Abstract
The mechanical properties of TiAl alloys depend significantly on the microstructure. Introducing duplex microstructure (DM) has improved ambient tensile plasticity and strength of TiAl alloys. To reveal the fracture micromechanism and the function of Lamellar colonies in the process of deformation, detailed fractography and cleavage crystallography are needed. Etch pitting is an efficient method to identify the crystalline features of fracture surfaces, since the shape of etch pits formed on the fracture surface depends on the orientation of the fracture facets and the orientation of the etch pit faces. The relationship between the morphologies of the fracture surface and the orientation of fracture facets in the microstructure can be determined through SEM observation of the fracture surface being etch pitted. The objective of this article is to present the results of a fractographic investigation on tensile fracture surfaces of a DM TiAl alloy through SEM observation and etch pitting technique.
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