Effect of Alloying on the AluminumKand NickelLX-Ray Emission Spectra in the Aluminum-Nickel Binary System

The aluminum $\frac{K{\alpha }_4}{K{\alpha }_3}$ satellite-line intensity ratio and the aluminum $K$ and nickel $L$ emission bands from a series of aluminum-nickel binary alloys have been studied using 6-kV electrons and a flat-crystal x-ray vacuum spectrometer equipped with a flow counter. The $\frac{K{\alpha }_4}{K{\alpha }_3}$ intensity ratio varies in a linear manner with aluminum content, going from 0.48 in the pure metal to 0.84 in the 4 Al-96 Ni alloy. As the aluminum content is decreased, the Al $K$ band shifts progressively to lower energy and becomes more symmetrical in shape. The $K$-band intensity maximum shifts in a linear manner with aluminum content although the Ni $L_{\mathrm{III}}$ band does not. It appears from the data, however, that the Ni $L_{\mathrm{III}}$ emission edge broadens considerably as the nickel content is decreased and that the overlapping high-energy satellite becomes progressively weaker.