Grain growth behavior of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy during isothermal β heat treatments
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Isothermal β heat treatments of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy were performed at the temperature of 1040–1240 °C to examine the influence of heating conditions on grain growth of the alloy. The results show that the grain size increases with heating temperature and holding time increasing. Rapid β grain growth of the alloy takes place at the temperature of over 1140 °C. The grain growth kinetics for the alloy follows the classical isothermal grain growth law. The growth time exponent (n) of 0.5651 and activation energy (Q) of 129.6 kJ·mol−1 are determined. Finally, in order to determine the grain size under different heating conditions, the grain growth model of the alloy was established.
KeywordsIsothermal heating Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy Grain growth Model
This study was financially supported by the National Natural Science Foundation of China (No. 51261020), the Aeronautical Science Foundation of China (No. 2014ZE56015) and the Educational Committee of Jiangxi Province of China (No. GJJ14505).
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