Plastic deformation of Ni2AlTi

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Abstract
Single-crystal and polycrystalline specimens of the intermetallic compound Ni2AlTi with the L21 structure have been deformed in compression at 923–1283 K. At temperatures higher than ∼965 K, specimens deform by slip along ⟨110⟨ directions. The observed slip planes vary with crystal orientation and, in general, they are indexed to be the high-index {hℏk} planes. However, the fundamental slip planes on which dislocations move are of the {110}, {001} and possibly {112} types. The critical resolved shear stress (CRSS) is lowest for the {110} ⟨110⟩ system and highest for the {001}⟨110⟩ system. The CRSS for these slip systems exhibits a strong temperature-dependence. Dislocation structures on the slip plane of the most predominant slip system have been studied as a function of the deformation temperature and crystal orientation. The most characteristic feature of the dislocation structure in Ni2AlTi is the occurrence of numerous dislocation nodes and networks. This has been discussed in term of the elastic energy of 1/2⟨110⟩ dislocations and their reaction.

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