Mathematical Modeling of Combustion-Type Interaction During Mechanical Alloying

  • B. B. Khina
  • Yu. S. Sholpan

Abstract

Mechanical alloying (MA) has received considerable attention from materials scientists not only as a versatile method for producing materials with unique properties (nanocrystalline alloys, supersaturated solid solutions, amorphous phases, etc.) but also due to the unusual phase and structure formation mechanisms involved.1–5 In a number of systems with large negative enthalpy of mixing, combustion-type interaction has been observed during MA.6–17 This phenomena was named “combustion synthesis by mechanical alloying” (CSMA):6 after an incipient period (plastic deformation/welding of particles, grain size refinement and increase of the contact area), the conversion of reactants into a final product occurs in a short time as a self-sustaining exothermic reaction. The instant of “ignition” is marked by a sharp temperature increase registered by a thermocouple attached to the outer surface of the vial. In most of the systems where CSMA was observed (CuO-M (M=Ca, Al, Ti, Fe, Mg),6–10 Ni-Al,11,12 Mo-Si,13 Ti-Ni,14 Ti-C-Ni,15 Fe3O4-Al,16 Sn-Zn-S,17 and others) there was no noticeable product formation before the temperature peak, and almost complete conversion to the final product in a short time after it. Characterization of the particles immediately after the exothermic peak suggested that the interaction mechanism involved melting of one or both of the reactants and solidification of the product from the melt.6–8, 12–16

Keywords

Combustion Titanium Porosity Carbide Welding 

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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • B. B. Khina
    • 1
  • Yu. S. Sholpan
    • 2
  1. 1.Physicotechnical InstituteNational Academy of SciencesMinskBelarus
  2. 2.Polytechnic InstituteChishinauMoldova

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