Abstract
The growth kinetics of the discontinuous coarsening reactions in the PbCd and the ZnCd lamellar eutectic alloys have been studied at temperatures ranging from 353 to 489 K by scanning and transmission electron microscopy. In the PbCd system discontinuous coarsening were observed at all ageing temperatures whereas in the ZnCd system it was only observed between 396 and 433 K. The lamellar spacing of the discontinuous cells in the PbCd system were found to increase with increasing temperature, pass through a maximum and then decrease. The kinetics of the reaction are compared with the existing data. The analysis of the growth kinetics suggests that the reaction is controlled by grain boundary diffusion. The reported data on discontinuous coarsening are analysed by using Livingston and Cahn's [ Acta metall. 22, 495 (1974)] and Fournelle's [ Acta metall. 27, 1147 (1979)] models. The applicability of the models to different systems is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
