Effects of high misfit on isothermal β → ω phase transformation in Ti-19V alloy: A three-dimensional phase-field simulation
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Titanium-based alloys have been used extensively in the nuclear applications, aerospace industry, medical domain, military field, petrochemical industry and other high-tech areas. The omega (ω) phase formation significantly impacts the mechanical and physical properties of Titanium alloys. This study developed a phasefield model to simulate the microstructural evolution during the isothermal β → ω phase transformation in a Ti- 19 at.%V alloy. While reflecting the essential physics of a mixed diffusive–displacive mechanism that leads to β → ω phase transformation and considering the interplay between the interfacial energy and elastic strain energy on the morphology of ω precipitates, the simulations appropriately predicted the microstructural evolution of the ω phase and the ω precipitates homogeneously distributed in the β matrix. During the isothermal evolution of ω precipitates, the morphology of ω precipitates changes from ellipsoidal to cuboidal, which is the result of the combined effect of anisotropic interfacial energy, elastic strain energy and impingement.
Abstract
Titanium-based alloys have been used extensively in the nuclear applications, aerospace industry, medical domain, military field, petrochemical industry and other high-tech areas. The omega (ω) phase formation significantly impacts the mechanical and physical properties of Titanium alloys. This study developed a phasefield model to simulate the microstructural evolution during the isothermal β → ω phase transformation in a Ti- 19 at.%V alloy. While reflecting the essential physics of a mixed diffusive–displacive mechanism that leads to β → ω phase transformation and considering the interplay between the interfacial energy and elastic strain energy on the morphology of ω precipitates, the simulations appropriately predicted the microstructural evolution of the ω phase and the ω precipitates homogeneously distributed in the β matrix. During the isothermal evolution of ω precipitates, the morphology of ω precipitates changes from ellipsoidal to cuboidal, which is the result of the combined effect of anisotropic interfacial energy, elastic strain energy and impingement.