Study on non-isothermal transformation of Ti-6Al-4V in solution heating stage

Hui Yu, Wei Li, Haibei Zou, Songsong Li, Tongguang Zhai, Ligang Liu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


In order to understand the non-isothermal transformation behavior of Ti-6Al-4V titanium alloy in the continuous heating stage of solution treatment, thermal dilatometry tests with heating rates of 0.1~0.8 °C/s were designed. The conversion between the expansion amount and the transformed volume fraction was realized by the lever principle, and the transformation characteristics of α + β → β were quantified based on the Kissinger-Akahira-Sunose (KAS) theory and the modified Johnson-Mehl-Avrami (JMA) model. The results show that the phase transformation kinetics curves present typical “S” patterns, and the element diffusion transformation controls the nucleation and growth of new grains during the transformation of α + β → β. The phase transformation interval gradually moves to high temperature regions with the increase of heating rates, and the phase transformation activation energy is 445.5 kJ·mol−1. The phase transformation process is divided into three stages according to the relationship between the Avrami exponent n and the transformed volume fraction fT. These three stages correspond to different stages of grain nucleation or growth.

Original languageEnglish
Article number968
Issue number9
StatePublished - Sep 2019

Bibliographical note

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.


  • JMA model
  • Non-isothermal dilatometry
  • Solution treatment
  • Ti-6Al-4V
  • Transformation kinetics

ASJC Scopus subject areas

  • Metals and Alloys
  • General Materials Science


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