Microstructural stability of rapidly quenched AlFeMo alloys

We investigated the microstructural stability of rapidly quenched Al-8%Fe-2%Mo alloys by measuring the evolution of thermoelectric power during ageing between 300 °C and 500 °C, and by transmission electron microscopy and small-angle X-ray scattering observation. Four stages of evolution were found corresponding to the evolution of the solid solution and S-phase into a final incoherent generalized precipitation. The addition of Mo does not delay this evolution but gives a more homogeneous microstructure.