Results 271 to 280 of about 14,324 (302)
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On the theory of loss of coherency by spherical precipitates
Philosophical Magazine, 1969Abstract Abstract An expression is derived for the equilibrium misfit of a spherical precipitate as a function of precipitate size. An expression is given for the critical precipitate radius beyond which it is energetically favourable for loss of coherency to occur. The effect of an externally applied stress on the above expressions is also considered.
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Critical sizes for coherent to semicoherent transition in precipitates
International Journal of Materials Research, 2013Abstract A coherent precipitate, on growth beyond a critical size, can become semicoherent through the formation of interfacial misfit dislocations. This investigation pertains to the finite element simulation of the state of stress of a coherent precipitate, its growth and the change in state of stress on the formation of an interfacial
Arun Kumar +2 more
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Coherent Precipitate Strengthening Mechanisms in MgO
1975MgO containing magnesia ferrite particles is a model system for the study of the interaction between dislocations and second phase particles in ceramic materials. Therefore, several investigations have been performed on two-phase MgO under this aspect [1–7]. Magnesia ferrite crystalizes as inverse spinel with disorder [18].
B. Reppich, H. Knoch
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An Estimate of the Precipitation Hardening by Coherent Particles
physica status solidi (a), 1982The hardening of f.c.c. metal by a dispersion of coherent spherical precipitate particles and tetragonally distorted precipitate particles such as ellipsoidal or disc-shaped particles lying on {100} is analysed by using anisotropic elasticity theory. The misfit strains for tetragonally distorted particles are such that the principal axes of strain are ...
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Preferential growth of coherent precipitates at grain boundary
Materials Letters, 2020Abstract Coherent precipitates are known to be more effective than their incoherent counterparts in pinning grain boundaries and impact the properties of alloys. In the present work, we showed the location preference of coherent M23C6 and NiAl precipitates formed at the grain boundaries in an Al-containing austenitic steel.
Hongyuan Wen +4 more
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A new theory of the homogeneous nucleation of a coherent precipitate
Philosophical Magazine A, 1983Abstract The change in free energy of a system brought about by the precipitation of a coherent solute-rich phase from regular solution is evaluated using the statistical thermodynamic approach. A comparison of the enthalpy and entropy contributions revealed that the change in free energy accompanying nucleation arises not from the increase in the ...
Taichi Kamijo, Hiroshi Fukutomi
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On the interaction between radiation damage and coherent precipitates
Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1971Abstract The experiments of Brown, Woolhouse & Valdrè (1968) on coherency loss induced by fast neutron irradiation have been extended by varying the precipitate size distribution, the fast neutron dose and the mismatch of the precipitate. When the integrated dose and the mean precipitate size are large, coherency loss is extensive
G. R. Woolhouse, M Ipohorski
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Coherent predictand areas for spatially coherent precipitation downscaling
2013Statistical downscaling aims at finding relationships between local precipitation (predictand) and large-scale predictor fields, in various contexts, from medium-term forecasting to climate change impact studies. For distributed hydrological modelling the downscaled precipitation spatial fields have furthermore to be coherent over possibly large river ...
Radanovics, S. +4 more
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On the coherency-controlled growth habit of precipitates in minerals
Journal of Applied Crystallography, 2010Minimization of interfacial energy is the dominant factor governing the equilibrium habit,i.e.orientation and morphology, of a precipitate in the parent crystal. Existing models of optimum interphase boundaries have established criteria that minimize the lattice misfit and/or the strain energy by the comparison of the interplanar spacings of the two ...
Shyh-Lung Hwang +3 more
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Growth of a coherent precipitate from a supersaturated solution
Journal of Materials Research, 1988A treatment of diffusion limited growth of a coherent spherical precipitate into supersaturated solution is presented. It is found that the growth kinetics are affected by dilatational coherency strains and by compositionally induced strains in the matrix phase.
V. J. Laraia +2 more
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