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The effect of heating rate on the microstructural breakdown required for thixoformability

  • Cecília T. W. Proni und Eugênio J. Zoqui
Veröffentlicht/Copyright: 22. Februar 2017
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 108 Heft 3

Abstract

Thixoforming processes depend upon three basic features of the semisolid slurry: the thermodynamics of the liquid-to-solid transition; the morphology of the microstructure; and the slurry's rheological properties. By studying the thermodynamics of the solid-to-liquid transition of a specific alloy, one can determine whether the entire thixoforming process can be controlled when the alloy is used as the raw material. The rheology of the semisolid material is determined not only by the morphology of the microstructure of the primary solid phase immersed in the liquid, but also by the relative amounts of liquid and solid. In thixoforming operations the raw material is heated up to the semisolid state and injected into the die. Hence, the heating procedure has a significant impact on the morphology of the remaining solid and, consequently, its viscous behaviour, as shown in this paper. A heating rate close to 50 K min−1 was found to produce the most suitable morphology for semisolid processing as the mechanisms involved (Ostwald ripening and coalescence) were present to an equal extent.

Keywords: Semisolid materials; Thixoforming; Rheology; Optical microscopy; Aluminium alloys
*Correspondence address, Cecília Tereza Weishaupt Proni, PhD, Eugênio José Zoqui, Professor, Materials and Manufacturing Department, Faculty of Mechanical Engineering, University of Campinas – UNICAMP, R. Mendelev 200, Campinas, SP, 13083-860, Brazil, Tel.: +551935213296, Fax: +551935213722, E-mail: , E-mail: , Web: http://lattes.cnpq.br/5094974411402019

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Received: 2016-08-04
Accepted: 2016-12-21
Published Online: 2017-02-22
Published in Print: 2017-03-13

© 2017, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Effect of grain defects on the mechanical behavior of nickel-based single crystal superalloy
  5. Evolution of mechanical properties and microstructure of differently cryogenically treated hot die steel AISI–H13
  6. Microstructure and mechanical properties of nickel particle reinforced magnesium composite: impact of reinforcement introduction method
  7. Microstructure and mechanical properties of carbon nanotube-reinforced ZK61 magnesium alloy composites prepared by spark plasma sintering
  8. Solidification microstructures of Cu–Zr–Al–Y BMG produced by casting in a wedge-shaped copper mold
  9. Energy spectrum analysis of anodic oxidation film surface–interface on 7475 aluminum alloy after salt spray corrosion
  10. Fabrication of Ni/SiC composite powder by mechanical alloying and its effects on properties of copper matrix composites
  11. The sintering behavior and physical properties of Li2CO3-doped Bi0.5(Na0.8K0.2)0.5TiO3 lead-free ceramics
  12. The effect of heating rate on the microstructural breakdown required for thixoformability
  13. Nano-particles in powder injection molding of an aluminum matrix composite: Rheological behavior, production and properties
  14. Short Communications
  15. Preparation of vaterite CaCO3 microspheres by fast precipitation method
  16. Slag corrosion resistance of Al4SiC4
  17. DGM News
  18. DGM News
https://doi.org/10.3139/146.111472
Schlagwörter für diesen Artikel
Semisolid materials; Thixoforming; Rheology; Optical microscopy; Aluminium alloys

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Effect of grain defects on the mechanical behavior of nickel-based single crystal superalloy
  5. Evolution of mechanical properties and microstructure of differently cryogenically treated hot die steel AISI–H13
  6. Microstructure and mechanical properties of nickel particle reinforced magnesium composite: impact of reinforcement introduction method
  7. Microstructure and mechanical properties of carbon nanotube-reinforced ZK61 magnesium alloy composites prepared by spark plasma sintering
  8. Solidification microstructures of Cu–Zr–Al–Y BMG produced by casting in a wedge-shaped copper mold
  9. Energy spectrum analysis of anodic oxidation film surface–interface on 7475 aluminum alloy after salt spray corrosion
  10. Fabrication of Ni/SiC composite powder by mechanical alloying and its effects on properties of copper matrix composites
  11. The sintering behavior and physical properties of Li2CO3-doped Bi0.5(Na0.8K0.2)0.5TiO3 lead-free ceramics
  12. The effect of heating rate on the microstructural breakdown required for thixoformability
  13. Nano-particles in powder injection molding of an aluminum matrix composite: Rheological behavior, production and properties
  14. Short Communications
  15. Preparation of vaterite CaCO3 microspheres by fast precipitation method
  16. Slag corrosion resistance of Al4SiC4
  17. DGM News
  18. DGM News
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