Analysis of Si addition on phase formation in AlCoCrCuFeNiSix high entropy alloys

Kumar, Anil; Dhekne, Pushkar Prakash; Swarnakar, Akhilesh Kumar; Chopkar, Manoj

doi:10.1016/j.matlet.2016.10.099

Cited by 74 publications

(17 citation statements)

References 13 publications

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“…For example, mechanochemical covalent chemical reactions have been reported ( Andersen and Mack, 2018b ; Bolm and Hernández, 2019 ; Tan and García, 2019 ), spanning classical condensation ( Haferkamp et al, 2019 ) or cyclization ( Andersen and Mack, 2017 ) reactions through to metal-catalyzed ( Pickhardt et al, 2020 ) or piezocatalyzed reactions ( Kubota et al, 2019 ). Regarding inorganic materials, syntheses and modifications have been described for hydrated oxides ( MacKenzie et al, 1999 ; Mehrotra et al, 2016 ; Alex et al, 2020 ), mixed oxides and ceramics ( Balaz et al, 1994 ; Mackenzie et al, 2000 ; Temuujin et al, 2000 ; MacKenzie and Barneveld, 2006 ), silicates ( Temuujin et al, 1998a ; Temuujin et al, 1998b ; MacKenzie et al, 2007 ), and high entropy alloys ( Kumar et al, 2017 ; Balcerzak et al, 2019 ; Kamalakannan et al, 2019 ), amongst many others. We note that the pictographic representation is equally applicable to any reactions that occur as a result of mechanical action from across all aspects of chemical reactivity, Figure 14 .…”

Section: A Need For More?mentioning

confidence: 99%

Tribochemistry, Mechanical Alloying, Mechanochemistry: What is in a Name?

Michalchuk

Болдырева²,

Belenguer³

et al. 2021

Front. Chem.

151

108

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Over the decades, the application of mechanical force to influence chemical reactions has been called by various names: mechanochemistry, tribochemistry, mechanical alloying, to name but a few. The evolution of these terms has largely mirrored the understanding of the field. But what is meant by these terms, why have they evolved, and does it really matter how a process is called? Which parameters should be defined to describe unambiguously the experimental conditions such that others can reproduce the results, or to allow a meaningful comparison between processes explored under different conditions? Can the information on the process be encoded in a clear, concise, and self-explanatory way? We address these questions in this Opinion contribution, which we hope will spark timely and constructive discussion across the international mechanochemical community.

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Section: A Need For More?mentioning

confidence: 99%

Tribochemistry, Mechanical Alloying, Mechanochemistry: What is in a Name?

Michalchuk

Болдырева²,

Belenguer³

et al. 2021

Front. Chem.

151

108

View full text Add to dashboard Cite

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“…The latter is more likely to occur in the presence of Cr while the former occurs in the presence of Ni. The simultaneous occurrence of these two elements is expected to lead to the formation of complex reaction layers between SiC and the surrounding matrix, dominated by the Cr carbides formation according to the sequence SiC/Cr 5 Si 3 C/ Cr 7 C 3 /Cr 23 C 6 /Cr [42].…”

Section: Resultsmentioning

confidence: 99%

SPS-assisted Synthesis of SIC_p reinforced high entropy alloys: reactivity of SIC and effects of pre-mechanical alloying and post-annealing treatment

et al. 2017

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In this work a traditional high entropy alloy (FeCoNiCrAl) was reinforced by uniformly distributed reactive silicon carbide (SiC) particles by a powder metallurgy synthetic route, using as precursors simply mixed powders or mechanically prealloyed ones. The reactive sintering produced a single isomorphic BCC structure. The sample microstructure resulted equiassic, more homogenous in samples based on prealloyed powders. The instability of SiC in the presence of metal precursors resulted in the formation of more stable carbides and silicides, as well as in carbon diffusion in the high entropy alloy matrix and partially unreacted SiC particles. The formation of these newly formed fine precipitates, as well as the presence of residual SiC were useful to increase the hardness of the alloy

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“…Al0.6Si0.3, on the other hand, only exhibits a BCC-type phase in an as-cast state, showing that the Si-addition favors the formation of a BCC crystal structure. This was mainly attributed to the lower valence electron concentration in Si [27]. shows a BSE scanning electron microscopy (SEM)-micrograph and the corresponding EDS-mapping results of Al0.6 in its as-cast state.…”

Section: Methodsmentioning

confidence: 99%

Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al0.6CrFeCoNi and Al0.6CrFeCoNiSi0.3 High-Entropy Alloys

Chen

Bobzin

Zhou

et al. 2018

Metals

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High-entropy alloys exhibit some interesting mechanical properties including an excellent resistance against softening at elevated temperatures. This gives high-entropy alloys (HEAs) great potential as new structural materials for high-temperature applications. In a previous study of the authors, oxidation behavior of Al0.6CrFeCoNi and Al0.6CrFeCoNiSi0.3 high-entropy alloys at T = 800 °C, 900 °C and 1000 °C was investigated. Si-alloying was found to increase the oxidation resistance by promoting the formation of a continuous Al2O3 layer, avoiding the formation of AlN at T = 800 °C. Obvious phase changes were identified in the surface areas of both alloys after the oxidation experiments. However, the effects of heat treatment and Si-alloying on the phase transition in the bulk were not investigated yet. In this study, Al0.6CrFeCoNi and Al0.6CrFeCoNiSi0.3 high-entropy alloys were heat-treated at T = 800 °C and T = 1000 °C to investigate the effect of heat treatment on microstructure, phase composition and mechanical properties of both alloys. The results show that alloying Al0.6CrFeCoNi with Si caused a phase transition from dual phases consisting of BCC and FCC to a single BCC phase in an as-cast condition. Furthermore, increased hardness for as-cast and heat-treated samples compared with the Al0.6CrFeCoNi alloy was observed. In addition, the heat treatment facilitated the phase transition and the precipitation of the intermetallic phase, which resulted in the change of the mechanical properties of the alloys.

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Analysis of Si addition on phase formation in AlCoCrCuFeNiSix high entropy alloys

Cited by 74 publications

References 13 publications

Tribochemistry, Mechanical Alloying, Mechanochemistry: What is in a Name?

Tribochemistry, Mechanical Alloying, Mechanochemistry: What is in a Name?

SPS-assisted Synthesis of SIC_p reinforced high entropy alloys: reactivity of SIC and effects of pre-mechanical alloying and post-annealing treatment

Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al0.6CrFeCoNi and Al0.6CrFeCoNiSi0.3 High-Entropy Alloys

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Analysis of Si addition on phase formation in AlCoCrCuFeNiSix high entropy alloys

Cited by 74 publications

References 13 publications

Tribochemistry, Mechanical Alloying, Mechanochemistry: What is in a Name?

Tribochemistry, Mechanical Alloying, Mechanochemistry: What is in a Name?

SPS-assisted Synthesis of SICp reinforced high entropy alloys: reactivity of SIC and effects of pre-mechanical alloying and post-annealing treatment

Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al0.6CrFeCoNi and Al0.6CrFeCoNiSi0.3 High-Entropy Alloys

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SPS-assisted Synthesis of SIC_p reinforced high entropy alloys: reactivity of SIC and effects of pre-mechanical alloying and post-annealing treatment