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Effects of copper content and liquid separation on the microstructure formation of Co–Cu immiscible alloys

  • Wei Yang , Yan Long Zhang , Wen He and Zhi Feng Xu
Published/Copyright: September 15, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 105 Issue 9

Abstract

Applying a melt-fluxing method combined with cyclical superheating, rapid solidification of undercooled Co70Cu30, Co50Cu50 and Co30Cu70 melts was performed to investigate the effects of alloy composition and immiscibility on the resultant non-equilibrium solidification microstructure. As for the samples without liquid separation, grain refinement of primary α-Co dendrite occurs clearly with increases in both copper content and initial undercooling. In contrast, the influence of alloy composition on microstructure evolution is weakened due to the occurrence of liquid separation at larger undercooling, where slight variations in the solute concentration and micro-hardness for Co-rich phase are obtained. After a quantitative thermodynamic calculation, the process of liquid separation is described, which gives an excellent explanation for the observed experimental results.

Keywords: Rapid solidification; Metals and alloys; Microstructure; Phase transitions
* Correspondence address, Dr. Wei Yang, National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Fenghe southroad, 696#, Nanchang, 330063, Jiangxi, P.R. China, Tel.: +86-791-86453167, Fax: +86-791-83953300, E-mail:

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Received: 2013-12-22
Accepted: 2014-04-03
Published Online: 2014-09-15
Published in Print: 2014-09-15

© 2014, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111095
Keywords for this article
Rapid solidification; Metals and alloys; Microstructure; Phase transitions

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Diffusivities and atomic mobilities of an Sn–Ag–Bi–Cu–Pb melt
  5. Experimental study of the phase relations in the Fe–Cr–Si ternary system at 700°C
  6. Effect of molybdenum on the microstructure, mechanical properties and corrosion behavior of Ti alloys
  7. Mechanism of grain refinement and coarsening in undercooled Ni–Fe alloy
  8. Effects of copper content and liquid separation on the microstructure formation of Co–Cu immiscible alloys
  9. Influence of the solidification temperature range on Gasar structures made from Cu–Mn alloys
  10. Effect of ageing time on mechanical properties and tribological behaviour of aluminium hybrid composite
  11. Microstructure and tensile properties of a friction stir welded Al–Mg–Si alloy
  12. Lüders effect in Al 99.7% extruded via the KoBo method
  13. Reduced graphene oxide nanocomposites with different diameters and crystallinity of TiO2 nanoparticles – synthesis, characterization and photocatalytic activity
  14. Constitutive modelling of mill loads during hot rolling of AISI 321 austenitic stainless steel
  15. X-ray stress measurement with two-dimensional detector based on Fourier analysis
  16. People
  17. People
  18. People
  19. DGM News
  20. Personal
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