Effect of Alloying on Aluminum K and Copper L X-Ray Emission Spectra in the Aluminum-Copper System

Publisher Website
Google Scholar
Abstract
Data for the Al K emission band, Al Kα satellites and Cu LIII band in Al‐Cu alloys (10%–100% Al) are presented. Significant changes in the spectra are noted with changes in composition. The Al K emission band is split and the long‐wavelength component shifts to longer wavelengths and becomes dominant with a decrease in Al concentration. The short‐wavelength component shifts only slightly and maintains the typical sharp, short wavelength‐emission edge seen in pure aluminum. Separation between high‐ and low‐energy components in the Al K band is as much as 4 eV (10% Al) and extrapolates to about 4.5 eV for very dilute alloys, which is nearly the calculated excitation energy of 3s2→3s3p in Al+. The Al K satellites Kα3 and Kα4 show corresponding intensity changes with alloy composition. The intensity ratio Kα4/Kα3 changes linearly (for 6‐kV excitation) from 0.48 in Al to 0.70 in 10 Al‐90 Cu. The Cu LIII band also shows changes in shape with alloying but the changes are not as large as observed for the Al K band. The copper band shifts linearly to lower energy as more and more aluminum is added.