Metallurgical and Materials Transactions A

, Volume 50, Issue 5, pp 2272–2278 | Cite as

Constrained Dendritic Growth and Solute Concentration Effects in Rapidly Solidified Co-Cr Alloys

  • A. L. Ramirez-LedesmaEmail author
  • H. F. Lopez
  • J. A. Juarez-Islas


Growth temperature and dendrite tip radius equations were employed in this work in order to predict the experimental conditions under which a Co-Cr alloy was produced having a single γ-phase microstructure free from interdendritic segregation. The outcome of these predictions indicated that in Co alloys containing 20 to 25 wt pct Cr, single γ-phase dendritic microstructures are achieved independently of the implemented solidification growth velocities. Moreover, these alloys are found to be essentially free from interdendritic segregation. Co alloys containing 30 to 35 wt pct Cr exhibit both the γ-phase and the eutectic constituent when solidification rates (V) are below 0.1 and 0.5 mm/s, respectively. Alternatively, the eutectic constituent is suppressed when the solidification growth velocities exceed these values. In particular, it is found that a single-phase microstructure can be achieved when the solidification growth rates exceed the transition velocity between constitutional supercooling and the absolute stability conditions.



The authors gratefully acknowledge the technical support from A. Tejeda and C. Flores-Morales and the financial support from UNAM/PAPIIT IT100316.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • A. L. Ramirez-Ledesma
    • 1
    Email author
  • H. F. Lopez
    • 2
  • J. A. Juarez-Islas
    • 3
  1. 1.Department of Mechanical EngineeringPolitecnico di MilanoMilanItaly
  2. 2.Materials Science and Engineering Department, CEASUniversity of Wisconsin MilwaukeeMilwaukeeUSA
  3. 3.Instituto de Investigaciones en MaterialesUniversidad Nacional Autónoma de MéxicoMéxicoMexico

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