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Abstract
Tensile deformation behaviour in NbSi 2 and MoSi 2 single crystals with the C40 and C11 b structure, respectively, was examined in a temperature range up to 1500 °C and compared with that under compression, focusing on the temperature dependence of the critical resolved shear stress (CRSS), elongation/fracture strain and crack initiation process. Two different types (Type A and Type B) of geometry of NbSi 2 tensile specimens were used to evaluate elongation and fracture behaviour. No difference in the CRSS for the 0001 2 1 ̄ 1 ̄ 0 slip of NbSi 2 and that for the {011)<100] slip in MoSi 2 was found in both modes of tension and compression. In contrast, the ductile-brittle transition temperature (DBTT) depended strongly on the loading mode and the type of geometry. Elongation and process for crack initiation in NbSi 2 changed remarkably depending on the deformation temperature. Four new slip systems of 10 1 ̄ 0 1 3 1 2 ̄ 10 , 10 1 ̄ 1 1 3 1 2 ̄ 10 , 10 1 ̄ 0 0001 and 11 2 ̄ Y 112X (X×Y=−6 ) were found near the crack path in NbSi 2 deformed at 1000 °C.
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