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Microstructural evolution of aluminium–copper alloys during the downward directional solidification process

  • Fu Wang , Dexin Ma , Jun Zhang , Lin Liu , Jianping Hong , Samuel Bogner and Andreas Bührig-Polaczek
Published/Copyright: February 7, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 105 Issue 2

Abstract

The microstructural evolution of Al–Cu alloys during the downward directional solidification process was investigated. At the planar-to-cellular transformation point, the planar liquid/solid (L/S) interface broke down at the centre. This was contrasted with the behaviour in the liquid metal cooling process, where the interface broke down at the periphery. The critical withdrawal rate at this point was higher than the theoretical value. In addition to this, the variation in the primary dendrite arm spacing (λ1) as a function of the withdrawal rate (V) at constant GL for the Al-2.0 wt.% Cu alloy agreed with the conventional processes. The comparison of λ1 in our experiment to the calculated value λ1 using the Kurz–Fisher, Ma and Trivedi models showed that λ1, calculated by these models, overvalued our experimental results. However, the λ1 calculated from the Hunt model agreed well with the experimental values of λ1. When we reduced the diameter of the sample from 13 mm to 9 mm and maintained the other parameters constant, the L/S interface retained a planar shape. This indicated that the L/S interface was more stable in the smaller sample than that in the larger. This result contrasted with the result in the liquid metal cooling process.

Keywords: Directional solidification; Convection; Dendrites; Morphological stability; Interfaces
* Correspondence address, PD Dr. Dexin Ma, Giesserei-Intitute, RWTH Aachen, Intzestr. 5, D-52072 Aachen, Germany, Tel.: +492418095883, Fax: +492418092276, E-mail:

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Received: 2013-06-13
Accepted: 2013-08-12
Published Online: 2014-02-07
Published in Print: 2014-02-10

© 2014, Carl Hanser Verlag, München

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  2. Contents
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  4. Experimental determination of a representative texture and insight into the range of significant neighboring grain interactions via orientation and misorientation statistics
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  6. Nanoindentation responses of Si–Ge multilayers
  7. Microstructural and thermodynamic investigations on friction stir welded Mg/Al-joints
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  9. Microstructural evolution of aluminium–copper alloys during the downward directional solidification process
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  16. Short Communications
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  18. DGM News
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https://doi.org/10.3139/146.111005
Keywords for this article
Directional solidification; Convection; Dendrites; Morphological stability; Interfaces

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Experimental determination of a representative texture and insight into the range of significant neighboring grain interactions via orientation and misorientation statistics
  5. Methods of segregation analysis applied to simulated multicomponent multiphase microstructures
  6. Nanoindentation responses of Si–Ge multilayers
  7. Microstructural and thermodynamic investigations on friction stir welded Mg/Al-joints
  8. Ingot metallurgy and microstructural characterization of Ti–Ta alloys
  9. Microstructural evolution of aluminium–copper alloys during the downward directional solidification process
  10. Indium ion cementation onto aluminum plates in hydrochloric acid solutions: a kinetic perspective
  11. Development of Sn–Cu–Sb alloys for making lead- and bismuth-free pewter
  12. The effect of Sn addition and sulfide ion concentration on the corrosion behavior of Cu-35Zn in NaCl solution
  13. Synthesis and characteristics of precipitation hardened Cu–Cr alloy and multiply hardened Cu–Cr–Al2O3 nanocomposite obtained using powder metallurgy techniques
  14. Effect of rhenium addition on the strengthening of chromium–alumina composite materials
  15. Grain growth and sinterability in Er2O3-doped cubic zirconia (c-ZrO2)
  16. Short Communications
  17. Properties of aluminium coatings produced using manual and robotized flame spraying processes
  18. DGM News
  19. DGM News
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