Constitutive model and strengthening and ductility mechanisms of Ti6554 alloy with caliber rolled microstructure during cryogenic tension

doi:10.1007/s40436-025-00579-4

Advances in Manufacturing ›› 2026, Vol. 14 ›› Issue (3): 747-773.doi: 10.1007/s40436-025-00579-4

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Constitutive model and strengthening and ductility mechanisms of Ti6554 alloy with caliber rolled microstructure during cryogenic tension

Chuan Wu¹, Chuan-Kun Liu¹, Bao-Xi Liu²

1. National Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mold, Tianjin University of Technology and Education, Tianjin 300222, People's Republic of China;
2. Research Institute for Energy Equipment Materials, Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, People's Republic of China

Received:2025-06-24 Revised:2025-08-23 Accepted:2025-09-16 Online:2026-01-25 Published:2026-01-25
Contact: Chuan Wu,E-mail:zjkwuchuan@126.com E-mail:zjkwuchuan@126.com
Supported by:
The authors acknowledge with gratitude funding received from the National Natural Science Foundation of China (Grant Nos. 52475394, 52075386), and the Tianjin Natural Science Foundation of China-Multi-Input Key Projects (Grant No. 22JCZDJC00650).

Abstract

Abstract: To elucidate the cryogenic deformation behavior and its effect on microstructural evolution on the mechanical properties of titanium alloys, this study selects the Ti-6Cr-5Mo-5V-4Al (Ti6554) alloy as the research object, carrying out cryogenic tensile and impact tests, to obtain the stress strain curves and mechanical indicators and develop a modified Johnson Cook constitutive model. Scanning electron microscope (SEM), electron backscattered diffraction (EBSD) and transmission electron microscope (TEM) are utilized to analyze the morphological evolution, fracture mechanism, texture components, Schimidt factor (SF), and grain orientation spread (GOS). The results indicate that the {0001}<11-20> slip system remains activated for the α while these {110}<111>, {112}<111>, and {123}<111> systems remain the primary deforming components at lower temperatures. The increase of critical resolved shear stress (CRSS), extensive pile-up of dislocations, and geometrically necessary dislocations (GNDs) resulted from the inhomogeneous deformation can improve strength, while deterioration of ductility may be caused by the reduced number of activated slip systems and retarded dislocation mobility, incompatible deformation between the α and β phases, and dislocation accumulation and stress concentration. This work can provide a deep insight into understanding deformation behaviors and microstructural mechanism of Ti6554 alloy subjected to low-temperature tension.

The full text can be downloaded at https://doi.org/10.1007/s40436-025-00579-4

Key words: Cryogenic deformation, Ti6554 alloy, Strengthening, Deterioration of ductility, Modified Johnson Cook constitutive model

Chuan Wu, Chuan-Kun Liu, Bao-Xi Liu. Constitutive model and strengthening and ductility mechanisms of Ti6554 alloy with caliber rolled microstructure during cryogenic tension[J]. Advances in Manufacturing, 2026, 14(3): 747-773.

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URL: https://www.aim.shu.edu.cn/EN/10.1007/s40436-025-00579-4

https://www.aim.shu.edu.cn/EN/Y2026/V14/I3/747

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Constitutive model and strengthening and ductility mechanisms of Ti6554 alloy with caliber rolled microstructure during cryogenic tension

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