Damage tolerant microstructure for lamellar alloys

Details Damage tolerant microstructure for lamellar alloys Damage tolerant microstructure for lamellar alloys

2005-12-13

2005-12-13

King, Roy (Department: 1742)

Metal treatment

Stock

Titanium, zirconium, or hafnium base

C420S418000, C420S420000, C420S421000, C148S669000, C148S670000, C148S671000

Reexamination Certificate

active

06974507

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.

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D. Zhang et al., “Characterization of Controlled Microstructures in a y-TiA(Cr, Mo, Si, B) Alloy”, Intermetallics, (1999), vol. 7, No. 10, pp. 1081-1087, Elsevier Science Publishers B.V. GB.

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