The fine structure of dislocations in ni<sub>3</sub>v

Francois, A.; Hug, G.; Veyssière, P.

doi:10.1080/01418619208201556

Cited by 27 publications

(12 citation statements)

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“…This is valid for isotropic materials having a Poisson's ratio of 1/3, and the Poisson's ratio of microtwinned Ni 3 V is reported to be 0.354. 18 The difference in anharmonic heat capacity, ⌬C anh (T)ϭC anh PD (T)ϪC anh O (T) was calculated to be ⌬C anh (T)ϭϪ2.43ϫ10 Ϫ4 T ͑J/mol/K͒. This expression predicts the wrong sign for the ⌬C anh (T) ͑primarily because the elastic modulus of the partially disordered sample is smaller than that of the ordered sample͒.…”

Section: A Anharmonicity and Phonon Dosmentioning

confidence: 99%

“…The yield stress at room temperature for ordered Ni 3 V has been reported to be 900 MPa. 18 Our samples were loaded to only 270 MPa, and we ensured that there was no reduction in slope of the stress-strain curves at the highest loads. Several load-unload cycles were performed on each sample.…”

Section: Methodsmentioning

confidence: 99%

“…In support of this expectation, we found that the unloading curve was more reproducible than the loading curve, and we found that the Young's modulus of the ordered material was in good agreement with that of François, Hug, and Veyssière. 18 Young's moduli are presented in Table I, together with linear coefficients of thermal expansion.…”

Section: Elastic Moduli Thermal-expansion Coefficients Grü Neisementioning

confidence: 99%

“…The domains are mutually arranged in a microtwin-type microstructure to minimize the elastic energy. 17,18,21,22 Such a microstructure can be optimized to minimize elastic energy at only one temperature, however. With changes in temperature, the ordered domains expand or contract anisotropically, generating internal elastic energy owing to geometrical mismatch between the lenticular packets.…”

Section: B Microstructure and Elastic Energymentioning

confidence: 99%

“…In the present work we used differential scanning calorimetry to measure ⌬C p (T) for two states of the metallic alloy Ni 3 V. The material was quenched from high temperature to provide a state of partial disorder, which we confirmed to have strong chemical order, but none of the tetragonality of the equilibrium D0 22 structure. 17,18 The second state of the material was the D0 22 equilibrium structure, obtained by annealing the alloy.…”

Section: Introductionmentioning

confidence: 99%

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Vibrational entropy and microstructural effects on the thermodynamics of partially disordered and orderedNi3V

et al. 1997

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Samples of Ni 3 V were prepared with two microstructures: ͑1͒ with equilibrium D0 22 order, and ͑2͒ with partial disorder ͑having a large D0 22 chemical order parameter, but without the tetragonality of the unit cell͒. For both materials, we measured the difference in their heat capacities from 60 to 325 K, inelastic neutronscattering spectra at four values of Q at 11 and at 300 K, and Young's moduli and coefficients of thermal expansion. The difference in heat capacity at low temperatures was consistent with a harmonic model using the phonon density of states ͑DOS͒ curves determined from the inelastic neutron-scattering spectra. In contrast, at temperatures greater than 160 K the difference in heat capacity did not approach zero, as expected of harmonic behavior. The temperature dependence of the phonon DOS can be used to approximately account for the anharmonic contributions to the differential heat capacity. We also argue that some of the anharmonic behavior should originate with a microstructural contribution to the heat capacity involving anisotropic thermal contractions of the D0 22 structure. We estimate the difference in vibrational entropy between partially disordered and ordered Ni 3 V to be S pdis ϪS ord ϭ͑ϩ0.038Ϯ0.015͒k B /atom at 300 K. ͓S0163-1829͑96͒02945-1͔

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Section: A Anharmonicity and Phonon Dosmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Elastic Moduli Thermal-expansion Coefficients Grü Neisementioning

confidence: 99%