Effect of grain size on twinning behavior in Ti–2Al–2.5Zr alloy fatigued at 77K
作者： H. Wang , Q.Y. Sun , L. Xiao , J. Sun
DOI: 10.1016/J.MSEA.2012.01.106
关键词: Deformation (engineering) 、 Stress concentration 、 Alloy 、 Composite material 、 Crystal twinning 、 Stacking 、 Deformation mechanism 、 Materials science 、 Grain size 、 Ribbon 、 Metallurgy
摘要: Abstract The low-cycle fatigue (LCF) behavior and plastic deformation mechanism were studied in Ti–2Al–2.5Zr alloy with different grain sizes of 5, 40, 100 μm fatigued at 77 K. results show that LCF life decreases as size increases. Microstructural observation transmission electron microscopy (TEM) reveals the structure evolves from twins to stacking faults Deformation twinning is prevalent 5 μm fine-grained sample. However, well-defined fringes observed occur inside twins, which separated by ribbon coarse-grained samples 40 100 μm. This type has an implication for activating extended dislocations during cyclic deformation. mode transition could be attributed growing localized stress concentration increasing size.
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