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Microstructural Evolution and Mechanical Behavior of SP-700Ti Alloy during Superplastic Deformation

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In this paper, the superplastic behavior of SP-700 alloy (Ti–4.5Al–3V–2Mo–2Fe) was investigated by hot compression tests and hot tensile tests in the temperature range of 700–950°C and strain rates of 0.001 to 1 s–1. The microstructural analysis and mechanical behavior of the alloy were studied during superplastic deformation. Although the elongation became higher than 370% at 700°C, the alloy showed a relatively high work hardening. At 750 and 800°C, the typical superplasticity was occurred and the specimens endured a large elongation of 427–440%. Microstructure of the alloy in 700–800°C was mainly consisted of globular α phase, while the globular α phase was completely removed in the tip fracture of the specimen deformed at 850°C due to deformation-induced transformation. In the temperature range of 850–950°C, the elongation was decreased to 250–325% as a consequence of the removal of α phase, significant β grain growth, and crack formation along β/β grain boundaries. The maximum elongation of 440% was obtained at 800°C where the strain-rate sensitivity is equal to 0.38 which is accommodated by the m-value distribution map of the alloy. During superplastic deformation in the single β phase region, the Rachinger grain boundary sliding (GBS) mechanism is the dominant phenomenon. However, deformation in the dual-phase α/β region is encouraged by dynamic recrystallization (DRX) and decomposition of α colonies.

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  1. Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, 193574521, Tehran, Iran

    M. Morakabati & Amir Hossein Sheikhali

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Morakabati, M., Sheikhali, A.H. Microstructural Evolution and Mechanical Behavior of SP-700Ti Alloy during Superplastic Deformation. Phys. Metals Metallogr. 124, 1579–1587 (2023). https://doi.org/10.1134/S0031918X2260213X

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