Static coarsening behavior of equiaxed α phase in Ti−8Al−1Mo−1V alloy

Xiao hui SHI, Zu han CAO, Zhi yuan FAN, Jürgen ECKERT, Jun wei QIAO

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Abstract

To get a deep understanding of the evolution behavior of equiaxed α phase in Ti−8Al−1Mo−1V alloy during annealing, its static coarsening mechanism was studied based on the calculations of coarsening exponent n and the activation energy for α boundary migration. The result of n=6 indicates a special coarsening mechanism of equiaxed α phase. The activation energy for α boundary migration is calculated to be 138 kJ/mol, which is close to the activation energy for grain growth of pure α-Ti. It is revealed that the coarsening of equiaxed α can be mainly attributed to the self-diffusion of Ti atoms across the α/α boundaries. Based on the experimental findings, a static coarsening kinetics model of equiaxed α grains in the α+β field is established. At last, the effects of the coarsening behavior of equiaxed α on tensile properties were studied.
Original languageEnglish
Pages (from-to)1628-1640
Number of pages13
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume31.2021
Issue number6
DOIs
Publication statusPublished - 28 Jun 2021

Bibliographical note

Publisher Copyright: © 2021 The Nonferrous Metals Society of China

Keywords

  • kinetics
  • model
  • static coarsening
  • tensile properties
  • Ti−8Al−1Mo−1V

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