Abstract
Acoustic emission (AE) is used in this article to study melting and solidification of embedded indium particles in the size ranging from 0.2 to 3 μm in diameter and to show that dislocation generation occurs in the aluminum matrix to accommodate a 2.5 pct volume change. The volume-averaged acoustic energy produced by indium particle melting is similar to that reported for bainite formation upon continuous cooling. A mechanism of prismatic loop generation is proposed to accommodate the volume change, and an upper limit to the geometrically necessary increase in dislocation density is calculated as 4.1 × 109 cm−2 for the Al-17In alloy. Thermomechanical processing is also used to change the size and distribution of the indium particles within the aluminum matrix. Dislocation generation with accompanied AE occurs when the melting indium particles are associated with grain boundaries or upon solidification where the solid-liquid interfaces act as free surfaces to facilitate dislocation generation. AE is not observed for indium particles that require super heating and exhibit elevated melting temperatures. The AE work corroborates previously proposed relaxation mechanisms from prior internal friction studies and that the superheat observed for melting of these micron-sized particles is a result of matrix constraint.
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Acknowledgments
This work was supported in part by the National Science Foundation, the Department of Energy, and the American Iron and Steel Institute under contract No. CMMI 0726888, and the authors are grateful to Eric Bohannan at the Missouri S&T Materials Research Center for his help with DSC.
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Manuscript submitted June 26, 2012.
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Kuba, M.M., Van Aken, D.C. Analysis of Acoustic Emission During the Melting of Embedded Indium Particles in an Aluminum Matrix: A Study of Plastic Strain Accommodation During Phase Transformation. Metall Mater Trans A 44, 3444–3455 (2013). https://doi.org/10.1007/s11661-012-1468-y
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DOI: https://doi.org/10.1007/s11661-012-1468-y