Elastic moduli of polycrystalline ZrCo as a function of temperature

Agosta, D.S.; Hightower, Joseph E.; Foster, K.; Leisure, R. G.; Gavra, Z.

doi:10.1016/s0925-8388(02)00485-1

Cited by 26 publications

(21 citation statements)

References 38 publications

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“…The values used as inputs in this study are listed in Table II. It is noted that there is considerable variability in the reported elastic constants, [19,[34][35][36] including those predicted by ab-initio modeling. [37] The extended Voce strain-hardening rule incorporated into EPSC defines the evolution of the critically resolved shear strengths (CRSSs) of individual slip systems: Table II.…”

Section: Epsc Modelingmentioning

confidence: 99%

“…[37] The extended Voce strain-hardening rule incorporated into EPSC defines the evolution of the critically resolved shear strengths (CRSSs) of individual slip systems: Table II. Single-Crystal Elastic Parameters and Anisotropy Factors for CoTi [35] and CoZr [34] Intermetallic Alloy where s is the instantaneous CRSS of the sth slip system; s 0 and s 0 + s 1 are the initial and back-extrapolated CRSS, respectively; h 0 and h 1 are the initial and final asymptotic hardening rates, respectively; and C is the accumulated plastic shear in the grain. In the present case, a simplified linear hardening rule was employed for all but one case mentioned later and is defined as…”

Section: Epsc Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Mechanisms of Ductility in CoTi and CoZr B2 Intermetallics

Wollmershauser

Neil

Agnew

2009

Metall Mater Trans A

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Section: Epsc Modelingmentioning

confidence: 99%

Section: Epsc Modelingmentioning

confidence: 99%

Mechanisms of Ductility in CoTi and CoZr B2 Intermetallics

Wollmershauser

Neil

Agnew

2009

Metall Mater Trans A

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“…4, respectively. For ZrCo, the force constant  has been obtained by using the experimental values [19]  = 7.6 g cm than that of ZrCo. Likewise the amorphous metals, alloys also exhibit oscillations in  L but no substantial oscillations in  T after the first peak.…”

Section: 1mentioning

confidence: 99%

Elastic Moduli and Phonon Dispersion Curves for Amorphous Metals and Alloys

Singh¹,

Ali²

2013

IJAPM

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Abstract-Changes in elastic constants on amorphasization are obtained from the corresponding cubic crystal values following a theoretical scheme based on equations of motion of deformation and dispersion relations. The long wavelength limit of the dispersion relations for an amorphous system enables to connect the bulk moduli to force constants. Bulk, shear and Young moduli and Poisson ratio are obtained for amorphous Ag, Al, Au, Cr, Cu, Fe, Ge, Ir, K, Li, Mo, Na, Nb, Ni, Pb, Pd, Pt, Si, Ta, Th, V and W. We also make a connection of elastic properties to thermal properties through Debye theory. Finally, we present phonon dispersion curves computed for selected amorphous metals (Si, Pb, Ni, Al, Au, Th and Fe) and amorphous alloys (ZrCo and Zr67Ni33).Index Terms-Amorphous metals, amorphous alloys, elastic constants, phonon dispersion.

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“…Since the samples were tested in a highly annealed condition, since cubic crystals have no anisotropy in the coefficient of thermal expansion, and since the elastic parameters of CoZr are isotropic (A = 1 [32] ), it is reasonable to assume that there is very little intergranular stress inherited from previous processing. Figures 5 and 6 show the internal elastic strains observed during the five cyclic loads and unloads at room temperature and 423 K (150°C), respectively.…”

Section: B Neutron Diffraction and Internal Strainsmentioning

confidence: 99%

“…The single-crystal constants used in the model [32] are shown in Table II. The EPSC model has been used to identify the operative slip systems of a variety of materials, ranging from hexagonal-close-packed Mg and Be alloys [33,34] to B2 compounds NiAl, CuZn, and CeAg.…”

Section: Epsc Modelingmentioning

confidence: 99%

In-Situ Neutron Diffraction Study of the Bauschinger Effect in B2 Structured CoZr

Mulay

Clausen

Agnew

2010

Metall Mater Trans A

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A combination of in-situ neutron diffraction and elastoplastic self-consistent (EPSC) modeling have been used to elucidate the role played by intergranular stresses in the Bauschinger effect in B2 structured CoZr at room temperature and 423 K (150°C). It is shown that, when insufficient slip modes are present to accommodate arbitrary strains, the large intergranular stresses built up due to inhomogeneous plastic deformation are responsible for the observed Bauschinger effect. Upon the onset of secondary deformation mechanism(s), the stresses are more uniformly distributed among the grains and the influence of intergranular stresses on the Bauschinger effect diminishes. On the other hand, it is speculated that the contribution of intragranular (dislocation-based) stresses is responsible for the persistent Bauschinger effect past the transition point. Similar results are obtained at both room temperature and 423 K (150°C), and while the yield strength decreases with temperature, the high-temperature stress-strain curve progressively becomes harder than the room temperature one. In light of this, the previously characterized yield strength anomaly in CoZr has been re-examined.

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Elastic moduli of polycrystalline ZrCo as a function of temperature

Cited by 26 publications

References 38 publications

Mechanisms of Ductility in CoTi and CoZr B2 Intermetallics

Mechanisms of Ductility in CoTi and CoZr B2 Intermetallics

Elastic Moduli and Phonon Dispersion Curves for Amorphous Metals and Alloys

In-Situ Neutron Diffraction Study of the Bauschinger Effect in B2 Structured CoZr

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