The Measurement of the Young\u27s Modulus of Metals and Alloys by an Interferometric Method. III : The Influence of Heat-Treatment on the Young\u27s Moduli of Fe-Al Alloys, and the Young\u27s Moduli of Ni-Al, Al-Cu Alloys and German Silver in the Annealed State

Abstract

The measurement described in the earlier papers of this series has been extended to the study of the influence of heat-treatment on the Young\u27s moduli of Fe-Al alloys having the composition up to 14.75 per cent aluminium. It becomes clear that the Young\u27s modulus of ordered Fe_3Al (13.8 per cent aluminium) is smaller than that of disordered one. This result is contrary to the cases of Cu_3Au and Ni_3Mn. Moreover, measurement has been done on the static Young\u27s moduli of Ni-Al alloys (up to 5.17 per cent aluminium), several specimens of Al-Cu alloys and german silver. The Young\u27s modulus vs. composition curve of Ni-Al alloys seems to be akin to the curve peculiar to Ni-alloys, such as Ni-Cu and Ni-Mn systems