Ferroelasticity of Niobium due to Hydrogen as a Lattice Gas

Alefeld, G.; Schaumann, Gabriele E.; Tretkowski, J.; Völkl, J.

doi:10.1103/physrevlett.22.697

Cited by 37 publications

(5 citation statements)

References 9 publications

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“…The dipole force tensor is the connecting quantity between the atomistic and the elastic-continuum description of lattice distortions originating from point defects in crystals. 8 The dipole force tensor is analogous to an electric or magnetic dipole and has been used for instance in the description of ferroelasticity 9 .…”

Section: Introductionmentioning

confidence: 99%

Hydrogen site occupancy and strength of forces in nanosized metal hydrides

et al. 2012

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The dipole force components in nano-sized metal hydrides are quantitatively determined with curvature and x-ray diffraction measurements. Ab-initio density functional theory is used to calculate the dipole components and the symmetry of the strain field. The hydrogen occupancy in a 100 nm thick V film is shown to be tetrahedral with a slight asymmetry at low concentration and a transition to octahedral occupancy is shown to take place at around 0.07 [H/V] at 360 K. When the thickness of the V layer is reduced to 3 nm and biaxially strained, in a Fe0.5V0.5/V superlattice, the hydrogen unequivocally occupies octahedral z-like sites, even at and below concentrations of 0.02 [H/V].

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Section: Introductionmentioning

confidence: 99%

Hydrogen site occupancy and strength of forces in nanosized metal hydrides

et al. 2012

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“…It is, therefore, surprising that central predictions of the theory have not seen direct verification by experiment. The closest were experiments on the elastic aftereffect in metal hydrides around 1970 ( 19 , 20 ). That effect was first analyzed in pioneering theory by Vadim Gorsky, who predicted an elastic relaxation as solute is redistributed in stress gradients in a solid solution ( 21 , 22 ).…”

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confidence: 99%

Verifying Larché–Cahn elasticity, a milestone of 20th-century thermodynamics

Shi

Markmann

Weißmüller

2018

Proc. Natl. Acad. Sci. U.S.A.

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SignificanceBy concatenating the fields of continuum mechanics and alloy thermodynamics in a unified framework, the theory of open system elasticity by Francis Larché and John W. Cahn achieved one of the key advances in thermodynamics of the 20th century. The theory’s implications for the coupling between stress and composition are generally well acknowledged, yet selected issues are under debate. It is, therefore, dissatisfactory that the predictions for the open system elastic parameters—as the theory’s central materials descriptors—await experimental verification. Here, we report that the variation of the open system Young’s modulus of palladium hydride with composition is in excellent agreement with the prediction. This confirms a cornerstone of materials’ theory.

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“…Several studies have reported an enhanced elastic compliance of bulk metal hydrides when alloyed with hydrogen [62][63][64][65][66] , and observations of the elastic aftereffect in cantilevers or foils have been discussed as the consequence of hydrogen relocation in stress gradients [2,15,67] . Yet, the only quantitative verification of the Larché-Cahn theory of open system elasticity has been based on experiments with nanoporous metal made by dealloying [14] .…”

Section: Relation Between Global Uniaxial Deformation Of Network and ...mentioning

confidence: 99%

“…Experimental investigations of the Gorsky effect observe the elastic response on two separate timescales: jumps in the external load on a macroscopic body entail the immediate elastic response at constant composition, followed by the much slower (time constants ∼ 1 h for mm-size bodies [15,16] ) strain of the "elastic aftereffect". Diffusion constants of the mobile solute species may be inferred from the time-dependence of the slower process.…”

Section: Introductionmentioning

confidence: 99%