ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
The analysis of physicochemical mechanism of the influence of mechanical activation(MA) of a charge mixture on the subsequent self-propagating high-temperature synthesis (SHS) ofintermetallic compounds is performed. Numerical estimates have revealed an insignificant role ofthe energy stored in solid reactants due to cold work during MA. The characteristic time ofrelaxation of non-equilibrium vacancies, which were generated in metals by MA, during heating inthe SHS wave is estimated, and their insignificant influence on the reaction kinetics at hightemperatures is demonstrated. It is shown that a strong effect of preliminary MA on SHS can beattributed only to deformation-enhanced solid-state diffusion during MA, which can lead to theformation of a supersaturated solid solution and thus affect the conditions for nucleation of aproduct phase (intermetallic compound) upon heating
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.138.159.pdf