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Transactions of the Indian Institute of Metals

, Volume 71, Issue 11, pp 2635–2638 | Cite as

Influence of Minor Additions on Icosahedral Short-Range Order (ISRO) and Its Consequences on Nucleation and Solidification Growth Kinetics in fcc Alloys

  • J. Zollinger
  • M. Rappaz
Technical Paper

Abstract

The present contribution reviews the recent progress related to the influence of icosahedral short-range order (ISRO) and icosahedral quasicrystal (iQC) formation on the solidification of fcc alloys through minor solute element additions. From intensive crystallographic analysis of multi-twinned region in as-cast Al-based and Au-based fcc alloys, it has been shown recently that a so-called iQC-mediated nucleation mechanism occurs when a few hundred ppm of Cr and Ir, respectively, are added to the melt (Kurtuldu et al. in Acta Mater 61(19):7098–7108, 2013; Acta Mater 70:240–248, 2014). Similarly, it appears that the growth directions of dendrites in Al–Zn/Cr are also influenced by ISRO in the liquid, thus showing an attachment kinetics effect (Kurtuldu in Influence of trace elements on the nucleation and solidification morphologies of fcc alloys and relationship with icosahedral quasicrystal formation, 2014). Similar observations have been made recently in pink gold alloys with Ir additions, when the solidification speed is increased (Zollinger et al. in Acta Mater, 2018).

Keywords

Gold alloys Nucleation Growth kinetic Growth direction Quasicrystals Solidification 

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Copyright information

© The Indian Institute of Metals - IIM 2018

Authors and Affiliations

  1. 1.Department of Metallurgy and Materials Science and Engineering, Institut Jean LamourUniversité de LorraineNancyFrance
  2. 2.Laboratory of Excellence on Design of Alloy Metals for Low-mAss Structures (‘LabEx DAMAS’)NancyFrance
  3. 3.Institute of MaterialsÉcole Polytechnique Fédérale de LausanneLausanneSwitzerland

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