Phase transformation kinetics of Ti-1300 alloy during continuous heating
来源期刊：Rare Metals2015年第4期
论文作者：Ming-Pan Wan Yong-Qing Zhao Wei-Dong Zeng
文章页码：233 - 238
摘 要：The a + b → b phase transformation kinetics of Ti-1300 alloy during continuous heating at different heating rates were investigated using dilatometric method.Results show that the curves of the a + b → b phase transformation exhibit a typical S-shaped pattern, which indicates that the a + b → b phase transformation is a nucleation-growth-controlled process. The overall activation energy of the a + b → b transformation of the alloy is797 k J mol-1. The nucleation and growth mechanism of the a + b → b transformation was also investigated using the non-isothermal Avrami exponent. The Avrami exponent during a + b → b transformation process significantly changes with transformed volume fraction increasing, which indicates that the a + b → b transformation mechanism in the Ti-1300 alloy varies at different sections.
Ming-Pan Wan1,2，Yong-Qing Zhao3，Wei-Dong Zeng1
1. State Key Laboratory of Solidification Processing, Northwest Polytechnical University2. College of Materials and Metallurgy, Guizhou University3. Northwest Institute for Nonferrous Metal Research
摘 要：The a + b → b phase transformation kinetics of Ti-1300 alloy during continuous heating at different heating rates were investigated using dilatometric method.Results show that the curves of the a + b → b phase transformation exhibit a typical S-shaped pattern, which indicates that the a + b → b phase transformation is a nucleation-growth-controlled process. The overall activation energy of the a + b → b transformation of the alloy is797 k J mol-1. The nucleation and growth mechanism of the a + b → b transformation was also investigated using the non-isothermal Avrami exponent. The Avrami exponent during a + b → b transformation process significantly changes with transformed volume fraction increasing, which indicates that the a + b → b transformation mechanism in the Ti-1300 alloy varies at different sections.
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