Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
International Journal for Multiscale Computational Engineering
Impact-faktor: 1.016 5-jähriger Impact-Faktor: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Druckformat: 1543-1649
ISSN Online: 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

ABSTRAKT

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:

MODELS AND EXPERIMENTS FOR RADIATION PARAMETER ESTIMATION OF ABSORBING, EMITTING AND ANISOTROPICALLY SCATTERING MEDIA
International Heat Transfer Conference 8, Vol.2, 1986, issue
A. Venet, Jean-Francois Sacadura, G. Uny
HIGH-TEMPERATURE RADIATIVE PROPERTIES OF OPEN-CELLULAR POROUS MATERIALS
International Heat Transfer Conference 11, Vol.21, 1998, issue
Koulchl Kamluto , Toshlhlro Matsushita
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
OPTICAL AND RADIATIVE PROPERTIES OF YSZ PLASMA-SPRAYED COATINGS
ICHMT DIGITAL LIBRARY ONLINE, Vol.17, 2007, issue
V. Debout, Erick Meillot, E. Bruneton, Franck Enguehard, P. Abelard, Pierre Fauchais, Armelle Vardelle
Experimental thermal characterization of semi-transparent media
International Heat Transfer Conference 12, Vol.5, 2002, issue
Denis Maillet, Myriam Lazard