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Evolution of the temperature, microstructures and microsegregation in equiaxed solidification of Al-5 wt.% Cu alloy

  • Xiaoping Ma and Dianzhong Li
Published/Copyright: May 4, 2017
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 108 Issue 5

Abstract

In this study, the evolutions of the microstructures and microsegregation are related to the cooling curve in equiaxed dendritic solidification of the Al-5 wt.% Cu alloy. In addition to regular branching of dendritic arms, leaf venation branching, free branching and radial branching were also observed. With the extension of the dendritic zone, both the composition of the extra-dendritic melt and average composition of the dendritic zone change. The microsegregation mechanism in the dendritic zone deviates from the modified Scheil model. The microsegregation data suggest that the single dendritic arm is a porous structure containing the trapped boundary layer. As the temperature decreased after the isothermal periods, some original dendritic arms and interdendritic melt converged to form a new dendritic arm.

Keywords: Solidification; Microstructures; Microsegregation; Enriched boundary layer; Discrete crystal growth
*Correspondence address, Xiaoping Ma, National Laboratory for Materials Science, Institute of Metal Research, Shenyang, Wenhua road 72#, Shenyang 110016, P. R. China, Tel.: +86-024-83970106, E-mail:

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Received: 2016-06-27
Accepted: 2017-02-01
Published Online: 2017-05-04
Published in Print: 2017-05-15

© 2017, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111488
Keywords for this article
Solidification; Microstructures; Microsegregation; Enriched boundary layer; Discrete crystal growth

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Downloads and the impact of Open Access at IJMR
  5. Original Contributions
  6. A material selection approach using the TODIM (TOmada de Decisao Interativa Multicriterio) method and its analysis
  7. Investigation of the influence of Fe on the microstructure and properties of Ti5553 near-β titanium alloy with combinatorial approach
  8. Evolution of the temperature, microstructures and microsegregation in equiaxed solidification of Al-5 wt.% Cu alloy
  9. Phase composition and microstructure of materials in the Ir–Ru–B system prepared by arc melting and VHP sintering
  10. Thermal shock behavior of rare earth modified alumina ceramic composites
  11. Investigation of tribological and corrosion properties of CuTi–alumina nanocomposite fabricated by mechanical alloying
  12. Effect of acetic acid on corrosion behavior of AISI 201, 304 and 430 stainless steels
  13. Verification of strength mis-match of electron beam welded heavy thickness titanium alloy
  14. Short Communications
  15. Effect of toughening Fe2B by the addition of tungsten on the wear resistance of Fe–B–C alloy
  16. Microstructural stability of heat-resistant high-pressure die-cast Mg-4Al-4Ce alloy
  17. DGM News
  18. DGM News
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