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|Type:||Artigo de periódico|
|Title:||Microstructural development during transient directional solidification of hypermonotectic Al-Bi alloys|
|Abstract:||Directional unsteady-state solidification experiments were performed with hypermonotectic Al-5.0 wt%Bi and 7.0 wt%Bi alloys. Thermal parameters such as the growth rate (upsilon) and the thermal gradient (G) were experimentally determined by cooling curves recorded along the casting length. The predominant Bi-rich phase was characterized by droplets embedded in the aluminum matrix. Both the interphase spacing (lambda) and the Bi-rich particles diameter (d) were measured along the casting length. These microstructural features were correlated to the solidification thermal parameters: growth rate, cooling rate and thermal gradient. An experimental law expressing). as a function of both G and upsilon was found to better represent the growth of hypermonotectic Al-Bi alloys. Moreover, it was found that the interphase spacing decreases with increasing alloy bismuth content. (C) 2010 Elsevier Ltd. All rights reserved.|
Non-ferrous metals and alloys
|Editor:||Elsevier Sci Ltd|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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