High-temperature torsion induced gradient microstructures in high Nb-TiAl alloy
High-temperature torsion induced gradient microstructures in high Nb-TiAl alloy
复制标题
高 Nb-TiAl 合金的高温扭转诱导梯度显微组织
DOI:
10.1016/j.matlet.2017.07.124
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发表时间:
2017-12
影响因子:
3
通讯作者:
Liang Yongfeng
中科院分区:
文献类型:
--
作者:
Ding Jie;Lin Junpin;Zhang Minghe;Dong Chengli;Liang Yongfeng
The high temperature torsion deformation of a duplex microstructure high Nb-TiAl alloy was investigated at 850 °C. The experimental results showed that the hardness and the density of twins increased with radial distance from the center to rim of 180° torsion sample. Besides, the “recrystallized”, “substructured” and “deformed” microstructures were also presented gradient and forming sub-grains was the transition stage between recrystallization and deformation. Moreover, γ grain recrystallization at twin-twin junctions occurred and the observation of dislocation-twin interactions revealed the formation of secondary twins by dissociating of the dislocation at twin-twin boundary. The dissociation of such dislocations interacting with twin boundaries and γ grain recrystallizations at twin-twin boundaries avoided excessive stress concentration, which allowed the alloy to continue plastic deformation.
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