INFLUENCE OF 2ND-PHASE PARTICLES ON PLASTIC-DEFORMATION AND LATTICE REORIENTATION OF SINGLE-CRYSTALS DURING UNIAXIAL COMPRESSION

Changes in the orientation of crystal axes of Al-0.8 wt% Si single cry stals in the presence of two different particle sizes and inter-partic le spacings were investigated during uniaxial compression. The orienta tion of crystal axes before and after deformation was precisely determ ined by the diffractometer method in the unit triangle of the stereogr aphic projection. The reorientation of the compression axes after defo rmation was found to be influenced by particle size and initial orient ation of the undeformed crystals. It was found that particle size also influenced the yield strength and work-hardening characteristics whic h was explained on the basis of Orowan stresses and solid-solution str engthening.