Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-43733
Rappaz, M; Kohler, F; Valloton, J; Phillion, A.B; Stampanoni, M (2010). Connectivity of phases and growth mechanisms in peritectic alloys solidified at low speed: an X-ray tomography study of Cu-Sn. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 41(3):563-567.
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The variety of microstructures that form at low solidification speed in peritectic alloys, bands, and islands, or even coupled (or cooperative) growth of the primary α and peritectic β phases, have been previously explained by nucleation-growth mechanisms. In a recent investigation on Cu-Sn, a new growth mechanism was conjectured on the basis of two-dimensional (2-D) optical microscopy and electron backscattered diffraction (EBSD) observations made in longitudinal sections. In the present contribution, synchrotron-based tomographic microscopy has been used to confirm this mechanism: α and β phases totally interconnected in three dimensions and bands (or islands) can result from an overlay mechanism, rather than from a nucleation events sequence. When the lateral growth of a new layer is too fast, an instability can lead to the formation of a lamellar structure as for eutectic alloys.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > Institute of Biomedical Engineering|
610 Medicine & health
|Deposited On:||30 Jan 2011 21:22|
|Last Modified:||27 Nov 2013 21:57|
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