A Positron-Annihilation Study of α-Phase Copper-Aluminum Alloys

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Rotating-specimen measurements of the annihilation radiation have been carried out to investigate the Fermi surface of α Cu–Al alloys up to 15.5 at % Al. The conventional angular-correlation measurements along the [100] axis have also been performed in a long-slit geometry.
The Fermi surface of α Cu–Al alloys has been found to be similar in shape to that of Cu. A trend of the monotonical increase with Al concentration has been found both in the size of ⟨111⟩ neck and in the ⟨100⟩ Fermi momentum. The change in the Fermi surface of this alloy follows closely that of α-brass with the same e⁄a.