%0 Journal Article
%T Determination of Phase Transformation for TC21 Ti-Alloy by Dilatometry Method
%A Ramadan N. Elshaer
%A Khaled M. Ibrahim
%A Azza F. Barakat
%A Ahmed I. Farahat
%A Reham R. Abbas
%J Open Journal of Metal
%P 1-10
%@ 2164-277X
%D 2019
%I Scientific Research Publishing
%R 10.4236/ojmetal.2019.91001
%X The ¦Á + ¦Â ↔ ¦Â phase transformation kinetics of TC21 Ti-alloy during continuous heating and cooling were studied using a dilatometric technique. Dilatometric heating curve exhibited that two characteristic reflection points can be observed with increasing the heating temperature. Ts referred to the initial transformation temperature of ¦Á + ¦Â ¡ú ¦Â and Tf referred to the final transformation temperature of ¦Á + ¦Â ¡ú ¦Â. Ts was reported at 720°C, whereas the corresponding Tf was obtained at 950°C. The initial and final transforming temperatures by the first derivative curve were reported at 730°C and 955°C, respectively, which are close to the values obtained in the dilatometric heating curve. Dilatometric cooling curve showed that the starting temperature of ¦Â ¡ú ¦Â + ¦Á phase transformation was 880°C; however, the corresponding finishing temperature was 670°C. The starting and finishing temperatures using the first derivative curve were obtained at 665°C and 885°C, respectively. The first derivative for the studied dilatometric heating and cooling curves showed that the starting and finishing temperatures of ¦Á + ¦Â ↔ ¦Â phase transformation were more accurate and objective. Results show the ¦Á + ¦Â ¡ú ¦Â transformation heating curve exhibits a typical S-shaped pattern.
%K TC21 Ti-Alloy
%K Phase Transformation
%K Dilatometry
%K Heating
%K Cooling
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=94555