METHOD OF FORMING OF ULTRAFINE STRUCTURE IN NON-FERROUS ALLOYS BASED ON COPPER AND ALUMINIUM (VERSIONS) Russian patent published in 2015 - IPC C22F1/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to change of physical structure of non-ferrous metals or their alloys, and can be used in various machine engineering industries during manufacturing of high critical items operating under extreme conditions, for example for nuclear units, for aviation and shipbuilding, for electrotechnical and special applications. The method includes hardening, creation of ultrafine structure by method of equal channel angular pressing, heat treatment of the ultrafine alloy. At that under one option the equal channel angular pressing is performed before grinding of the alloy grain structure to size d_opt calculated as per equation: d_opt=4bG/π(1-ν)(σ_t-σ_i), at that heat treatment is performed by two stages by low temperature and high temperature annealing, and under another option the equal channel angular pressing is performed at optimal temperature calculated by equation: $$T_{opt}=-\frac{Q_b/k}{In\left[\xi {\dot{e}}_v{b}^3/{\left({(\rho }_{b0}\Delta b\right)}^{4}5\delta D_{b0}\right]}$$ , and heat treatment is performed by high temperature annealing.

EFFECT: increased thermal stability of the mechanical properties of ultrafine non-ferrous alloys based on copper and aluminium.

2 cl, 3 ex, 3 dwg