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- W4243833226 abstract "In order to understand micromechanisms offatigue crack growth in titanium aluminides, direct monitoring of the influence of the α2 and β phases on a growing crack was performed using an FEG SEM for Ti-23Al-9Nb-2Mo-1Zr-1.2Si (at.-%) and Ti-23Al-11Nb-0.9Si (at.-%) Ti3Al based alloys. Crack growth rates are observed to befaster across individual α2 laths than across β laths and/or along α2/β lath interfaces. It is found that fatigue cracks propagate incrementally through the α2 phase by decohesion of afavoured slip band rather than crossing it catastrophically in one cycle. The formation of intersecting slip bands can lead to a tortuous crack path and a decreased average crack growth rate in the α phase. When a crack meets the β phase, the most common phenomenon observed is crack deflection. The fatigue crack then extends continuously along α2/β interfaces under the effect of a mixed mode local stress intensity factor range. The basket weave microstructure achieves the maximum fatigue crack growth resistance from α2/β interfaces. Bridging and blunting can reduce fatigue crack growth rate remarkably. However, crack bridging happens only with larger β laths and blunting is mainly seen only for secondary cracks. The efficiency of bridging and blunting thus appears to depend on the ratio of load bearing capability of the β laths involved over the local effective ∆K range. Mechanisms operating during fatigue crack propagation are also compared with those observed during monotonic fracture." @default.
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- W4243833226 date "1998-03-01" @default.
- W4243833226 modified "2023-09-30" @default.
- W4243833226 title "Micromechanisms of fatigue crack propagation in Ti3AI based alloys" @default.
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- W4243833226 doi "https://doi.org/10.1179/026708398790301476" @default.
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