Ravichandran, KS and Dwarakadasa, ES and Banerjee, D (1991) Mechanisms of cleavage during fatigue crack growth in $Ti-6Al-4V$ alloy. In: Scripta Metallurgica et Materialia, 25 (9). pp. 2115-2120.
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Beta processed microstructures of titanium alloys consisting of Widmanstatten structures offer attractive combinations of strength, fracture toughness and resistance to fatigue crack growth (FCG) for damage-tolerance applications [1-3]. This is generally attributed to large prior beta grain sizes incorporating coarse lamellar colonies across the boundaries of which cracks are deflected or deviated . FCG resistance of these microstructures is far superior that of other microstructures owing to increased levels of crack deflection or deviation causing an increase in the intrinsic crack growth resistance, $\Delta K_e_f_f_,_t_h$, as well as crack closure . However, the fatigue crack initiation resistance is lowfor these structures due to the formation of large intense planar slip bands. Growth of fatigue cracks along these bands normal to $\alpha/\beta$ interfaces is easy without interruption at the interfaces and this has been largely attributed  to the poor fatigue crack initiation characteristics, tn the present study, some important and unusual fracture features pertaining to the effect of $\beta$ phase in retarding cleavage cracks produced during fatigue crack growth are presented. The factors responsible for these effects are highlighted.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Department/Centre:||Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)|
|Date Deposited:||26 Jun 2007|
|Last Modified:||17 Jan 2012 05:35|
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