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

15 August 1980

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 22 (4) , 1837-1842
https://doi.org/10.1103/physrevb.22.1837

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.

Keywords

This publication has 31 references indexed in Scilit:

Band structure and optical properties of ordered Au ${Cu}_{3}$
Physical Review B, 1979
Optical properties and electronic structure of dilute Cu-Au, Cu-Zn, Cu-Al, Cu-Ga, Cu-Si, Cu-Ge, Cu-Sn, and Cu-As alloys
Physical Review B, 1977
Two processes in the kinetics of short-range ordering and disordering in Cu-15 at% Al
Physica Status Solidi (a), 1975
OPTICAL PROPERTIES OF ORDERED AND DISORDERED Au-Cu ALLOYS
Le Journal de Physique Colloques, 1974
Interband optical properties and electronic structure ofα-phase disordered copper-aluminum alloys
Physical Review B, 1974
Optical properties and electronic structure of ordered and disordered ${Cu}_{3}$ Au
Physical Review B, 1974
Modulated Reflectivity Measurements on $α$ -phase Cu-Zn, Cu-Al, Cu-Ga, and Cu-Ge Alloys
Physical Review B, 1973
Kinetics of ordering and disordering in CuAl (15 AT %) alloys after sudden changes of annealing temperature
Scripta Metallurgica, 1973
Stacking Faults in a Cu‐15 at% Al Alloy. I. The Short Range Order and Temperature Dependence of the Stacking Fault Energy
Physica Status Solidi (b), 1968
On the Kinetics of Short‐Range Ordering in AuAg (50,50) and CuAl (85,15)
Physica Status Solidi (b), 1967