| Phase Transformation in a β-Ti Alloy with Good Balance Between High Strength and High Fracture Toughness |
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| 作者单位： | Li Yang,Wei Qiang,Ma Chaoli,Zheng Lijing,Li Huanxi(School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China);Ge Peng,Zhao Yongqing(Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China) |
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| 基金项目： | National Basic Research Program of China |
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| 摘 要： |
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| 收稿时间： | 2008-09-25 |
Phase Transformation in a β-Ti Alloy with Good Balance Between High Strength and High Fracture Toughness |
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| Li Yang,Wei Qiang,Ma Chaoli,Zheng Lijing,Li Huanxi,Ge Peng,Zhao Yongqing. Phase Transformation in a β-Ti Alloy with Good Balance Between High Strength and High Fracture Toughness[J]. Chinese Journal of Aeronautics, 2009, 22(5): 535-539. DOI: 10.1016/S1000-9361(08)60137-5 |
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| Authors: | Li Yang Wei Qiang Ma Chaoli Zheng Lijing Li Huanxi Ge Peng Zhao Yongqing |
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| Affiliation: | 1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;2. Northwest Institute for Nonferrous Metal Research, Xi''an 710016, China |
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| Abstract: | This article studies the phase transformation of the metastable β-Ti-Al-Mo-V-Cr-Zr alloy (Ti-1300) to disclose the morphological reason for its high strength and high fracture toughness. It has been found that its ultrahigh strength (ultimate tensile strength exceeds 1 400 MPa) owes mainly to the spheroidization of the α-phase, while the high fracture toughness (exceeds 81 MPa·m½) to the special lath-shaped α-particles. Compared to the needle-shaped second α-articles, the coarser lath-shaped ones remove the stress concentration at the lath tips and consequently benefit improvement of fracture toughness. The article also describes shape evolution of the α-particles during aging thermodynamically and kinetically, and suggests an optimized aging processing to achieve an ideal balance between high strength and high toughness for this alloy. |
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| Keywords: | Ti-1300 titanium alloys strength of materials fracture toughness |
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