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The use of size distributions in determining growth mechanisms: the growth of grain boundary precipitates in cobalt-20 iron

Northover, Shirley M. (2014). The use of size distributions in determining growth mechanisms: the growth of grain boundary precipitates in cobalt-20 iron. Metallurgical and Materials Transactions A, 46(1) pp. 164–177.

URL: http://link.springer.com/article/10.1007/s11661-01...
DOI (Digital Object Identifier) Link: https://doi.org/10.1007/s11661-014-2565-x
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Abstract

Accurate prediction of microstructural stability in an alloy depends not only on a sound knowledge of the thermodynamics of the system but also of the kinetics of the phase changes involved. Conventionally, precipitate growth mechanisms have been inferred from the variation with aging time of various single parameters such as the mean, mode or maximum of the precipitate size distribution, which has then been compared to theoretical models of growth of an individual precipitate. In the present study, the development, with aging time at 1003 K (730 °C), of the size and shape distributions of grain boundary precipitates in Co-20Fe has been examined to determine the rate-controlling processes, and the conclusions compared to those from conventional analysis. The growth of the precipitates was well described by the grain boundary-dependent collector plate mechanism of Brailsford and Aaron. As the precipitates grew, low-energy facets were formed, which could move only by the propagation of ledges, and thickening was inhibited. The precipitates’ diffusion fields in the grain boundary overlapped and the size distributions of the longest aged specimens showed that local coarsening occurred under partial interface control.

Item Type: Journal Item
Copyright Holders: 2014 The Minerals, Metals & Materials Society and ASM International
ISSN: 1543-1940
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 41652
Depositing User: Shirley Northover
Date Deposited: 05 Jan 2015 10:52
Last Modified: 07 Dec 2018 10:27
URI: http://oro.open.ac.uk/id/eprint/41652
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