On the Effect of Matrix Relaxation during the Melting of Embedded Indium Particles

Abstract

The melting transformation of micron-sized (1-20 pm in diameter) indium particles embedded in an aluminium matrix has been studied using differential scanning calorimetry. An average elevation in the melting-temperature of 4°C was observed for particles embedded in the grain interiors, whereas particles situated at high-angle boundaries melted at the equilibrium temperature. The relative contributions from interfacial surface energy and strain energies resulting from thermal expansion mismatch and a volume change upon transformation to the melting-temperature were calculated. It was shown that the volume transformation stress upon melting was the major factor in causing the melting-temperature elevation. The difference between the melting behaviour of the embedded and the grain-boundary inclusions was related to differences in the rate of stress relaxation associated with the formation of the liquid nuclei. Volume changes at the grain-boundaries were rapidly accommodated by diffusional processes, whereas the matrix behaved in a rigid manner with respect to particles embedded in the grain interiors. © 1995 Taylor & Francis Group, LLC.

Department(s)

Materials Science and Engineering

Comments

Office of Naval Research, Grant 94-5-1 894

International Standard Serial Number (ISSN)

0141-8610

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Taylor and Francis Group; Taylor and Francis, All rights reserved.

Publication Date

01 Jan 1995

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