Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 708, Issue -, Pages 574-581Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.10.028
Keywords
Titanium alloy; In situ SEM; Slip system; Schmid factor
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Funding
- National Key Research and Development Plan [2016YFB0301200]
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In this study, the deformation behavior of a near-beta Ti-17 titanium alloy under uniaxial tension was investigated using electron backscatter diffraction (EBSD) and tensile tests with in situ scanning electron microscope (SEM) observation. It is found slip mode is the main deformation mechanism in primary alpha grains of Ti-17 during the tensile test. Slip systems activated were identified by performing calculations on EBSD orientation data. The results show that all the three slip systems with a-type Burgers vector, i.e. basal, prism and 1st-order pyramidal slip, could be activated in the primary alpha grains of Ti-17, but no a + c-type slip (2nd-order pyramidal slip) activated is observed. Analysis reveals that basal and prism slips are the dominating slip mode, while 1st-order pyramidal slip acts as a subsidiary or deviated slipping mode. For the equivalent slip systems, Schmid factor dominates the slip behavior, while for the non-equivalent slip systems, critical resolved shear stress (CRSS) must be taken into account. It is proved that CRSS for a + c-type slip is much larger than that for a-type slips (basal and prism slips) in Ti-17 alloy (at least 2.5 times that for basal slip). a-type slip remains the easiest slip to be activated even in the condition favoring a + c-type slip and suppressing a-type slip (an angle of similar to 10 degrees between the tensile axis and c-axis).
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