Abstract
The results of the investigation of the supersaturation temperature - in the range 800÷1050°C - influence on changes in the microstructure and hardness of the Ti24Nb4Zr8Sn alloy. The microstructure analysis was performed by means of the light microscope Axiovert 200MAT of the Zeiss Company. At the supersaturation temperature of 950°C examinations were performed by means of the scanning electron microscopy (SEM), while the occurring phases were identified by using X-ray phase analysis method. Tin precipitates of a high dispersion were found in the phase β matrix. Along with the decreasing cooling rate of the alloy, from a temperature of 950°C, none essential changes in the microstructure were noticed (only a small hardness decrease). Hardness measurements were carried out by means of the Vickers apparatus, type HP0 250. It was shown that within the tested supersaturation temperatures the hardness is within a narrow range 216÷246 HV, while the average diameter of a flat grain of the primary β phase increases more than twice.The obtained results will be used at elaborating ageing parameters of the Ti24Nb4Zr8Sn alloy. In future, they can be also useful at designing chemical compositions, microstructures and heat treatment technologies of new, single-phase alloys on the titanium matrix.
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