Suscripción a Biblioteca: Guest
Portal Digitalde Biblioteca Digital eLibros Revistas Referencias y Libros de Ponencias Colecciones
International Journal for Multiscale Computational Engineering
Factor de Impacto: 1.016 Factor de Impacto de 5 años: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimir: 1543-1649
ISSN En Línea: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2017020289
pages 343-358

ESTIMATION OF MICROMECHANICAL NiAl SINTERING MODEL PARAMETERS FROM THE MOLECULAR SIMULATIONS

Marcin Maździarz
Department of Computational Science, Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5B, 02-106 Warsaw, Poland
Jerzy Rojek
Department of Computational Science, Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5B, 02-106 Warsaw, Poland
Szymon Nosewicz
Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5B, 02-106 Warsaw, Poland

SINOPSIS

Molecular statics/dynamics estimation of constitutive parameters for a micromechanical NiAl sintering model is reported in this paper. The parameters include temperature-dependent diffusion coefficients, surface energy, and linear thermal expansion. These parameters define material behavior during sintering and are used in the sintering particle model implemented in the discrete element model. The investigated material, the NiAl intermetallic, belongs to novel materials characterized by advantageous mechanical properties. Various machine elements are manufactured from a pure NiAl powder or from powder mixtures containing the NiAl using the sintering technology. It is well known that sintering is governed by diffusion. Therefore diffusive properties are important parameters of the micromechanical model of sintering. Numerical estimation of the model parameters by simulations at the lower scale is a powerful tool alternative to experimental methods. Molecular statics and dynamics models for NiAl have been created using the embedded atom model potential. Numerical simulations have allowed us to estimate the volume, surface, and grain-boundary diffusivity for the B2-type NiAl in the 1573 to 1673 K temperature range. Dependence of the diffusion coefficients on temperature has been determined and validity of the Arrhenius-type temperature dependency has been assessed. The parameters evaluated numerically have been compared with available experimental data as well as with theoretical predictions obtained with other methods. Many of the results presented in this paper have a pioneer character and are not known in the literature.


Articles with similar content:

EFFECTIVE THERMOELASTIC PROPERTIES OF POLYSILOXANE MATRIX-BASED PLAIN WEAVE TEXTILE COMPOSITES
International Journal for Multiscale Computational Engineering, Vol.13, 2015, issue 3
Michal Sejnoha, Jan Vorel, Edith Grippon
MICRO-MACRO RELATIONSHIPS FROM DISCRETE ELEMENT SIMULATIONS OF SINTERING
International Journal for Multiscale Computational Engineering, Vol.15, 2017, issue 4
Marcin Chmielewski, Szymon Nosewicz, Jerzy Rojek
Application of a Dewatering Model for Fibroporous Media under Constrained Uniaxial Compression
Journal of Porous Media, Vol.8, 2005, issue 5
Jeffrey G. Lounghran, Mei Duan
PHOTOACOUSTIC DETERMINATION OF THERMAL CONDUCTIVITY OF ALUMINUM NANOPOWDERS
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.11, 2007, issue 4
Vladimir An, Charles de Izarra
Anisotropic Micromechanical Creep Damage Model for Composite Materials: A Reduced-Order Approach
International Journal for Multiscale Computational Engineering, Vol.6, 2008, issue 2
Erez Gal, Jacob Fish