MATEC Web Conf.
Volume 321, 2020The 14th World Conference on Titanium (Ti 2019)
|Number of page(s)||9|
|Section||Microstructure - Properties Relationships|
|Published online||12 October 2020|
Microstructures and tensile properties of a high strength β titanium alloy Ti5Al4Zr8Mo7V by near β forging and β-transus forging
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, P. R. China
A novel high-strength metastable β-Ti alloy Ti-5Al-4Zr-8Mo-7V has been successfully developed by improved Bo-Md map combined with critical Mo equivalent criteria. Near β forging combined with different heat treatments was introduced to tailor the Bi-modal structure. The alloy exhibits good strength-ductility combination with UTS~1390 MPa and El~10% after solution treated (ST) at 800°C followed by 570°C aging. After β-transus forging combined with subsequent heat treatment, an excellent combination of strength UTS~1460MPa and El~10% is achieved which is attributed to the Tri-modal structure consisting of primary α (αp), sub-micro α rods (αr) and nano-scale α platelets (αs). Plastic strain is effectively partitioned in both αp, αr and β matrix during deformation, which results in a more homogeneously strain distribution and improved ductility. Nano-scale distribution of αs effectively block the dislocation motion in β matrix and strengthen the alloy.
Key words: high strength b-Ti alloy / Bo-Md map / microstructure tailoring / tensile property
© The Authors, published by EDP Sciences, 2020
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