Abstract
The sintering kinetics is investigated and the activation energy of sintering of milled powders of iron and mechanically alloyed mixture “iron-0.5% carbon-5.6% ferrophosphorus” is calculated. The dislocation density increasing to 1011 cm−2 is calculated by X-ray phase analysis and metallography, and ordering of dislocations in milled powders of iron and mechanically alloyed mixture upon increasing the milling time is found. Based on the values of porosity, which vary during isothermal sintering at 900–1100°C in powders milled in different times, coefficients of the Ivensen equation and activation energy of sintering and concentration of structural defects, which are present in the beginning of isothermal sintering, are calculated. The results of investigations showed that the formation upon milling the dislocation structure with a high density of thermally unstable dislocations slightly activates sintering, and structural defects formed during the formation of solid solutions during mechanical alloying and heterodiffusion affect the activation of sintering much more strongly.
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Original Russian Text © S.A. Oglezneva, M.N. Portalov, 2014, published in Izvestiya VUZ. Poroshkovaya Metallurgiya, 2014, No. 1, pp. 9–16.
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Oglezneva, S.A., Portalov, M.N. Investigation into the kinetics of isothermal sintering of milled and mechanically alloyed iron powders. Russ. J. Non-ferrous Metals 56, 300–306 (2015). https://doi.org/10.3103/S1067821215030153
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DOI: https://doi.org/10.3103/S1067821215030153