Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 805, Issue -, Pages 1144-1160Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.07.134
Keywords
Ti-5Al-5Mo-5V-3Cr-1Zr titanium alloy; Solution plus aging treatment; Microstructural evolution; Mechanical properties; Fracture mechanism
Categories
Funding
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201853]
- Scientific Research Foundation of Tianjin University of Technology and Education [KYQD1801]
- National Science Fund for Distinguished Young Scholars of China [51625505]
- Key Program Project of the Joint Fund of Astronomy and National Natural Science Foundation of China [U1537203]
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Ti-55531 (Ti-5Al-5Mo-5V-3Cr-1Zr) is near beta titanium alloy, which plays a significant role in manufacturing landing gears and flap tracks in the aerospace industry. This study aims to find out an optimal heat treatment to obtain an excellent balance of strength, ductility and fracture toughness. For this purpose, the Ti-55531 alloy was subjected to solution plus aging treatments and mechanical properties tests. Optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM) were adopted to observe the microstructural evolution including morphology, distribution and size. Standard tensile and compact tension (CT) tests were carried out to obtain the yielding/tensile strength (YS, TS), elongation (EL) and fracture toughness (K-IC) of Ti-55531 alloy. The effects of solution temperature, aging temperature and time on the microstructural evolution and fractography were analyzed. The relationships between the mechanical properties and microstructures were qualitatively described. The influencing mechanism of plastic deformation and crack propagation path on the K-IC were discussed. Simultaneously, the values of YS and K-IC were predicted based on mechanical property models, the predicted values were compared with tested data. Finally, an optimal heat treatment was proposed for the Ti-55531 alloy, to obtain a good balance of strength, ductility and fracture toughness. (C) 2019 Elsevier B.V. All rights reserved.
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