The role of β phase in the morphology evolution of α lamellae in a dual-phase titanium alloy during high temperature compression

Pang, Haoyu; Luo, Jiao; Liu, Cong; Li, Miaoquan

doi:10.1016/j.jallcom.2022.164901

Cited by 3 publications

(2 citation statements)

References 43 publications

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“…The process of boundary splitting is controlled by atom migration and phase transformation. Pang et al [ 38 ] indicated that the process of boundary splitting could be described as β stabilized elements diffusing to α/α sub-boundaries, α/α sub-boundaries transforming into β (matrix) phase, and the α phase separating along the α/α sub-boundaries. Sharma et al [ 39 ] studied the mass transport rate for the boundary-splitting mechanisms based on Ti-47Al alloy, and the results indicated that higher heat treatment temperature was beneficial for mass transport.…”

Section: Resultsmentioning

confidence: 99%

Static Globularization Behavior and Artificial Neural Network Modeling during Post-Annealing of Wedge-Shaped Hot-Rolled Ti-55511 Alloy

Shi

Kong³

et al. 2023

Materials

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The globularization of the lamellar α phase by thermomechanical processing and subsequent annealing contributes to achieving the well-balanced strength and plasticity of titanium alloys. A high-throughput experimental method, wedge-shaped hot-rolling, was designed to obtain samples with gradient true strain distribution of 0~1.10. The samples with gradient strain distribution were annealed to obtain the gradient distribution of globularized α phase, which could rapidly assess the globularization fraction of α phase under different conditions. The static globularization behavior under various parameters was systematically studied. The applied prestrain provided the necessary driving force for static globularization during annealing. The substructure evolution and the boundary splitting occurred mainly at the early stage of annealing. The termination migration and the Ostwald ripening were dominant in the prolonged annealing. A backpropagation artificial neural network (BP-ANN) model for static globularization was developed, which coupled the factors of prestrain, annealing temperature, and annealing time. The average absolute relative errors (AARE) for the training and validation set are 3.17% and 3.22%, respectively. Further sensitivity analysis of the factors shows that the order of relative importance for static globularization is annealing temperature, prestrain and annealing time. The developed BP-ANN can precisely predict the static globularization kinetic curves without overfitting.

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Section: Resultsmentioning

confidence: 99%

Static Globularization Behavior and Artificial Neural Network Modeling during Post-Annealing of Wedge-Shaped Hot-Rolled Ti-55511 Alloy

Shi

Kong³

et al. 2023

Materials

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“…[1][2][3][4][5][6] Two-phase titanium alloys, such as Ti-6Al-4 V, Ti-6.5Al-2Zr-1Mo-1 V, and Ti-5Al-2Sn-2Zr-4Mo-4Cr, are mainly composed of low-temperature stable α phase and hightemperature stable β phase. [7] Ti-6Al-2Sn-4Zr-6Mo (Ti6246) is also a typical α þ β two-phase titanium alloy, which was developed in the United States in the 20th century by modifying the Ti-6Al-2Sn-4Zr-2Mo alloy. [8] The thermomechanical processing of dual-phase titanium alloys can be conducted in the single-phase or dual-phase region, in which the dual-phase region processing, including deformation and heat treatment, can effectively change the morphology and crystal orientation of the alloy microstructures.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Recrystallization of Ti6246 Alloy in Hot‐Rolling and Annealing Processes

Lu,

Xue,

Fan

et al. 2023

Adv Eng Mater

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In this study, the Ti‐6Al‐2Sn‐4Zr‐6Mo (Ti6246) casted alloy was treated with two different hot rolling processes (3‐pass and 5‐pass), and the as‐rolled alloy was subsequently annealed at different temperatures (780 and 850 °C). During hot rolling, obvious changes in the morphology and microstructure of the Ti6246 alloy occurred. A large number of dislocations were generated in the rolling process, and their movement plays an important role in the microstructure evolution of the alloy. The 3‐pass hot rolling resulted in smaller grain size (0.43 μm) than that of the 5‐pass rolled sample (0.68 μm), which could be attributed to the larger deformation degree of the single pass in the 3‐pass rolling process. However, the larger deformation of the 3‐pass rolling led to higher dislocation density (34.29% of LM above 1) and more microstructure defects in the Ti6246 alloy, which further resulted in easier initiation of the prismatic and pyramidal slips of the alloy. The 5‐pass procedure can provide more deformation passes to promote the DRX of the Ti6246 alloy and the fraction of DRX can reach 33.27%. On the other hand, with the increase in the annealing temperature, the degree of recrystallization increased and the number of microstructure defects decreased.This article is protected by copyright. All rights reserved.

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Phase/grain boundary assisted-3D static globularization mechanism of TC17 alloy based on the microstructure reconstruction and in-situ TEM observation

Pang¹,

Liu²,

Luo³

et al. 2023

Journal of Materials Science & Technology

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The role of β phase in the morphology evolution of α lamellae in a dual-phase titanium alloy during high temperature compression

Cited by 3 publications

References 43 publications

Static Globularization Behavior and Artificial Neural Network Modeling during Post-Annealing of Wedge-Shaped Hot-Rolled Ti-55511 Alloy

Static Globularization Behavior and Artificial Neural Network Modeling during Post-Annealing of Wedge-Shaped Hot-Rolled Ti-55511 Alloy

Microstructure Evolution and Recrystallization of Ti6246 Alloy in Hot‐Rolling and Annealing Processes

Phase/grain boundary assisted-3D static globularization mechanism of TC17 alloy based on the microstructure reconstruction and in-situ TEM observation

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