The article investigates the elastic, thermal, and mechanical properties of Co-Fe-V-Ni alloys alloyed with titanium and aluminum after deformation, deformation and aging, and also after quenching and aging. It analyzes the structure on the basis of neutron diffraction, radiographic, and electron-microscope methods. Special traits of the strengthening of artifically aged alloys of the system Co-Fe-V-Ni alloyed with titanium and aluminum were established. The article suggests the composition of an alloy with temperature-stable modulus of elasticity and low coefficient of linear thermal expansion within a broad temperature range 20-350-degrees-C. A regime for strengthening the alloy was worked out.