Abstract
The 1/2〈331] dislocations in the tetragonal C11b structure of disilicides may possess a threefold non-planar core structure inherited from the BCC lattice. Due to non-metallic bonding, the dislocation splitting is intrinsically asymmetrical what has large consequences for dislocation properties. The 1/2〈331] slip on the {013) planes was observed at high temperatures above 900°C when compressed along [001], but surprisingly, also below 500°C when compressed along [0151]. Why different dislocation behaviour is observed at high and low temperatures is explained in this paper.
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