Diffusional transformation in Ti6Al4V alloy during isothermal compression |
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| Affiliation: | 1. Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa;2. Department of Materials Science and Metallurgical Engineering, University of Pretoria, Pretoria 0001, South Africa;1. School of Metallurgical and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China;2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China;3. School of Materials Science and Engineering, Hunan University, Changsha 422004, China;1. Institute of Materials Processing and Intelligent Manufacturing, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;2. Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China;1. Light Alloy Research Institute, Central South University, Changsha 410083, China;2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;3. State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China;4. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;1. Institute of Frontier Materials, Deakin University, Geelong, Australia;2. School of Engineering, Deakin University, Geelong, Australia;3. Kalyani Center for Technology and Innovation, Bharat Forge Ltd., Pune, India |
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| Abstract: | Thermodynamic calculation of the two-phase Ti alloy was completed using CompuTherm Pandat™ and Ti data base, followed by isothermal compression of Ti6Al4V (Grade 5), with an initial colony lamellar structure that was performed in the (α+β) and β-phase field. Microstructural evolution and phase transformation were investigated using X-ray diffraction, scanning and transmission electron microscopy. The presence of the Ti3Al or α2 (hcp), the phase stability and transition temperatures were predicted by the Gibbs free energy−temperature and phase fraction−temperature diagrams. The isothermal compression in the (α+β)-phase field is characterized by reorientation and localized kinking of α/β lamellae, and cracking at α/β interphase regions. While in the α→β-phase transformation area, deformation in β-phase and at α/β interphase boundaries, extensive transformation of α into β-phase, martensitic transformation and spheroidization of α-laths mainly characterize this isothermal compression. A complete transformation of α into β single phase occurs in the β-phase field. Ti3Al or α2 (hcp), β (bcc) and α (hcp)-phase, and additional hcp α' and orthorhombic α” phases in a deformed Ti6Al4V are revealed. The flow stress level, the dynamic recovery and dynamic globularization are affected by deformation temperature. |
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| Keywords: | Ti6Al4V phase transformation spheroidization thermodynamic calculation |
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