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Titanium occurs in two structures; a high temperature body-centered cubic structure which is known as β phase and an ambient temperature α phase which has the hexagonal closed-packed structure. In the present study a biomedical Ti 6Al 7Nb alloy was investigated. The so-called duplex structure consisting of α lamellae and equiaxed primary α-grains was prepared by a thermal treatment. The α lamellae are created during cooling from a βeld according to the Burgers relation. This relation allows the formation of the α lamellae with di erent crystallographic orientations so-called variants. The preferential misorientation between α lamellae was studied by a detailed electron backscattered di raction analysis. The misorientation of grains in the duplex structure was modelled by a sum of random Mackenzie distribution and Gaussian peaks related to the preferred misorientations according to the Burgers relation. The preferred misorientations based on the Burgers relationship were identi ed in the biomedical Ti 6Al 7Nb alloy with duplex structure. It is con rmed that the variant selection of α lamellae is not random.

Alpha Variant Selection Determined from Grain Misorientations in Ti-6Al-7Nb Alloy with a Duplex Microstructure