A. V. Stolbovsky, V. V. Popov, E. N. Popova

STRUCTURE AND THERMAL STABILITY OF TIN BRONZE NANOSTRUCTURED BY HIGH PRESSURE TORSION

The evolution of the structure of bronze containing 7.4 wt. % Sn under severe plastic deformation by high pressure torsion has been studied by transmission electron microscopy and microhardness measurements. The thermal stability of the structures obtained has been investigated in subsequent annealing. It is demonstrated that the presence of an enhanced amount of impurities considerably retards the relaxation processes. It is shown that, along with an enhanced thermal stability of the nanostructures obtained, the transition from the overall growth of crystallite sizes at heating to the dramatic development of recrystallization processes in the alloy under study is much smoother than in pure metals.

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