Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.455100
Title: The Growth of γ Precipitates from A β Matrix in Copper-Zinc and Silver-Zinc Alloy Systems.
Author: Fairs, S.
Awarding Body: University of Sussex
Current Institution: University of Sussex
Date of Award: 1978
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Abstract:
Experimental measurements have been made on the growth of dendritic y phase precipitates from aß phase matrix in the alloy systems copper/zinc and silver/zinc. These data are then applied. to the current most general theoretical model of dendrite growth (Trivedi Theory), but without making the normal assumption that the dendrite growth velocity corresponds to the maximum velocity predicted by the theory. It is found that there is doubt as to the validity of the application of such a criterion in the alloy systems, copper/zinc and silver/zinc. The fundamental interfacial instability theory of Mullins and Sekerka has been modified and applied to these two alloy systems to calculate the values of the critical radii of instability. These values are in agreement with the observed values of length and tip radii of the dendritic precipitates. A correlation has been found between the experimental measured tip radius (p exp and the critical radius for relative instability (RC) such that fexp is of the order RC of 1. This suggests that some form of stability criterion determines the tip radius of the crowing dendrite and the dendrite travels with the velocity associated with this particular tip radius. This velocity need not correspond to the predicted maximum velocity of the theory. As a result of the work presented in this thesis, the above analyses were applied to data reported in the literature for the growth of succinonitrile dendrites. Similar conclusions were reached.. The paper is included as an Appendix
Supervisor: Not available Sponsor: Not available
Qualification Name: Doctoral Thesis - University of Sussex. Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.455100  DOI: Not available
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