Slip Systems in Erbia Single Crystals

摘要

Dislocation motion during high-temperaturedeformation of erbia single crystals has been investigated.Compressive deformation along various crystallographic axes at1640 deg C resulted in slip on {1l0} planes. The Burgers vectorwas determined to be b valence 1/2 <111>. Dislocations withsuch a large Burgers vector, (9.1 A), can dissociate into 1/4 <110> and 1/4 < 112> partials. The critical resolved shear stressof the samples at 1640 deg C was estimated to be about 38 MPa.Cleavage at room temperature was found to be on {111} planes.