Results 211 to 220 of about 5,784 (244)

Precipitation of molybdenum carbide in steel: multicomponent diffusion and multicomponent capillary effects

Materials Science and Technology, 1999
Alloy carbides are of considerable importance in the design of steels resistant to creep deformation during service at elevated temperatures. Their formation in ternary or higher order steels involves the diffusion of both substitutional and interstitial solutes.
N. Fujita, H.K.D.H. Bhadeshia
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On the Role of Ni in Cu Precipitation in Multicomponent Steels

Metallurgical and Materials Transactions A, 2013
The nature of Cu precipitation in quench-tempered multicomponent high-strength low-alloy steels is characterized by atom probe tomography. The detected nanometer sized Ni-rich clusters act as preferential nucleation sites for Cu-rich clusters, and Ni segregation at the Cu-rich precipitate/matrix heterophase interface contribute to fast growth of Cu ...
Qingdong Liu, Jianfeng Gu, Wenqing Liu
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Anomalous precipitate-size-dependent ductility in multicomponent high-entropy alloys with dense nanoscale precipitates

Acta Materialia, 2022
Abstract Precipitates are known to be effective obstacles for dislocation gliding, which can substantially increase the strength of metallic materials. In particular, dense nanoscale precipitates under a peak-aged condition can achieve a favorable precipitate size for pronounced strengthening, which, however, often causes progressive stress ...
Y.L. Zhao, Y.R. Li, G.M. Yeli, J.H. Luan, S.F. Liu, W.T. Lin, D. Chen, X.J. Liu, J.J. Kai, C.T. Liu, T. Yang   +10 more
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Model for coarsening of intergranular precipitates in multicomponent systems

Scripta Materialia, 2010
Based on the thermodynamic extremal principle, a model for coarsening of intergranular precipitates in multicomponent systems is developed. The model provides the evolution equations for individual precipitates within the mean-field approach and generalizes the recent models applicable only to a special binary system. Simulations based on the model are
J. Svoboda, F.D. Fischer
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Theory of the nucleation of multicomponent precipitates

Physical Review B, 1983
The nucleation kinetics of multicomponent precipitates is studied. For this, asymptotic solutions of the corresponding stationary Fokker-Planck equation are derived and analyzed. The nucleation flux in composition space ${\stackrel{\ensuremath{\rightarrow}}{\mathrm{n}}}$ is determined by the reaction rates $R$ of the constituent components (kinetic ...
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A model for evolution of shape changing precipitates in multicomponent systems

Acta Materialia, 2008
Recently the authors introduced a concept of shape factors to extend an already established model for the growth and coarsening kinetics of spherical precipitates in multicomponent multiphase environments to needle- and disc-shaped geometries. The geometry of the precipitates is kept in the original version of the concept to be self-similar with a ...
J. Svoboda, F.D. Fischer, P.H. Mayrhofer
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Solute distribution around a coherent precipitate in a multicomponent alloy

Metallurgical Transactions A, 1991
The open system elastic constants for a multicomponent alloy are derived and used to determine the equilibrium solute concentration profile surrounding an isolated coherent M2C carbide precipitate with a transformation strain with three unequal eigenstrains in an elastically anisotropic AF1410 steel.
K. C. King, P. W. Voorhees, G. B. Olson, T. Mura   +3 more
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Multicomponent Solute Transport with Moving Precipitation/Dissolution Boundaries

1988
Publisher Summary This chapter discusses multicomponent solute transport with moving precipitation/dissolution boundaries. Multicomponent solute transport problems involving precipitation and dissolution chemical reactions are unique among the wide array of problems encountered in which homogeneous and heterogeneous reactions affect the movement of ...
J.A. Mundell, D.J. Kirkner
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Strategies for strengthening-ductility and hierarchical co-precipitation in multicomponent nano-precipitated steels by Cu partitioning

Materials Science and Engineering: A, 2019
Abstract We investigated the dependence of both the strength and ductility in Cu-bearing nano-precipitated steels on compositions, tempering and aging, where Fe-2Cu (wt%, Cu-steel) steel by Cu-rich precipitates (CRPs), Fe-2Cu-5Ni-3Mn-1.5Al steel (Cu/Ni steel) by co-precipitates of CRPs+NiAl, and Fe-2Cu-5Ni-3Mn-1.5Al-1Mo (Mo-steel) steel by co ...
Jiacheng Yan, Hongwei Xu, Xiaowei Zuo, Tao Jia, Engang Wang   +4 more
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Analytical treatment of diffusion during precipitate growth in multicomponent systems

Acta Materialia, 2008
We propose an approximate growth rate equation that takes into account both cross-diffusion and high supersaturations for modeling precipitation in multicomponent systems.
Qing Chen, Johan Jeppsson, John Ågren
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