Effect of Si additions on the Al2O3 grain refinement upon oxidation of Cr2AlC MAX phase

Shang, Lin; Gokuldoss, Pradeep Konda; Sandlöbes, Stefanie; Baben, Moritz to; Schneider, Jochen M.

doi:10.1016/j.jeurceramsoc.2016.11.050

Cited by 14 publications

(18 citation statements)

References 28 publications

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“…A selected-area electron diffraction (SAED) pattern (inset of Figure 1) recorded from a sample with an identical chemical composition to that reported in Ref. [16] was consistent with the formation of the Cr 2 Al(Si)C MAX phase.…”

Section: Resultssupporting

confidence: 79%

“…Although the segregations may or may not be crystalline, the volume fraction of the precipitations may be too small to be detected using XRD (assuming that they are crystalline). Furthermore, no positive phase identification of the precipitates could be obtained using SAED [16]. The Si rich precipitations, which have a thickness of ∼ 5-10 nm and a length on the order of 250 nm, should be visible using TEM and hence should be detectable using SAED.…”

Section: Resultsmentioning

confidence: 99%

“…MAX phases of Cr 2 AlC and Cr 2 Al(Si)C with 0.7 at.% Si were synthesized using DC magnetron sputtering in an industrial chamber (CC800/9, Cemecon AG, Germany). Further synthesis details can be found in Ref [16]. Oxidation was performed using a Carbolite HTF-1700 laboratory furnace at 1120°C for 4 h in air.…”

Section: Methodsmentioning

confidence: 99%

“…We recently showed that the addition of Si as a fourth alloying element in the minor amount of 0.7 at.% (determined by energy-dispersive X-ray spectroscopy (EDX)) to the Cr 2 AlC MAX phase can enhance the Al 2 O 3 layer thickness by ∼ 40% upon oxidation at 1120°C in air for 4 h [16,17]. It was also observed that the Cr 2 Al(Si)C MAX phase exhibited retarded grain growth during oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…Detailed near atomic-scale characterization using atom probe tomography (APT) did not reveal the presence of Si, even in trace amounts, either in the Al 2 O 3 layer or in the chromium carbide layer located immediately below the Al 2 O 3 layer. However, APT revealed the incorporation of up to 1.3 ± 0.2 at.% Si into the MAX phase after oxidation [16]. Hence, the role of Si in the retardation of MAX phase grain growth is currently not understood.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Nano-scale Si segregation and precipitation in Cr₂Al(Si)C MAX phase coatings impeding grain growth during oxidation

Pradeep

Chang

Kovács

et al. 2019

Materials Research Letters

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We recently reported that the columnar grain width of Cr 2 AlC MAX phase coatings increases during oxidation (4 h at 1120°C) by 80%, while for 0.7 at.% Si additions to Cr 2 AlC, coarsening of only 12% was observed. Here, we use nm scale compositional and microstructural investigations to identify significant differences between Cr 2 AlC and Cr 2 Al(Si)C. In particular, needle-shaped precipitates coarsen into globular Cr 3 Si precipitates upon oxidation in the Si-containing MAX phase. We infer that the presence of these precipitates, which are located predominantly along grain boundaries in the MAX phase, retards coarsening during oxidation by Zener pinning. IMPACT STATEMENT This is the first report of Zener pinning in MAX phases. We show that Si additions to Cr 2 AlC cause the formation of precipitates, which retard grain coarsening during oxidation.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nano-scale Si segregation and precipitation in Cr₂Al(Si)C MAX phase coatings impeding grain growth during oxidation

Pradeep

Chang

Kovács

et al. 2019

Materials Research Letters

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Combinatorial Alloy Design: Renaissance in the Accelerated Development of High-Entropy Alloys

Sadhasivam,

Kumar,

Saha

et al. 2024

Trans Indian Natl. Acad. Eng.

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Work of adhesion of interfaces between M2AlC (M = Ti, V, Cr) MAX phases and α-Al2O3

Kwakernaak

Sloof

2018

Ceramics International

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A fast and generic scheme is proposed to calculate the work of adhesion between two different materials or the cohesive energy between two crystal planes in a material. These calculations make use of the regular solution theory. This theory is extended to describe chemical interactions between atoms at either side of an interface. The so-called regular solution parameter is estimated from thermodynamic values tabulated or solution enthalpies obtained from a macroscopic atom model (MAM). Complex surface definitions at either side of an interface, both in composition and position of atoms, can be dealt with. The proposed scheme has been used to calculate the work of adhesion between M 2 AlC (M = Ti, V, Cr) type MAX phases and -Al 2 O 3. Next, the cohesive energy of the MAX-phases and alumina were determined. The cohesion of the M 2 AlC type MAX-phase is the weakest bond present in the M 2 AlC--Al 2 O 3 systems.

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Effect of Si additions on the Al2O3 grain refinement upon oxidation of Cr2AlC MAX phase

Cited by 14 publications

References 28 publications

Nano-scale Si segregation and precipitation in Cr₂Al(Si)C MAX phase coatings impeding grain growth during oxidation

Nano-scale Si segregation and precipitation in Cr₂Al(Si)C MAX phase coatings impeding grain growth during oxidation

Combinatorial Alloy Design: Renaissance in the Accelerated Development of High-Entropy Alloys

Work of adhesion of interfaces between M2AlC (M = Ti, V, Cr) MAX phases and α-Al2O3

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Effect of Si additions on the Al2O3 grain refinement upon oxidation of Cr2AlC MAX phase

Cited by 14 publications

References 28 publications

Nano-scale Si segregation and precipitation in Cr2Al(Si)C MAX phase coatings impeding grain growth during oxidation

Nano-scale Si segregation and precipitation in Cr2Al(Si)C MAX phase coatings impeding grain growth during oxidation

Combinatorial Alloy Design: Renaissance in the Accelerated Development of High-Entropy Alloys

Work of adhesion of interfaces between M2AlC (M = Ti, V, Cr) MAX phases and α-Al2O3

Contact Info

Product

Resources

About

Nano-scale Si segregation and precipitation in Cr₂Al(Si)C MAX phase coatings impeding grain growth during oxidation

Nano-scale Si segregation and precipitation in Cr₂Al(Si)C MAX phase coatings impeding grain growth during oxidation

Work of adhesion of interfaces between M2AlC (M = Ti, V, Cr) MAX phases and α-Al2O3