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| Microstructure and Mechanical Property of Superplastic Deformed Ti–4.5Al–3V–2Fe–2Mo Alloy Sheet |
| FU Mingjie 1,2,3, ZENG Yuansong 1,2,3, HAN Xiuquan 1,2,3, LÜ Fenggong 1,2,3, WANG Fuxin 1,2,3 |
| (1. AVIC Manufacturing Technology Institute, Beijing 100024, China; 2. Aeronautical Key Laboratory for Plastic Forming Technology, Beijing 100024, China; 3. Key Laboratory of Digital Plasticity Forming Technology and Equipment, Beijing 100024, China ) |
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Abstract The superplasticity of Ti–4.5Al–3V–2Fe–2Mo alloy (SP700 alloy) was studied by the methods of maxium m value and constant rate under the conditions of 755~785℃ , 0.1~0.005s–1 and different tensile axis direction. Typical parts were formed and RT properties after superplastic forming were evaluated. The results showed SP700 alloy has excellent low temperature superplasticity with 3110% elongation at 775℃ and 45° direction with max m value tensile method. The capacity of anti-neck-shrink increased due to strain induced grains growing. The cone shape part formed at 755℃ with the highest height of 100mm under bidirectional pull stress condition, and microstructure has no significant change. RT properties of the sample with 33% deformation are 1027MPa ultrastrength and 16.8% elongation, which are little higher than those of undeformed specimens.
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2021, 
