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Liquid segregation behavior of semi-solid AZ91 alloy during back extrusion test

Khosravani, A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jallcom.2008.10.149
  3. Publisher: 2009
  4. Abstract:
  5. The present work is focused on the segregation behavior of semi-solid AZ91 magnesium alloy with Ca content. For this purpose a simple back extrusion test was used and the semi-solid billet was fabricated through a cooling slope. Different shear rates were obtained by variation in ram speed and extrusion ratio. Microstructures of the extruded samples were investigated and liquid segregation was described by Darcy's law. Homogeneity was improved by using higher shear rates, produced either by increasing plunger velocity or extrusion ratio, while at very high shear rates the air was entrapped inside the wall of the extruded sample. © 2008 Elsevier B.V. All rights reserved
  6. Keywords:
  7. AZ91 ; Az91 alloys ; Az91 magnesium alloys ; Back extrusion ; Cooling slopes ; Darcy's laws ; Extrusion ratios ; High shear rates ; Liquid segregation ; Ram speed ; Semi solids ; Semi-solid billets ; Shear rates ; Thixoforming ; Calcium ; Fluid dynamics ; Liquids ; Magnesium ; Magnesium alloys ; Segregation (metallography) ; Shear deformation ; Shear flow ; Extrusion
  8. Source: Journal of Alloys and Compounds ; Volume 477, Issue 1-2 , 2009 , Pages 822-827 ; 09258388 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0925838808019798