Elastic properties of B2-ordered NiAl and NiAl–X (Cr, Mo, W) alloys

Frommeyer, G.; Rablbauer, R.; Schäfer, Harald

doi:10.1016/j.intermet.2009.07.026

Cited by 70 publications

(35 citation statements)

References 35 publications

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“…3 Studies for fiber-reinforced NiAl-X eutectic alloys have shown that NiAl alloyed with the refractory bcc metals Cr, Mo, and W possesses promising strength at high temperatures and improved room-temperature ductility. 4 Ductility enhancement was found in NiAl-Cr(Mo)-Hf-Ti alloys, where the disordered bcc (Ti, Hf) solid solution phase together with the Heusler phase Ni 2 Al (Ti, Hf) precipitation presented at eutectic cell boundaries is responsible for the improved ductility due to the better deformation ability of the (Ti, Hf) solid solution phase. 5 In the above-mentioned examples the ductility improvement was achieved mainly through the formation of a specific microstructure.…”

Section: Introductionmentioning

confidence: 99%

Site preference and effect of alloying on elastic properties of ternaryB2 NiAl-based alloys

et al. 2012

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Using the exact muffin-tin orbitals method in conjunction with the coherent potential approximation, we study the site preference of transition metal impurities X (X = Sc, Ti, V, Cr, W, Re, Co) in B2 NiAl and their effect on its elastic properties. Analyzing interatomic bonding of NiAl-X alloys and elastic characteristics evaluated from the elastic constants C 11 , C 12 , and C 44 , we predict that the addition of W, V, Ti, and Re atoms could yield improved ductility for B2 NiAl-X alloys without significant changes in the macroscopic elastic moduli.

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Section: Introductionmentioning

confidence: 99%

Site preference and effect of alloying on elastic properties of ternaryB2 NiAl-based alloys

et al. 2012

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“…Various techniques such as fiber reinforcement, precipitation strengthening, microalloying and macroalloying can improve room-temperature ductility by a formation of specific microstructure [2], [3], [4], [5]. In our previous paper [6] we analyzed substitutional alloying on brittle vs. ductile behavior of B2 NiAl-X (X = Sc, Ti, V, Cr, W, Re, Co) alloys examining at atomic level the role of interatomic bonding in the ductility enhancement.…”

Section: Introductionmentioning

confidence: 99%

Effect of Re content on elastic properties of B2 NiAl from ab initio calculations

Ponomareva

Vekilov

Abrikosov

2014

Journal of Alloys and Compounds

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The effect of substitutional alloying of Re on elastic properties of B2 NiAl has been studied using first-principles electronic-structure calculations by the exact muffintin orbitals method and the coherent potential approximation. Our calculations have shown that elastic constants C 12 , C 44 and bulk modulus B of (N i 1−x Re x )Al alloys increase with Re composition almost linearly, but concentration dependence of elastic constants C 11 , Young modulus E, shear modulus G, G/B ratio and the Cauchy pressure P C is strongly nonmonotonously and has peculiarities near the concentration x= 30 at. % Re. Analyzing the density of states and Fermi surface sections we establish a direct connection between the behavior of the elastic constants of (N i 1−x Re x )Al alloys and changes in the interatomic bonding and Fermi surface topology.

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“…The role of interfaces in strain partitioning in composites was emphasized by a number of authors [8,9]. In particular, Nibased [3] and especially NiAl-based composites are the focus of current research because they can operate at high temperatures (up to 1300 ∘ C) in corrosive environments [10][11][12][13][14][15][16][17]. They can be used for high temperature applications including structural components in energy conversion facilities, for example.…”

Section: Introductionmentioning

confidence: 99%

“…The spherical shape of the indent was chosen in order to prevent the interplay between the specific shape of the indent with the crystal lattice anisotropy. of NiAl ( = 1674 ∘ C) [13]. The elastic moduli of pure NiAl and Cr single crystals along the ⟨111⟩ directions are 277 and 248 GPa, respectively [11].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation and X-Ray Microdiffraction Study of Strain Partitioning in a Layered Nanocomposite

Barabash

Agarwal

Korić

et al. 2016

Journal of Crystallography

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The depth-dependent strain partitioning across the interfaces in the growth direction of the NiAl/Cr(Mo) nanocomposite between the Cr and NiAl lamellae was directly measured experimentally and simulated using a finite element method (FEM). Depth-resolved X-ray microdiffraction demonstrated that in the as-grown state both Cr and NiAl lamellae grow along the ⟨111⟩ direction with the formation of as-grown distinct residual ∼0.16% compressive strains for Cr lamellae and ∼0.05% tensile strains for NiAl lamellae. Three-dimensional simulations were carried out using an implicit FEM. First simulation was designed to study residual strains in the composite due to cooling resulting in formation of crystals. Strains in the growth direction were computed and compared to those obtained from the microdiffraction experiments. Second simulation was conducted to understand the combined strains resulting from cooling and mechanical indentation of the composite. Numerical results in the growth direction of crystal were compared to experimental results confirming the experimentally observed trends.

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Elastic properties of B2-ordered NiAl and NiAl–X (Cr, Mo, W) alloys

Cited by 70 publications

References 35 publications

Site preference and effect of alloying on elastic properties of ternaryB2 NiAl-based alloys

Site preference and effect of alloying on elastic properties of ternaryB2 NiAl-based alloys

Effect of Re content on elastic properties of B2 NiAl from ab initio calculations

Finite Element Simulation and X-Ray Microdiffraction Study of Strain Partitioning in a Layered Nanocomposite

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