Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 772, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138687
Keywords
Metastable titanium alloy; omega precipitation; Phase stability; Deformation mechanism; Modulated structure
Categories
Funding
- National Natural Science Foundation of China [51671031]
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The deformation mechanism of a binary metastable titanium alloy Ti-15Mo that had been subjected to various heat treatment regimes was investigated in this work. Microstructures and diffuse streaks were revealed using electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM). The evolution of the deformation mechanisms were identified as being from primary and secondary {332} twinning -> {332} twinning + {112} twinning -> {332} twinning + {112} twinning + dislocation slips -> dislocation slips with varying initial microstructures. The diffuse streaks corresponding to the soft-phonon shuffling along the (110)< 110 >(beta) direction were caused by the substitutional Mo atoms and their local strain fields. These nano-sized modulated structures were strongly influenced by phase stability and also proved to serve as a critical factor in deformation mechanisms of this material. Meanwhile, the preferential growth of a nano-sized modulated structure variant took place and was studied to highlight the relationship between loading direction and grain orientation.
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