Evolution of Lamellar O Phase During Hot Compression in Ti_2AlNb-Based Alloy

Dong Li; Wei-Dong Zeng; Hao-Yuan MaJian-Wei XuXiao-Bo Liang

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Evolution of Lamellar O Phase During Hot Compression in Ti_2AlNb-Based Alloy

机译：Evolution of Lamellar O Phase During Hot Compression in Ti_2AlNb-Based Alloy

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The dynamic spheroidization behavior of Ti_2AINb-based alloy with O lamellae during isothermal hot compression was investigated. The aspect ratio of lamellar O phase decreased at higher compression temperatures and lower strain rates, and more kinked or spherical O phases appeared. The results indicated that deformation conditions have a considerable effect on dynamic spheroidization behavior of Ti-22AI-25Nb alloy, and the correlation between spheroidization fraction and strain follows a Avrami-type sigmoid model. The strains for starting (ε_c) and finishing (ε_f) of the dynamic spheroidization determined with the nonlinear fit were 0.10-0.31 and 1.70-5.39, respectively. The ε_c was higher due to the consumption of compressed strains before the fracture of O lamellae. The kinetic rate of dynamic spheroidization is positively correlated with temperature rise and negatively correlated with strain rate. Dynamic spheroidization was achieved through a combination of shearing and diffusional process during different hot compression conditions.

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来源
《Science of advanced materials》 |2022年第4期|682-689|共8页
作者
Dong Li; Wei-Dong Zeng; Hao-Yuan MaJian-Wei XuXiao-Bo Liang;
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作者单位

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China, Defense Technologies Innovation Center of Precision Forging and Ring Rolling, School of Materials Science and Engineering, Northwestern Polytec;

High Temperature Materials Research Institute, Central Iron and Steel Research Institute, Beijing, 100081, China;

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正文语种英语
中图分类工程材料学;
关键词
Ti_2AlNb-Based Alloy; (O + B2) Microstructure; Hot Deformation; Microstructural Characterization; Dynamic Spheroidization Behavior;

Evolution of Lamellar O Phase During Hot Compression in Ti_2AlNb-Based Alloy

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