Transmission electron microscopy of dislocation structures in V3Si single crystals after deformation at high temperatures

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Abstract
The plastic deformation of the intermetallic compound V3Si at 1280 to 1500°C takes place by gliding and climbing of dislocations. The Burgers vector of single dislocations is 〈100〉. Occasionally a dislocation with Burgers vector 〈110〉 is observed in nodes. The slip plane of indirectly heated samples is {001}. Straight dislocations preferentially run along 〈100〉 and 〈110〉 directions. The absence of screw dislocations is explained by their higher mobility compared with edge and 45° dislocations and the presence of two slip planes for each screw dislocation. Sub-grain boundaries in deformed crystals are mostly formed by two sets of dislocations with different Burgers vectors of type 〈100〉. During dynamic recovery elongated prismatic dislocation loops are generated in 〈100〉 directions.