Structure and microhardness of Zn – 2 wt. % Bi alloy
Keywords:
zinc – bismuth alloy, cellular structure, texture, dispersed bismuth particles, microhardnessAbstract
The results of a study of the structure and microhardness of a Zn – 2 wt. % Bi alloy fabricated at different melt cooling rates are presented. It was found that alloy crystallisation at an average cooling rate of 10 K/s causes the formation of cells in bulk samples, while at a cooling rate of 105–106 K/s it leads to the formation of dispersed bismuth precipitates in rapidly solidified foils. The average diameter of bismuth particles located within the cell volume and at their boundaries are 0.1 and 0.3 μm, respectively. The average grain size of the bulk samples is an order of magnitude larger than that of the rapidly solidified foils. In massive samples a weakly expressed zinc texture (10̅13) + (20̅21) is formed, while in rapidly solidified foils zinc textures (0001) + (10̅10) and (10̅11) + (11̅22) are formed (in the layer adjacent to the crystalliser surface and in the free surface layer, respectively). During isochronous annealing of rapidly solidified Zn – 2 wt. % Bi foils, a decrease in microhardness occurs in the temperature range of 50 –120 °C due to the decomposition of the supersaturated solid solution of bismuth in zinc and the coalescence of dispersed bismuth precipitates in the temperature range of 50 –120 °C. The change in microhardness in the temperature range of 240 –280 °C is due to the eutectic transformation.
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