Über Atomabstände in Metallen

Goldschmidt, V. M.

doi:10.1515/zpch-1928-13327

Cited by 82 publications

(10 citation statements)

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“…The main reason why the charge transfer is the dominant factor for the atomic-level pressure in the 3d CCAs is that the differences in the atomic sizes among the elements considered here are relatively small. Figure 3b presents the average values of the final atomic radii R f,solute measured by extended X-ray absorption fine structure (EXAFS) and the pure atomic radii (Goldschmidt 26 , Pauling 27 ) of the constituent elements in the 3d CCAs. We compare these values with the zero pressure atomic radius (Fig.…”

Section: Resultsmentioning

confidence: 99%

Engineering atomic-level complexity in high-entropy and complex concentrated alloys

et al. 2019

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Quantitative and well-targeted design of modern alloys is extremely challenging due to their immense compositional space. When considering only 50 elements for compositional blending the number of possible alloys is practically infinite, as is the associated unexplored property realm. In this paper, we present a simple property-targeted quantitative design approach for atomic-level complexity in complex concentrated and high-entropy alloys, based on quantum-mechanically derived atomic-level pressure approximation. It allows identification of the best suited element mix for high solid-solution strengthening using the simple electronegativity difference among the constituent elements. This approach can be used for designing alloys with customized properties, such as a simple binary NiV solid solution whose yield strength exceeds that of the Cantor high-entropy alloy by nearly a factor of two. This study provides general design rules that enable effective utilization of atomic level information to reduce the immense degrees of freedom in compositional space without sacrificing physics-related plausibility.

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Section: Resultsmentioning

confidence: 99%

Engineering atomic-level complexity in high-entropy and complex concentrated alloys

et al. 2019

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“…%) of each constituent element in the HEA is higher than that in typical dilute solid solutions, and there is no clear way to differentiate between “solvent” and “solute” atoms in an equiatomic alloy, we make a rough estimate by assuming that the atoms with the largest and smallest sizes are the “solvent” and “solute” atoms, respectively. As tabulated in Table 4 , Co and Mn have, respectively, the largest and smallest Goldschmidt radii 54 , which results in an atomic size (radius) misfit of 1.05% for this pair. The extent of solid solution hardening in the HEA can then be calculated by assuming the Fleischer and modified Labusch models 49 50 51 as a function of solute concentration for a series of hypothetical Co-Mn binary alloys and the results are plotted in Fig.…”

Section: Discussionmentioning

confidence: 99%

Size effect, critical resolved shear stress, stacking fault energy, and solid solution strengthening in the CrMnFeCoNi high-entropy alloy

Okamoto

Fujimoto

Kambara

et al. 2016

Sci Rep

344

103

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High-entropy alloys (HEAs) comprise a novel class of scientifically and technologically interesting materials. Among these, equatomic CrMnFeCoNi with the face-centered cubic (FCC) structure is noteworthy because its ductility and strength increase with decreasing temperature while maintaining outstanding fracture toughness at cryogenic temperatures. Here we report for the first time by single-crystal micropillar compression that its bulk room temperature critical resolved shear stress (CRSS) is ~33–43 MPa, ~10 times higher than that of pure nickel. CRSS depends on pillar size with an inverse power-law scaling exponent of –0.63 independent of orientation. Planar ½ < 110 > {111} dislocations dissociate into Shockley partials whose separations range from ~3.5–4.5 nm near the screw orientation to ~5–8 nm near the edge, yielding a stacking fault energy of 30 ± 5 mJ/m2. Dislocations are smoothly curved without any preferred line orientation indicating no significant anisotropy in mobilities of edge and screw segments. The shear-modulus-normalized CRSS of the HEA is not exceptionally high compared to those of certain concentrated binary FCC solid solutions. Its rough magnitude calculated using the Fleischer/Labusch models corresponds to that of a hypothetical binary with the elastic constants of our HEA, solute concentrations of 20–50 at.%, and atomic size misfit of ~4%.

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“…One can discuss only half of the nearest interatomic distances in the lattice of similar kinds of atoms or atomic sizes of atoms of different kinds in a compound. This approach has been utilized by Goldschmidt [62]. (2) As we are talking about metallic glasses, all bounds are considered to be non-directional.…”

Section: Discussionmentioning

confidence: 99%

Role of different factors in the glass-forming ability of binary alloys

et al. 2014

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International audienceIn the present work, we discuss the glass-forming ability of various binary alloys in which the glassy phase was not formed even by melt spinning technique with high cooling rate of the melt up to 1 MK/s (some consisted of partly glassy phase), though by commonly accepted guidelines, these alloys could be as good glass-formers as many other binary glasses. The alloys studied belong to binary systems with multiple eutectics; the constituent elements have a negative enthalpy of mixing, and a significant variability of atomic size differences is observed from system to system. The results indicate the necessity of taking into account simultaneously various factors influencing the glass-forming ability including melt fragility

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Über Atomabstände in Metallen

Cited by 82 publications

References 0 publications

Engineering atomic-level complexity in high-entropy and complex concentrated alloys

Engineering atomic-level complexity in high-entropy and complex concentrated alloys

Size effect, critical resolved shear stress, stacking fault energy, and solid solution strengthening in the CrMnFeCoNi high-entropy alloy

Role of different factors in the glass-forming ability of binary alloys

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