Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 840, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.142997
Keywords
Metastable beta titanium alloys; alpha precipitates; Thermomechanical processing; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [52105211]
- Natural Science Foundation of Shaanxi Province, China [2021JQ-109]
- Open Fund of Liaoning Provin-cial Key Laboratory of Aero-engine Materials tribology [LKLAMTF202203]
- Fundamental Research Funds for the Central Universities of China [3102019JC001]
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An optimized thermomechanical processing method was used to treat β titanium alloy, resulting in a fine equiaxed microstructure with a mean size of 160 nm and significantly enhanced yield strength.
An efficient and simple thermomechanical processing is particularly important to obtain homogenous microstructures. In this work, an optimized thermomechanical processing consisting of multiple isothermal compression processing and stress relaxation processing was conducted on a metastable beta titanium alloy (Ti-5Al-5Mo-5V-3Cr-0.5Fe). The sample geometry after designed thermomechanical processing maintain the same with the geometry after an unidirectional compression, but with totally different microstructures. The results show that a fully fine equiaxed microstructure with the mean size of 160 nm is obtained after the designed processing. Such fine microstructure has not been reported previously in titanium alloys processed by conventional isothermal compression and annealing. In addition, the yield strength of the sample after designed processing was significantly enhanced. The mobile dislocation slipping and stacking faults induced shear are the main mechanisms behind stress relaxation stage in thermomechanical processing. This work can provide an effectively novel thermomechanical processing to optimize the mechanical properties.
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