Abstract
In this study, we focused on the effect of lamellar orientation on the fracture behaviors of Ti-48Al-2Cr-2Nb (at.%) polysynthetically twinned crystals. The results show that the oriented angle that is between the initial crack plane and lamellar plane performs a crucial role in the fracture resistance of the studied crystal. The fracture toughness increases with the increased oriented angle, and the fracture behavior changes from interlamellar to translamellar; the toughening mechanism also changes correspondingly. Furthermore, schematic models are used to illustrate the relevant toughness mechanism in this article.
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