{103}⟨331⟩ slip in MoSi2

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Abstract
{103}⟨331⟩ slip is found to be activated in MoSi2 single crystals by deformation along [001] in uniaxial compression at 1000°C. The {103} slip plane has been determined by slip trace analysis. Observations by transmission electron microscopy reveal the presence of screw dislocations with a Burgers vector of ½⟨331⟩. However, ½⟨331⟩ dislocations of mixed character lying along the ⟨ 010 ⟩ direction are observed to have decomposed into two other perfect dislocations by the energetically favourable reaction ½⟨ 331 ⟩→½⟨111⟩ + ⟨110⟩. The occurrence of such dislocation decomposition explains the difficulty of observing ½⟨331⟩ dislocations in previous work. The ½⟨331⟩ screw dislocations have been examined by weak-beam dark-field microscopy but dissociation into three ½⟨331⟩ collinear partials could not be detected.

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