Abstract
The results of studies of the structural-phase state of copper and tin mixture powders (12-20 wt.% Sn), formed during high-energy mechanical processing in a planetary ball mill, are presented. The effects of mechanochemical synthesis of composites during sintering and formation of the structure of sintered bronzes are considered. The relationship between the tin content and the formation of grain-boundary segregations and their influence on the properties of materials is shown. Thus, an increase in the concentration of tin contributes to the acceleration of grain-boundary interactions, a decrease in the rate of bulk diffusion, followed by the formation of supersaturated bulk and grain-boundary solid solutions. For the composition of the mixture with a tin content of 18-20 wt.% during mechanochemical synthesis, grain-boundary supersaturation with tin is achieved by more than 2 times, which contributes to dispersion strengthening of sintered materials based on them and provides microhardness within 2.1-3.0 GPa in a temperature range of 20-800 °С.
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