An investigation of elastic moduli of vanadium-chromium alloys

Lenkkeri, Jaakko; Lahteenkorva, E E

doi:10.1088/0305-4608/8/8/006

Cited by 39 publications

(17 citation statements)

References 11 publications

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“…In this case, the materials with relatively low values of Young's moduli close to the values of human tissue (10-60 GPa) are needed to ensure biomechanical compatibility and uniform load distribution, avoiding bone degradation. [16], green [18] and black [17] colors. The data obtained by the PAW-SQS method in this paper are denoted by red triangles.…”

Section: Resultsmentioning

confidence: 99%

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Ab initio calculations of elastic properties of alloys with mechanical instability: Application to BCC Ti-V alloys

et al. 2018

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Section: Resultsmentioning

confidence: 99%

“…It is therefore important to establish how different computational methods deal with the instability in simulations of elastic properties of bcc Ti alloys. The elastic moduli of Ti-V system have been studied in several experimental [16][17][18] and theoretical works [19][20][21]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Ab initio calculations of elastic properties of alloys with mechanical instability: Application to BCC Ti-V alloys

et al. 2018

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“…The elastic constants of five polycrystalline and four single crystal Cr-V alloys were measured using the resonant ultrasound spectroscopy in this study. In addition, Lenkkeri and Lahteenkorva [40] previously measured the elastic constants of six polycrystalline Cr-V alloys, single crystal Cr and V using the pulse echo method.…”

Section: Resultsmentioning

confidence: 99%

Phase stability and elastic properties of Cr–V alloys

Gao

Suzuki

Schweiger³

et al. 2013

J. Phys.: Condens. Matter

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V is the only element in the periodic table that forms a complete solid solution with Cr and thus is particularly important in alloying strategy to ductilize Cr. This study combines first-principles density functional theory calculations and experiments to investigate the phase stability and elastic properties of Cr-V binary alloys. The cluster expansion study reveals the formation of various ordered compounds at low temperatures that were not previously known. These compounds become unstable due to the configurational entropy of bcc solid solution as the temperature is increased. The elastic constants of ordered and disordered compounds are calculated at both T = 0 K and finite temperatures. The overall trends in elastic properties are in agreement with measurements using the resonant ultrasound spectroscopy method. The calculations predict that addition of V to Cr decreases both the bulk modulus and the shear modulus, and enhances the Poisson's ratio, in agreement with experiments. Decrease in the bulk modulus is correlated to decrease in the valence electron density and increase in the lattice constant. An enhanced Poisson's ratio for bcc Cr-V alloys (compared to pure Cr) is associated with an increased density of states at the Fermi level. Furthermore, the difference charge density in the bonding region in the (110) slip plane is highest for pure Cr and decreases gradually as V is added. The present calculation also predicts a negative Cauchy pressure for pure Cr, and it becomes positive upon alloying with V. The intrinsic ductilizing effect from V may contribute, at least partially, to the experimentally observed ductilizing phenomenon in the literature.

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“…Due to the unavailability of moduli data for the a-Cr and r phases, the bulk modulus of 161 GPa reported for pure Cr at room temperature [41] was used for both of these phases as an approximation, due to the high amount of Cr likely to be present in these phases.…”

Section: Modelling Of the Bulk Modulus Of Phasesmentioning

confidence: 99%

“…The Poisson's ratios of a-Cr and r phase have yet to be determined, and hence, the reported value of 0.21 for pure Cr at room temperature [41] was used for both of these phases here as an approximation.…”

Section: Modelling Of Poisson's Ratios Of the Phasesmentioning

confidence: 99%

Modelling the coefficient of thermal expansion in Ni-based superalloys and bond coatings

et al. 2016

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The coefficient of thermal expansion (CTE) of nickel-based superalloys and bond coat layers was modelled by considering contributions from their constituent phases. The equilibrium phase composition of the examined materials was determined using thermodynamic equilibrium software with an appropriate database for Nibased alloys, whereas the CTE and elastic properties of the principal phases were modelled using published data. The CTEs of individual phases were combined using a number of approaches to determine the CTE of the phase aggregate. As part of this work, the expansion coefficients of the superalloy IN-738LC and bond coat Amdry-995 were measured as a function of temperature and compared with the model predictions. The predicted values were also validated with the published data for the single-crystal superalloy CMSX-4 and a number of other Ni-based alloy compositions at 1000 K. A very good agreement between experiment and model output was found, especially up to 800 C. The modelling approaches discussed in this paper have the potential to be an extremely useful tool for the industry and for the designers of new coating systems.

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An investigation of elastic moduli of vanadium-chromium alloys

Cited by 39 publications

References 11 publications

Ab initio calculations of elastic properties of alloys with mechanical instability: Application to BCC Ti-V alloys

Ab initio calculations of elastic properties of alloys with mechanical instability: Application to BCC Ti-V alloys

Phase stability and elastic properties of Cr–V alloys

Modelling the coefficient of thermal expansion in Ni-based superalloys and bond coatings

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