Continuous Twin Screw Rheo-Extrusion of an AZ91D Magnesium Alloy View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2012-07-19

AUTHORS

M. Xia, Y. Huang, Z. Cassinath, Z. Fan

ABSTRACT

The twin screw rheo-extrusion (TSRE) is designed to take advantage of the nondendritc microstructure and thixotropic characterization of semisolid-metal slurries and produce simple metal profiles directly from melts. The extrusion equipment consists of a rotor-stator high shear slurry maker, a twin screw extruder, and a die assembly. The process is continuous and has a potential for significantly saving energy, manufacturing cost, and enhancing efficiency. The present investigation was carried out to study the process performance for processing rods of an AZ91D magnesium alloy and the microstructure evolution during processing. The semisolid slurry prepared by the process was characterized by uniformly distributed nondendritic granular primary phase particles. AZ91D rods with uniform and fine microstructures and moderate mechanical properties were produced. For the given slurry making parameters, decreasing extrusion temperature was found to improve microstructures and properties. The mechanisms of particle granulation and refinement and the effect of processing parameters on process performance and thermal management are discussed. More... »

PAGES

4331-4344

References to SciGraph publications

  • 1985-12. The structure of stircast Al-6Cu in JOURNAL OF MATERIALS SCIENCE
  • 1972-07. Rheological behavior of Sn-15 pct Pb in the crystallization range in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1991-05. Behavior of metal alloys in the semisolid state in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1986-02. On the formation of the stircast structure in JOURNAL OF MATERIALS SCIENCE
  • 2000-11. Evaluation of volume fraction of solid in alloys formed by semisolid processing in JOURNAL OF MATERIALS SCIENCE
  • 2002-11. Solidification behavior of Sn-15 wt pct Pb alloy under a high shear rate and high intensity of turbulence during semisolid processing in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s11661-012-1201-x

    DOI

    http://dx.doi.org/10.1007/s11661-012-1201-x

    DIMENSIONS

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