期刊
PHILOSOPHICAL MAGAZINE LETTERS
卷 95, 期 2, 页码 85-91出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500839.2015.1009515
关键词
titanium aluminide; nanoindentation; transmission electron microscopy; long-period stacking ordered structure
类别
资金
- National Basic Research Program of China (973 Program) [2011CB605501]
- National Natural Science Foundation of China [51171015, U1204508]
- Beijing Natural Science Foundation [2122043]
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing [2012Z-06]
- National Science Foundation of the United States [CMMI-1333999]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1333999] Funding Source: National Science Foundation
Microstructure and deformation mechanisms at a nanoindentation in the lamellar colony of high Nb containing TiAl alloy have been studied using the focused ion beam and the transmission electron microscopy. Considerable deformation twins are observed around the nanoindentation, and a strain gradient is generated. A continuous change in the bending angle of the lamellar structure can be derived, and a strain-induced grain refinement process is observed as various active deformations split the gamma grains into subgrains. In addition to all possible deformation mechanisms (ordinary dislocation, super-dislocation and deformation twining) activated due to the heavy plastic deformation, a 6-layer hexagonal (6H) long-period stacking ordered structure is identified for the first time near the contact zone and is thought to be closely related to the glide of partial dislocations.
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