Room-temperature deformation of single crystals of transition-metal disilicides (TMSi2) with the C11b (TM = Mo) and C40 (TM = V, Cr, Nb and Ta) structures investigated by micropillar compression

Kishida, Kyosuke; Nakatsuka, Satoshi; Nose, Hiroaki; Inui, Haruyuki

doi:10.1016/j.actamat.2021.117468

Cited by 13 publications

(2 citation statements)

References 43 publications

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“…6 Variations in the resolved shear stress required for slip initiation as a function of the micropillar diameter (d) in the annealed, 15% cold-rolled, and 30% cold-rolled specimens, comparing with the previous results of fully annealed pure Al. 28,29) 0.66 13) ) according to eq. ( 1).…”

Section: Effect Of Cold Rolling On the Power-law Relationshipmentioning

confidence: 99%

Influence of Dislocation Substructure on Size-Dependent Strength of High-Purity Aluminum Single-Crystal Micropillars

et al. 2023

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In order to understand the influence of dislocation substructures on the size-dependent strength (smaller is stronger) of micron-sized metals, we have fabricated single-crystal cylindrical micropillars with various diameters approximately ranging from 1 to 10 µm, which were prepared on the surface of the fully annealed sample and the subsequently cold-rolled samples of high-purity aluminum (Al). The annealed micropillars exhibited a size dependence of the resolved shear stress required for slip. The shear stress (¸i) normalized by shear modulus (G) and the specimen diameter (d) normalized by Burgers vector (b) followed the correlation of ¸i/G = 0.33(d/b) ¹0.63 . The size-dependent strength was reduced by cold-rolling, resulting in lower power-law exponents (0.26³0.31) for the correlation in the cold-rolled specimens. The fine dislocation substructures introduced by the cold-rolling could be associated with the reduced size-dependent strength, which can be rationalized using the stochastic model of the dislocation source length in an assumption of homogenously distributed dislocations existing in the experimental micropillars. The inhomogeneous dislocation substructure with various dislocation cell sizes would contribute to a variation in the measured strength depending on the location, likely due to the probability of exiting the dislocation cell walls (local variation in dislocation density) in the micropillars fabricated on the cold-rolled Al samples.

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Section: Effect Of Cold Rolling On the Power-law Relationshipmentioning

confidence: 99%

Influence of Dislocation Substructure on Size-Dependent Strength of High-Purity Aluminum Single-Crystal Micropillars

et al. 2023

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“…Moreover, VSi 2 is of interest because of its more excellent optical anisotropy [9]. In previous studies, the structural stability, mechanical and thermodynamic properties of VSi 2 have been investigated by experimental and theoretical methods, and it has been shown that VSi 2 has excellent comprehensive properties [10][11][12][13]. It is well known that VSi 2 consists of two crystal structures, namely, the tetragonal C11 b structure and the hexagonal C40 structure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Vacancies on the Structural, Elastic, Electronic and Thermodynamic Properties of C11b-VSi2 by First-Principles Calculations

Duan

Peng

et al. 2022

Metals

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The effects of V and Si vacancies on structural stability, elastic properties, brittleness-toughness transition, Debye temperature and electronic properties of tetragonal C11b-VSi2 are investigated using the first-principles calculations. The vacancy formation energy and phonon dispersions confirm that perfect C11b-VSi2 and C11b-VSi2 with different atomic vacancies are thermodynamically and dynamically stable. The C11b-VSi2 with V-atom vacancies is more stable than that with Si-atom vacancies. The introduction of different atomic vacancies enhances the elastic modulus and its anisotropy of C11b-VSi2. The electron density difference and densities of state of perfect VSi2 and VSi2 with different vacancies are calculated, and the chemical bonding properties of perfect VSi2 and VSi2 with vacancies are discussed and analyzed. Additionally, the results show that the chemical bond strength of VSi2 is enhanced by the introduction of vacancies. Finally, Debye temperatures of perfect VSi2 and VSi2 with vacancies are also calculated.

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Room-temperature deformation of single crystals of the sigma-phase compound FeCr with the tetragonal D8b structure investigated by micropillar compression

et al. 2023

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Room-temperature deformation of single crystals of transition-metal disilicides (TMSi2) with the C11b (TM = Mo) and C40 (TM = V, Cr, Nb and Ta) structures investigated by micropillar compression

Cited by 13 publications

References 43 publications

Influence of Dislocation Substructure on Size-Dependent Strength of High-Purity Aluminum Single-Crystal Micropillars

Influence of Dislocation Substructure on Size-Dependent Strength of High-Purity Aluminum Single-Crystal Micropillars

Effects of Vacancies on the Structural, Elastic, Electronic and Thermodynamic Properties of C11b-VSi2 by First-Principles Calculations

Room-temperature deformation of single crystals of the sigma-phase compound FeCr with the tetragonal D8b structure investigated by micropillar compression

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