Abstract
Supersaturated solid-solution alloys of Al-Ge and Al-GeSi systems up to 10at% solute contents were prepared by means of the high pressure and high temperature solid-solutioning technique. A cylindrical specimen with a size of φ6×6mm was held under a pressure of 5.4GPa at temperatures of 400-510°C for 10 hours, for the solid-solutioning treatment, and then quenched to room temperature. The lattice constants, elastic constants, electrical resistivity, and Vicker's hardness of the specimens thus obtained were measured. The shear moduli of the solid-solutions decreased with increasing solute content, and this feature was discussed in terms of the valence electron per atom ratio and the lattice distortion.
By means of the same pressure technique, the solid-solutions of Ti-Al system up to 30at%Al were prepared from the mixed powder of pure titanium and pure aluminum. The shear modulus of the titanium alloy increased with increasing Al-contents.
