Formation mechanism of lamellar alpha in titanium through accurate simulation

Xueyan Liu, Hongwei Li, Mei Zhan

科研成果: 期刊稿件文章同行评审

8 引用 (Scopus)

摘要

The lamellar α, transformed β matrix and spheroidization products of them combine to form all typical microstructures in titanium alloys. Accurately predicting the formation of lamellar α and revealing the precipitation mechanism therefore become vital for tailoring the microstructure and thus optimizing the properties of titanium alloys. A mixed-mode model combined with cellular automaton is proposed to simulate the process of nucleation and growth of lamellar α phase in isothermal treatment of Ti alloys. In this model, the driving force that is dependent on temperature, the solute concentration in two phases and interface is derived; the soft impingement effect, considering the microscopic morphology evolution of lamellar α phase in two dimensions, is well described by not only approximating the diffusion field function in front of the interface as a polynomial but also introducing the area and interface length of lamellar α into the mass conservation law. A comparision with the interface-controlled and diffusion-controlled models shows that the mixed-mode model gives obviously more accurate description of β-to-α phase transformation kinetics. Furthermore, it is also found that the interfacial migration coefficient, and the microscopic morphology of lamellar α phase to be precipitated have great effects on the mixed mode character (in especial the change in controlled mode) and the kinetics of entire phase transformation process.

源语言英语
文章编号152085
期刊Journal of Alloys and Compounds
811
DOI
出版状态已出版 - 30 11月 2019

指纹

探究 'Formation mechanism of lamellar alpha in titanium through accurate simulation' 的科研主题。它们共同构成独一无二的指纹。

引用此