Abstract
Creep constrained grain boundary cavitation in a fully lamellar (FL) form of a titanium aluminide intermetallic alloy has been studied using finite element (FE) techniques. Two different forms of FL models were considered. Cavitation was modeled in the presence of grain boundary sliding (GBS) for the case of straight former γ grain boundaries. Models of cavitation without GBS were also performed for a FL microstructure with serrated forme γ grain boundaries. The effect of cavitating facet interaction on rupture life has been studied. A comparison between the FL forms and a dual-phase equizxed microstructure having the same phase ratio (α2/γ) was also made to examine the relative susceptibility of these microstructures to high-temperature damage. It has been observed that the overall effect of interaction between cavitating facets increases the rupture time significantly when these facets are on adjacent grains. However, in the presence of GBS, cavitation on the facet with narrower separation effectively reduces the cavity growth rate on the facet with wider separation.
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