Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 816, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141291
Keywords
Selective laser melting; Titanium alloy; Microstructure; Tensile properties; Deformation mechanism
Categories
Funding
- National Key Research and Development Program of China from the Ministry of Science and Technology of the People's Republic of China [2018YFB0703400]
- China's 1000YouthTalent Plan
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A beta titanium alloy, Ti-10V-2Fe-3Al, was processed by pulsed selective laser melting to fabricate samples with high strength and ductility. Dislocation slipping was identified as the dominant deformation mechanism during tensile testing, with the high yield strength attributed to the suppression of transformation and the fine grain and cell structures.
A beta titanium alloy, Ti-10V-2Fe-3Al, was processed by pulsed selective laser melting. The as-fabricated sample was dominated by fibre-like columnar beta grains and cellular structures which were embedded with a high density of nano-sized omega precipitates and dislocations. The samples demonstrated extraordinarily high yield strength (920-950 MPa) and high elongation (10-14%). After yielding, the samples showed nearly constant true stresses but changeable work hardening rates. Electron backscattered diffraction and transmission electron microscopy study on the deformed samples revealed that dislocation slipping has been the dominant deformation mechanism during tensile testing, which was accompanied by beta ->alpha ' martensitic transformation. The significantly high yield strength is attributed to the suppression of beta ->alpha '' transformation and the fine grain and cell structures together with massive pre-existing dislocations. The abnormal increase in work hardening rate between 2.2% and 6% true strain is mainly attributed to the increased occurrence of stress induced beta -> alpha ' martensitic transformation.
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