Light Metals 2019 pp 1463-1467 | Cite as

Heat Treatments for Precipitation of Scandium-Containing Dispersoids in an Si-Containing Aluminum Alloys

  • Timothy LanganEmail author
  • Mahendra Ramjayam
  • Paul Sanders
  • Thomas Wood
  • Thomas Dorin
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Benefits of alloying Sc with aluminum resulting from the precipitation of coherent Al3Sc dispersoids, including refined microstructure, increased strength, and improved weldability, have been demonstrated for a number of commercial aluminum alloys. Historically interactions between Sc and Si have limited the benefits of Sc additions in Al-Mg-Si 6xxx alloys. The first step towards developing a Sc containing 6xxx-alloys requires studying the interaction between Si and Sc. Hence, this work characterizes the aging response associated with precipitation of Si-modified Al3Sc dispersoids in a Sc-containing Al-Si alloys. The work reported in this paper focuses on understanding the breakdown of the solid solution of Sc in Si-containing aluminum alloys. Results of this study can be used to define heat treatment schedules for scandium containing 6xxx alloys.


Aluminium–silicon Scandium Dispersoids Homogenization 


  1. 1.
    Røyset J and Ryum N (2005) Scandium in aluminium alloys. Int Mater Rev 50 (1):19–44.CrossRefGoogle Scholar
  2. 2.
    Dorin T, Ramajayam M, Vahid A, and Langan T (2018) Aluminum Scandium Alloys, In: Fundamentals of Aluminium Metallurgy. Elsevier, New York, p 439–494.CrossRefGoogle Scholar
  3. 3.
    Gazizov M, Teleshov V, Zakharov V, and Kaibyshev R (2011) Solidification behaviour and the effects of homogenisation on the structure of an Al-Cu-Mg-Ag-Sc alloy. J Alloys Compd 509 (39):9497–9507.CrossRefGoogle Scholar
  4. 4.
    Gong Z, Zheng ZQ, Jia M, Sang FJ, and Chen XR (2016) Effects of Cu content on microstructure and mechanical properties of Al-Cu-Li-Sc alloy. Zhongguo Youse Jinshu Xuebao Chinese J Nonferrous Met 26 (6): 1182–1190.Google Scholar
  5. 5.
    Lee SL, Wu CT, and Chen YD (2015) Effects of Minor Sc and Zr on the Microstructure and Mechanical Properties of Al-4.6Cu-0.3 Mg-0.6Ag Alloys. J Mater Eng Perform 24 (3): pp 1165–1172.CrossRefGoogle Scholar
  6. 6.
    Rokhlin LL, Bochvar NR, Rybal’chenko OV, Tarytina IE, and Sukhanov AV (2012) Phase equilibria in aluminum-rich Al-Sc-Si alloys during solidification. Russ. Metall. Met 2012 (7):606–611.CrossRefGoogle Scholar
  7. 7.
    Dorin T, Ramajayam M, Lamb J, and Langan TJ (2017) Effect of Sc and Zr additions on the microstructure/strength of Al-Cu binary alloys. Mater Sci Eng A, In Press.Google Scholar
  8. 8.
    Røyset J, Hovland H, and Ryum N (2011) An investigation of dilute Al-Sc-Si alloys. 396–402.Google Scholar
  9. 9.
    Sukhanov AV, Rokhlin LL, and Bochvar NR (2011) Construction of Al-based solid-solution range boundaries in the Al-Sc-Si system at 550 and 500° C. Russian Metallurgy (Metally) 11: 1064–1068.CrossRefGoogle Scholar
  10. 10.
    Dorin T, Ramajayam M, and Langan TJ (2017) Effects of Mg, Si and Cu on the formation of the Al3Sc dispersoids. Proc. 16th Int. Conf. Alum. Alloys.Google Scholar
  11. 11.
    Booth-Morrison C, Mao Z, Diaz M, Dunand DC, Wolverton C, and Seidman DN (2012) Role of silicon in accelerating the nucleation of Al3(Sc,Zr) precipitates in dilute Al–Sc–Zr alloys. Acta Mater 60 (12): 4740–4752.CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Timothy Langan
    • 1
    Email author
  • Mahendra Ramjayam
    • 2
  • Paul Sanders
    • 3
  • Thomas Wood
    • 3
  • Thomas Dorin
    • 2
  1. 1.Clean Teq LtdNotting HillAustralia
  2. 2.Institute for Frontier MaterialsDeakin UniversityGeelong, Waurn PondsAustralia
  3. 3.Michigan Technological UniversityHoughtonUSA

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