High Temperature Fatigue Behavior and Failure Mechanism of Ti-45Al-4Nb-1Mo-0.15B Alloy
Source abstract
Abstract
Strain-controlled low cycle fatigue experiments were carried out on the TiAl alloy Ti-45Al-4Nb-1Mo-0.15B at 400 °C and 750 °C to reveal the cyclic mechanical behavior and failure mechanism. The TiAl alloy presents stable cyclic characteristics under fatigue loading at elevated temperatures. No obvious cyclic softening or cyclic hardening was manifested during experiments. The cyclic stress–strain relationship is well described by the Ramberg–Osgood equation. The fatigue lifetime at different temperatures has a log-linear relationship with the total strain ranges. The fracture morphology indicates the main fracture mode of fatigue specimens at 400 °C is a brittle fracture, while there is a ductile fracture at 750 °C. Meanwhile, the trans-lamellar fracture is dominant for the lamellar microstructure and the percentages of the inter-lamellar fracture decreases with the strain amplitude.
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Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · MXene and MAX Phase Materials · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Hunan Aviation Powerplant Research Institute, Aero Engine (Group) Corporation of China, Zhuzhou 412002, China
Hunan Key Laboratory of Turbomachinery on Medium and Small Aero-Engine, Zhuzhou 412002, China
Institute of Engineering Thermophysics, Chinses Academy of Sciences, Beijing 100083, China
Institute for Aero Engine, Tsinghua University, Beijing 100084, China
Funding
Aviation Power Foundation · Natural Science Foundation of Hunan Province, China
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