Damage tolerant microstructure for lamellar alloys
AssigneeUnited Technologies Corporation
InventorDaniel P. DeLuca
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Abstract
A damage tolerant microstructure for a lamellar alloy, such as a lamellar γTiAl alloy, is provided in accordance with the present invention. The alloy comprises a matrix and a plurality of grains or lamellar colonies, a portion of which exhibit a nonplanar morphology within said matrix. Each of the lamellar colonies contains a multitude of lamella with irregularly repeating order. The γTiAl platelets have a triangular (octahedral) unit cell and stack with γ twins. The α2Ti3Al platelets are irregularly interspersed. The unit cell for α2Ti3Al is hexagonal. Each of the layers has a curved, nonplanar structure for resisting crack formation and growth.
Claims12
A lamellar γTiAl alloy having a microstructure with a plurality of lamellar colonies having a nonplanar morphology.
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Dependencies are inferred from the claim text.