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

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Abstract
The aluminum K and iron L emission bands and the aluminum Kα3 and Kα4 satellite lines from a series of aluminum‐iron binary alloys have been studied using 6‐kV electron excitation and a flat crystal x‐ray vacuum spectrometer equipped with a flow proportional counter. It is found that the AlK band energy position and the AlKα4/Kα3 intensity ratio are both linearly dependent on alloy composition. As the aluminum concentration is lowered, the AlK band intensity maximum shifts to lowery energy and the band becomes more symmetrical in shape. In general, these results are very similar to those obtained previously from the aluminum‐nickel system. The FeLIII band undergoes very little change in shape but shifts to higher energy as the aluminum‐to‐iron ratio is increased. The spectral changes are interpreted as indicating that the predominately metallic bond in the pure metals acquires a certain amount of covalent‐like character in the alloys with the aluminum atoms behaving as electron donors.