In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co0.22Cr0.23Fe0.29Ni0.20Ti0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

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In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co_0.22Cr_0.23Fe_0.29Ni_0.20Ti_0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling