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Journal of Materials Science

, Volume 29, Issue 15, pp 3913–3918 | Cite as

Structure, properties and response to heat treatment of melt-spun Al-Y and Al-La alloys

  • B. Dill
  • Y. Li
  • M. Al-Khafaji
  • W. M. Rainforth
  • R. A. Buckley
  • H. Jones
Papers

Abstract

Al-Y and Al-La binary alloys containing 0.7–18 wt% (0.2–6.3 at%) Y and 0.9–18 wt% (0.2–4.2 at%) La, were rapidly solidified by chill-block melt-spinning to produce ribbons between 35 and 70 μm thick. Microstructures were of the classical zone A/zone B type with a notable increase in αAl lattice parameter for the Al-6.3 at% Y composition, which exhibited a Knoop hardness of 430±30 kg mm−2 as-spun. Isochronal ageing for 2 h at 200–500 °C gave significant hardening at 200 and/or 300 °C for all of the more concentrated alloys, the largest responses being produced by Al-6.3 at % Y and Al-4.2 at % La at 200 °C. X-ray diffraction asspun indicated the presence of only αAl and equilibrium Al11La3 in the Al-La alloy ribbons and αAl and a non-equilibrium Al4Y/Al11Y3 in the Al-Y ribbons. This non-equilibrium Al-Y phase was identified by X-ray diffraction as isomorphous with orthorhombic or tetragonal Al11 La3 with lattice parameters determined as ao = 0.42 ± 0.02 nm (bo = 1.26 ± 0.06 nm) and co = 0.97 ± 0.05 nm. TEM showed that it was present as an intercellular network with Energy dispersive spectroscopic analysis indicating an average composition Al-46 wt% Y consistent with the Al4Y/Al11Y3 stoichiometry and diffraction patterns consistent with an orthorhombic or tetragonal cell with these lattice parameters. While no significant change in phase constitution of the Al-La ribbons was detected by X-ray diffraction as a result of heat treatment, the Al11Y3 in Al-Y ribbons was seen to be replaced by βAI3Y on heat treatment at 400 and 500 °C.

Keywords

Heat Treatment Binary Alloy Energy Dispersive Spectroscopic Analysis Average Composition Notable Increase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • B. Dill
    • 1
  • Y. Li
    • 1
  • M. Al-Khafaji
    • 1
  • W. M. Rainforth
    • 1
  • R. A. Buckley
    • 1
  • H. Jones
    • 1
  1. 1.Department of Engineering MaterialsUniversity of SheffieldSheffieldUK

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