Tailoring of the thermal expansion of Cr2(Alx,Ge1−x)C phases

Cabioc’h, Thierry; Eklund, Per; Mauchamp, Vincent; Jaouen, M.; Barsoum, Michel W.

doi:10.1016/j.jeurceramsoc.2012.10.008

Cited by 107 publications

(62 citation statements)

References 64 publications

(87 reference statements)

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“…The ability to alloy on the M, A, or X site [42,[65][66][67][68][69][70][71] or create artificial superstructures composed of different MAX phases would allow for possible routes to affect/tune electronic, magnetic, and mechanical properties without affecting the inherent atomically laminated structure. In addition, a new family of two-dimensional (2D) materials known as MXenes was recently discovered, realized by etching the A layers from the MAX phase [72,73].…”

Section: Discussionmentioning

confidence: 99%

Magnetically driven anisotropic structural changes in the atomic laminateMn2GaC

et al. 2016

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Inherently layered magnetic materials, such as magnetic M n+1 AX n (MAX) phases, offer an intriguing perspective for use in spintronics applications and as ideal model systems for fundamental studies of complex magnetic phenomena. The MAX phase composition M n+1 AX n consists of M n+1 X n blocks separated by atomically thin A-layers where M is a transition metal, A an A-group element, X refers to carbon and/or nitrogen, and n is typically 1, 2, or 3. Here, we show that the recently discovered magnetic Mn 2 GaC MAX phase displays structural changes linked to the magnetic anisotropy, and a rich magnetic phase diagram which can be manipulated through temperature and magnetic field. Using first-principles calculations and Monte Carlo simulations, an essentially one-dimensional (1D) interlayer plethora of two-dimensioanl (2D) Mn-C-Mn trilayers with robust intralayer ferromagnetic spin coupling was revealed. The complex transitions between them were observed to induce magnetically driven anisotropic structural changes. The magnetic behavior as well as structural changes dependent on the temperature and applied magnetic field are explained by the large number of low energy, i.e., close to degenerate, collinear and noncollinear spin configurations that become accessible to the system with a change in volume. These results indicate that the magnetic state can be directly controlled by an applied pressure or through the introduction of stress and show promise for the use of Mn 2 GaC MAX phases in future magnetoelectric and magnetocaloric applications.

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Section: Discussionmentioning

confidence: 99%

Magnetically driven anisotropic structural changes in the atomic laminateMn2GaC

et al. 2016

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“…In recent years, ternary carbide Cr 2 AlC has attracted much attention because of its excellent high-temperature oxidation and hot corrosion resistance [14,[25][26][27], due to preferential formation of continuous protective Al 2 O 3 oxide at high temperatures [15]. Moreover, a small difference in thermal expansion coefficients between Cr 2 AlC and Ni-based alloys makes them along with Cr 2 (Al x ,Ge 1−x )C, potential protective film candidates at high temperature [28,29].…”

Section: Introductionmentioning

confidence: 99%

Sputtering Power Effects on Growth and Mechanical Properties of Cr2AlC MAX Phase Coatings

Naveed

Obrosov

Żak

et al. 2016

Metals

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Abstract:Coating growth and mechanical properties of nanolamellar Cr 2 AlC coatings at various sputtering power were investigated in the present study. Cr 2 AlC coating was deposited on the IN 718 superalloy and (100) Si wafers by DC magnetron sputtering at different sputtering powers. The structure and properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nanoindentation. It was found that coatings had columnar structure with nanocrystalline substructure. Deposition rate increased with the sputtering power. XRD results showed the presence of the Cr 2 AlC MAX phase, intermetallic AlCr 2 and Cr 7 C 3 carbide phases, along with the change in preferential coating growth orientation. TEM observations confirmed the occurrence of these phases, and the SAED patterns demonstrated significant texture of the coatings. Hardness values were measured in the range between 11-14 GPa, showing a slight increase with the sputtering power.

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“…Bei et al [17], for example, investigated Ti 2 Al 1−x Sn x C solid solutions and concluded that the addition of low melting elements in the A sublattice of aluminum-containing MAX phases could lead to reduction of oxidationinduced crack healing temperatures. Cabioch et al [18] proposed the partial substitution of Al for Ge in the Cr 2 Al 1−x Ge x C 2 system as a strategy to tune the thermal expansion coefficient in this system. Yu et al [19] investigated Cr 2 (Al,Si)C solid solutions and concluded that partial substitution of Al for Si had positive effects on the strength of the material.…”

Section: Introductionmentioning

confidence: 99%

Does aluminum play well with others? Intrinsic Al-A alloying behavior in 211/312 MAX phases

Arróyave

Talapatra

Duong

et al. 2016

Materials Research Letters

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The search for further control over the properties of MAX phases as well as the promise of discovering compounds with new functionalities has resulted in an increased interest in MAX solid solutions resulting from mixing in either the M, A, or X sublattices. The possibility of alloying MAX compounds not only enables finer tuning of their properties but can also be used to stabilize compounds that may otherwise be metastable in their pure state. In this letter, we present an ab initio-based investigation of the intrinsic alloying behavior in the A sublattice of Ti 2 (Al,A)C, Zr 2 (Al,A)C and Ti 3 (Al,A)C 2 MAX compounds. IMPACT STATEMENTIn this work, we present for the first time a comprehensive study of the intrinsic alloying tendencies in MAX solid solutions with (Al,A) mixing in the A sublattice. ARTICLE HISTORY

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Tailoring of the thermal expansion of Cr2(Alx,Ge1−x)C phases

Abstract: We report thermal expansion coefficients of the end members and solid-solution compounds in

Cited by 107 publications

References 64 publications

Magnetically driven anisotropic structural changes in the atomic laminateMn2GaC

Magnetically driven anisotropic structural changes in the atomic laminateMn2GaC

Sputtering Power Effects on Growth and Mechanical Properties of Cr2AlC MAX Phase Coatings

Does aluminum play well with others? Intrinsic Al-A alloying behavior in 211/312 MAX phases

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