Cyclic deformation mechanism of a high-Nb TiAl alloy at high temperatureChinese Full Text
ZHANG Min;LI Hong-liang;SONG Xi-ping;YU Long;JIAO Ze-hui;YU Hui-chen;State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing;Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials;
Abstract: Tension and cyclic deformation tests of a nearly lamellar Ti-45Al-8Nb-0. 2W-0. 2B-0. 1Y alloy were carried out at 750℃,and the corresponding microstructures were examined by scanning electron microscopy（ SEM） and transmission electron microscopy（ TEM）. It is found that the cyclic stress-strain curve of the alloy at 750 ℃ is above the static tensile curve,indicating an obvious cyclic hardening characteristic of the alloy at 750 ℃; the cyclic stress-strain behavior of the alloy is characterized by first hardening and then stabilization. TEM observations show that there are lots of dislocation pile-ups,pinnings and tanglings in cyclic deformation and tensile specimens,but large amounts of mechanical twinnings only occur in the former,implying that twinnings play a considerable role in the cyclic deformation process of the alloy at 750 ℃.
Keywords：
titanium aluminum alloys; niobium; high temperature; cyclic deformation; fatigue of materials; stress-strain behavior; dislocations;
- DOI：
10.13374/j.issn1001-053x.2014.07.010
- Series：
- Subject：
- Classification Code：
TG146.23
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