Physicomechanical properties of nickel-base composite materials with dispersed crystallizing glass particles. Part II

Abstract

1. With rise in the amount of dispersed phase, the hardness of a composite material increases and its ductility decreases, the actual extent of these changes depending upon the chemical composition of the silicate phase. 2. Tests have shown that, at 20°C, the short-time strength is a maximum for pure nickel, and falls with increase in dispersed-phase content. 3. In the test temperature range 20–400°C, a definite correlation is observed between the short-time strength of composite materials and the coefficient of linear thermal expansion of their dispersed silicate phases. In composites with dispersed phases having a low coefficient of thermal expansion, the strengthening effect is more pronounced. 4. A nickel-base composite material containing dispersed silicate phase I possesses the best operating characteristics at 800°C. With decrease in the degree of dispersion of the strengthening phase, the mechanical properties of the material improve.