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Prediction of the solidification path of Al-4.37Cu-27.02Mg ternary eutectic alloy with a unified microsegregation model coupled with Thermo-Calc

  • Erhu Yan , Xinzhong Li , Yanqing Su , Dongmei Liu , Daming Xu , Jingjie Guo and Hengzhi Fu
Published/Copyright: March 30, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 3

Abstract

An extended unified microsegregation model with solid back diffusion effects and five different dendrite morphologies was used to investigate the solidification path of Al-4.37Cu-27.02Mg (wt.%) ternary eutectic alloy at different cooling rates and solid back diffusion coefficients, coupled with Thermo-Calc. It was indicated that the cooling rates (Rf) had no obvious effect on the solidification path which was (L + α) → (L + α + T) → (L + α + β + T); but the solid back diffusion coefficient (Φ) had a great effect on the solidification path, which evolved gradually from (L + α) → (L + α + T) → (L + α + β + T) into (L + α) → (L + α + T) when Φ increased from 0 to 1. The volume fractions of primary α phase (Vα), binary eutectic (V2E) and ternary eutectic (V3E) at each solidification path were calculated. It was shown that V2E decreased with the increase of Rf whereas V3E increased and Vα was almost invariant. The dependence of V2E, V3E and Rf were determined by linear regression analysis given as: V2E = −2.5lgRf + 47.5; V3E = 6.4lgRf + 47. Increase in Φ lead to increases in Vα and V2E and decrease in V3E. The predicted soldification paths and volume fractions of Al-4.37Cu-27.02Mg ternary eutectic alloy at different cooling rates were in good agreement with experimental results.

Keywords: Solidification path; Microsegregation model; Al–Cu-Mg eutectic alloy; Thermo-Calc
* Correspondence address, Xinzhong Li, School of Materials Science and Engineering, Harbin Institute of TechnologyHarbin 150001PR. China. Tel.: +86-451-86418815, Fax: +86-451-86221048, E-mail:

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Received: 2011-11-2
Accepted: 2012-8-7
Published Online: 2014-03-30
Published in Print: 2013-03-14

© 2013, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110854
Keywords for this article
Solidification path; Microsegregation model; Al–Cu-Mg eutectic alloy; Thermo-Calc

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. The thermodynamics of boron extraction from liquid silicon using SiO2–CaO–MgO slag treatment
  5. Viscosity estimation of semi-solid alloys based on thermal simulation compression tests
  6. Original Contributions
  7. Experimental study of phase equilibria in the “SnO”–CaO–SiO2 system in equilibrium with tin metal
  8. Prediction of the solidification path of Al-4.37Cu-27.02Mg ternary eutectic alloy with a unified microsegregation model coupled with Thermo-Calc
  9. Evaluation of the effective diffusion coefficient of boron in the Fe2B phase in the presence of chemical stresses
  10. Morphology evolution of γ′ precipitates in GTD-111 Ni-based superalloy with heat treatment parameters
  11. Hot forming of a new steel used in stamping dies and tooling
  12. Mechanical properties and corrosion behaviour of freestanding, precipitate-free magnesium WE43 thin films
  13. Sliding wear performance of Fe-, Ni- and Co-based hardfacing alloys for PTA cladding
  14. The suitability of selected austenitic stainless steels and hastelloy C276 alloys as substrates for thin film deposition using spray pyrolysis
  15. Synthesis, structural, optical and thermal analysis of nanostructured ZnO
  16. Electrical conductivity variation of (Bi2Te3)0.25(Sb2Te3)0.75 crystal grown using the zone melting method
  17. X-ray Absorption Near Edge Structure Studies of Pb1-xMnxTe(In, Ga) Systems
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