Abstract
This letter reports the line tension of 1/2<110] screw dislocations on cross-slip planes calculated for gamma-TiAl. The results show that the line tension is highly anisotropic on the cross-slip planes, with a maximum on the (001) plane and a minimum on {110} planes. The line tension on the primary glide plane {111} is intermediate. Three sets of elastic constants were used to calculate the line tension. The ratio of maximum to minimum line tensions ranges from 2.19 to 2.84. Screw 1/2<110] dislocations do not possess a negative line tension, which rules out the possibility of cross-slip caused by elastic instability. The role of line tension anisotropy in driving the cross-slip of screw dislocations is discussed.
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