A general formulation for solid solution hardening effect in multicomponent alloys

Toda‐Caraballo, Isaac

doi:10.1016/j.scriptamat.2016.09.009

Cited by 113 publications

(34 citation statements)

References 41 publications

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“…Solid solution strengthening in such chemically complex alloys is of particular interest [3], as these systems typically exceed the constitutional range spanned by classical theories for the description of solid solution strengthening in dilute [4,5] and more concentrated [6] binary alloys. Accordingly, some efforts were made to develop models succeeding the current state of the description of solid solution strengthening [7][8][9][10]. The approach presented by Toda-Caraballo and Rivera-Díaz-del-Castillo [8] is based on the theory by Labusch [6] while it uses a generalization of the gradual changes of the lattice parameter and thus the misfit with composition in binary solid solution towards multi-component systems.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Lattice Distortion to Solid Solution Strengthening in a Series of Refractory High Entropy Alloys

Chen

Kauffmann

Laube

et al. 2017

Metall Mater Trans A

104

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We present an experimental approach for revealing the impact of lattice distortion on solid solution strengthening in a series of body-centered (bcc) Al-containing, refractory high entropy alloys from the Nb-Mo-Cr-Ti-Al system. By systematically varying the Nb and Cr content, a wide range of atomic size difference as a common measure for the lattice distortion was obtained. Single phase, bcc solid solutions were achieved by arc-melting and homogenization as well as verified by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The atomic radii of the alloying elements for determination of atomic size difference were recalculated on the basis of the mean atomic radii in and the chemical compositions of the solid solutions. Microhardness at room temperature correlates well with the deduced atomic size difference. Nevertheless, the mechanisms of microscopic slip lead to pronounced temperature dependence of mechanical strength. In order to account for this particular feature, we present a combined approach, using microhardness, nanoindentation and compression tests. The athermal proportion to the yield stress of the investigated equimolar alloys is revealed. These parameters support the universality of this aforementioned correlation. Hence, the pertinence of lattice distortion for solid solution strengthening in bcc high entropy alloys is proven.

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Section: Introductionmentioning

confidence: 99%

Contribution of Lattice Distortion to Solid Solution Strengthening in a Series of Refractory High Entropy Alloys

Chen

Kauffmann

Laube

et al. 2017

Metall Mater Trans A

104

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“…The first models that attempted to quantify this effect were introduced about seven decades ago; 1-4 since then, many refinements have been proposed, continuing to the present. [5][6][7][8][9][10][11][12][13][14][15] Recently, complex solid solutions comprising multiple principal elements, often referred to as high-entropy alloys (HEAs), a name coined by Yeh et al [Ref. 16], have been receiving tremendous attention in the literature [e.g., Refs.…”

mentioning

confidence: 99%

“…Recently, Toda-Caraballo et al 9,10,13 have proposed an extension of a classical SSS model for binary systems 4 to multicomponent systems, where the key parameters are the alloy's calculated unit cell parameter and its variation with composition. Curtin and co-workers 8 put forward a parameterfree and predictive SSS theory by approximating the multicomponent matrix as an effective medium having the average properties of the alloy and then calculated the solute-dislocation interaction energy from first principles for a multitude of configurations.…”

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confidence: 99%

Atomic displacement in the CrMnFeCoNi high-entropy alloy – A scaling factor to predict solid solution strengthening

et al. 2016

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Although metals strengthened by alloying have been used for millennia, models to quantify solid solution strengthening (SSS) were first proposed scarcely seventy years ago. Early models could predict the strengths of only simple alloys such as dilute binaries and not those of compositionally complex alloys because of the difficulty of calculating dislocation-solute interaction energies. Recently, models and theories of SSS have been proposed to tackle complex high-entropy alloys (HEAs). Here we show that the strength at 0 K of a prototypical HEA, CrMnFeCoNi, can be scaled and predicted using the root-mean-square atomic displacement, which can be deduced from X-ray diffraction and first-principles calculations as the isotropic atomic displacement parameter, that is, the average displacements of the constituent atoms from regular lattice positions. We show that our approach can be applied successfully to rationalize SSS in FeCoNi, MnFeCoNi, MnCoNi, MnFeNi, CrCoNi, CrFeCoNi, and CrMnCoNi, which are all medium-entropy subsets of the CrMnFeCoNi HEA.

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“…Recently, Toda‐Caraballo et al has proposed a methodology for computing solid solution hardening (SSH) in HEAs and compared the results with a collection of experimental data. They found that with the increase of Al in CoCuCrFeNiAl 0.45 and CoCuCrFeNiAl HEAs, the principal factor which is responsible for SSH is increased.…”

Section: Resultsmentioning

confidence: 99%

Microstructure, Mechanical Properties, and Oxidation Behavior of Al_xCr_0.4CuFe_0.4MnNi High Entropy Alloys

Rao

Wang

et al. 2017

Adv Eng Mater

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Al x Cr 0.4 CuFe 0.4 MnNi (x ¼ 0, 0.1, 0.2, 0.3, 0.4) high entropy alloys (HEAs) were prepared by coppermold casting. The effects of Al were investigated on the microstructure, tensile properties and oxidation behavior of these HEAs. It was shown that the addition of Al resulted in the formation of BCC and ordered BCC phases. The compositional heterogeneity between dendrites and interdendrites was alleviated when the content of Al was small. The mechanical properties of HEAs have been remarkably improved by the addition of Al. Considering the low cost and good mechanical properties, this kind of HEAs is rather competitive among HEAs for engineering application as structural materials. In this work, it was also shown that the oxidation resistance of current HEAs was significantly improved by the addition of Al.

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A general formulation for solid solution hardening effect in multicomponent alloys

Cited by 113 publications

References 41 publications

Contribution of Lattice Distortion to Solid Solution Strengthening in a Series of Refractory High Entropy Alloys

Contribution of Lattice Distortion to Solid Solution Strengthening in a Series of Refractory High Entropy Alloys

Atomic displacement in the CrMnFeCoNi high-entropy alloy – A scaling factor to predict solid solution strengthening

Microstructure, Mechanical Properties, and Oxidation Behavior of Al_xCr_0.4CuFe_0.4MnNi High Entropy Alloys

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A general formulation for solid solution hardening effect in multicomponent alloys

Cited by 113 publications

References 41 publications

Contribution of Lattice Distortion to Solid Solution Strengthening in a Series of Refractory High Entropy Alloys

Contribution of Lattice Distortion to Solid Solution Strengthening in a Series of Refractory High Entropy Alloys

Atomic displacement in the CrMnFeCoNi high-entropy alloy – A scaling factor to predict solid solution strengthening

Microstructure, Mechanical Properties, and Oxidation Behavior of AlxCr0.4CuFe0.4MnNi High Entropy Alloys

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Microstructure, Mechanical Properties, and Oxidation Behavior of Al_xCr_0.4CuFe_0.4MnNi High Entropy Alloys