3D Phase Field Simulation of Factors Influencing the Microstructure Morphology of Lamellar Ti-6Al-4V Alloy
Received date: 2023-09-19
Revised date: 2023-10-23
Online published: 2024-01-15
Supported by
National Natural Science Foundation of China(U2241245,91960202);Aeronautical Science Foundation of China(2022Z053092001);National Key Laboratory Foundation of Science and Technology on Materials under Shock and Impact(6142902220301);Opening Project of National Key Laboratory of Shock Wave and Detonation Physics(2022JCJQLB05702)
Ti-6Al-4V, a typical dual-phase titanium alloy, has mechanical properties largely determined by its microstructures. However, the absence of three-dimensional (3D) information regarding the relative orientation relationships of grain boundary α, α lamellae, and α side branches, hinders precise microstructure control. In this study, using thermodynamic data from Pandat and Thermo-Calc, along with kinetic data from DICTRA, the 3D morphology of α lamellae in Ti-6Al-4V alloy was simulated via the phase field method. This study simulated the influence of interfacial energy anisotropy on the growth of α lamellae at a heat treatment temperature of 820°C and analyzed the corresponding solute field. The findings reveal that interface energy anisotropy considerably affects the morphology of α lamellae. When the anisotropy of the interface energy increased from 0.4:0.1:1.0 to 0.8:0.1:1.0, the α lamellae transformed from a thick rod shape to a slender needle shape. Higher anisotropy levels lead to accelerated growth rates of α lamellae. Variation in interface anisotropy, primarily affect the density and growth rate of α lamellae, while their growth direction remains consistent. Additionally, the width of individual lamellae progressively widens under different interface anisotropies. The phase-field simulation results align closely with experimental findings. Notably, the 3D simulation results of α lamellae organization offer more detailed insights into the side branches of α lamellae than two-dimensional (2D) SEM images. In 3D simulation, it can be observed the growth morphology of side branches at different positions of grains. The results indicate that the angle between the main lamellae and the side branches includes experimental observations of 30° and random angles.
Key words： Ti-6Al-4V; phase-field; α lamellae; interfacial energy; solute field
ZHANG Yao , QI Min , SUN Jia , WU Ting , MA Yingjie , WANG Hao , YANG Rui . 3D Phase Field Simulation of Factors Influencing the Microstructure Morphology of Lamellar Ti-6Al-4V Alloy[J]. Acta Metall Sin, 2024 , 60(9) : 1265 -1278 . DOI: 10.11900/0412.1961.2023.00392
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