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https://hdl.handle.net/2440/68854
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Type: | Journal article |
Title: | Microstructural characterization of rheo-cast billets prepared by variant pouring temperatures |
Author: | Lashkari, O. Ghomashchi, R. Nafisi, S. |
Citation: | Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 2006; 441(1-2):49-59 |
Publisher: | Elsevier Science SA |
Issue Date: | 2006 |
ISSN: | 0921-5093 1873-4936 |
Statement of Responsibility: | Omid Lashkari, Shahrooz Nafisi and Reza Ghomashchi |
Abstract: | The current article reports on the effect of pouring temperature on the morphology of primary α-Al particles and the rheological behaviour of the resulting microstructures for semi-solid Al-Si 356 alloy. Attempts have been made to explain the solidification mechanism of the primary α-Al particles in the as-cast semi-solid billets and to establish a correlation between the morphology of α-Al phase and viscosity of the billets, by employing quantitative metallography and parallel plate compression viscometry tests. The results have shown that the dendritic primary α-Al structures formed at the highest pouring temperatures of 675-695 °C used in this study, have the greatest viscosity numbers. They are almost two orders of magnitude greater than those for rosette structure formed at moderate pouring temperatures of 630-645 °C. The viscosity of the dendritic primary α-Al structures is three orders of magnitude greater than those for globular morphology formed at the lowest pouring temperature of 615 °C. © 2006 Elsevier B.V. All rights reserved. |
Keywords: | Semi-solid metal Pouring temperature Microstructure Rheology Viscosity |
Rights: | © 2006 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.msea.2006.05.075 |
Description (link): | http://www.sciencedirect.com/science/journal/09215093 |
Published version: | http://dx.doi.org/10.1016/j.msea.2006.05.075 |
Appears in Collections: | Aurora harvest Materials Research Group publications Mechanical Engineering publications |
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