Effect of isochronal annealing on the magnetic and mechanical properties of Ti-Al-Co and Ti-Al composites

Ti-Al and Ti-Al-Co metal composites have been produced by shock-wave compaction using hexogen and ammonite explosives. The microstructure, microhardness, and temperature spectra of the real part of the complex magnetic susceptibility χ ′( T ) have been studied. The measurements have been performed in the course of isochronal annealings of the samples at temperatures progressively increasing in steps of 50 K. The values of χ ′, which correspond to the isothermal sections of the spectra at 140 K and 400 K, as a function of the isochronal annealing temperature, χ ′( T ), have the form of asymmetrical bell-shaped curves. The maxima of these curves are in the region of the temperature of the α → β polymorphic transformation of cobalt. Possible reasons for this behavior of χ ′ have been discussed.