Abstract
The deformation behavior of Ti 5 Si 3 single crystals with the hexagonal D8 8 structure has been investigated in compression as a function of crystal orientation in a temperature range from 1200 to 1500 °C. Three different types of deformation modes – { 1 1 ¯ 0 0 }[0 0 0 1] prismatic slip, { 2 1 ¯ 1 ¯ 2 }1/3〈 2 1 ¯ 1 ¯ 3 ¯ 〉 pyramidal slip and { 2 1 ¯ 1 ¯ 8 }〈 8 4 ¯ 4 ¯ 3 ¯ 〉 twinning – were identified for the first time as being operative in Ti 5 Si 3 at temperatures above 1300 °C, depending on the loading axis orientation. The critical resolved shear stresses (CRSSs) decrease steeply with increasing temperature for all deformation modes. The values of the CRSSs for { 1 1 ¯ 0 0 }[0 0 0 1] prismatic slip are considerably lower than those for { 2 1 ¯ 1 ¯ 2 }1/3〈 2 1 ¯ 1 ¯ 3 ¯ 〉 pyramidal slip, but are comparable to those for { 2 1 ¯ 1 ¯ 8 }〈 8 4 ¯ 4 ¯ 3 ¯ 〉 twinning. The favored deformation modes are discussed on the basis of anisotropic elasticity theory of dislocations.
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