Record number :
1201704
Title of article :
Sintering kinetics study of mechanically alloyed nanocrystalline Mo–30 wt.% W
Author/Authors :
Bhaskar Paul، نويسنده , , Dheeraj Jain، نويسنده , , S.P Chakraborty، نويسنده , , I.G. Sharma، نويسنده , , C.G.S. Pillai *، نويسنده , , A.K. Suri، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2011
Pages :
8
From page :
134
To page :
141
Abstract :
The paper details the results of sintering kinetics studies conducted on nanocrystalline Mo–30 wt.% W alloy powders prepared through mechanical alloying route. Both, constant rate of heating method as well as Stepwise Isothermal Dilatometry (SID) technique were used for studying the sintering kinetics. Measured step isothermal shrinkage data were analyzed by Mekipritti-Meng method. The shrinkage data was found to fit well with the rate equation proposed in this method and its validity was established for mechanically alloyed systems. Kinetic parameters were evaluated and sintering was found to occur through two major mechanisms operative successively, which are grain boundary diffusion and lattice diffusion with corresponding energies of activation as 230 kJ/mol and 480 kJ/mol, respectively. The results have been well supported by micro structural evaluation of specimens at different stages of sintering.
Keywords :
Activation energy , Sintering , kinetics , Nanocrystalline , TMA
Journal title :
Thermochimica Acta
Serial Year :
2011
Link To Document :
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