Optical investigations of short-range ordering of α-copper-aluminum alloys

Academic Article

Abstract

  • Differential reflectometry studies were performed on a Cu-17 at.% Al alloy. The differential reflectogram of a short-range ordered versus a disordered specimen shows a pronounced peak at 2.64 eV and a shoulder around 5 eV which is attributed to new structure in the ordered state. No such structure could be observed for a Cu-5 at.% Al alloy, confirming earlier reports in the literature that copper alloys containing less than 9 at.% aluminum undergo very little, if any, short-range ordering transformation. The new structure can be explained using the folding-band concept which yields additional interband transitions. Short-range ordering decreases the energy of one of the peaks in the differential reflectograms by 0.04 eV. This shift is equivalent to an increase in solute concentration amounting to one-half of a percent. © 1980 The American Physical Society.
  • Authors

    Published In

    Digital Object Identifier (doi)

    Author List

  • Andrews JB; Nastasi-Andrews RJ; Hummel RE
  • Start Page

  • 1837
  • End Page

  • 1842
  • Volume

  • 22
  • Issue

  • 4