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# Fatigue crack growth transitions in Ti-6Al-4V alloy

Ravichandran, KS and Dwarakadasa, ES (1989) Fatigue crack growth transitions in Ti-6Al-4V alloy. In: Scripta Metallurgica, 23 (10). pp. 1685-1690.

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## Abstract

There are 2 transitions during fatigue crack growth in Ti-6Al-4V alloy, caused by cyclic and monotonic plastic zones when their resp. sizes become equal to the $\alpha$ lath size. The transition due to cyclic plastic zone size is a combined action of environment and the stage where cyclic plastic zone size becomes equal to lath size. Crack closure levels exhibited a transition. The crack path exhibited multiple crack branching at this transition. The cyclic plastic zone size is uniquely related with $\delta$Keff (closure-free stress intensity range) as against $\delta$K at large crack closure. A transition occurred when the monotonic plastic zone size was equal to the $\alpha$ lath size, and this is attributed to the change from continuum to single crystal behavior at the crack tip. Both the transitions were induced by $\alpha$ laths because of thick interplatelet $\beta$ layer in the microstructure.

Item Type: Journal Article http://dx.doi.org/10.1016/0036-9748(89)9... Copyright of this article belongs to Pergamon Press plc. Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) 25 Feb 2008 19 Sep 2010 04:42 http://eprints.iisc.ernet.in/id/eprint/12834

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