Slip line studies in deformed ordered and disordered Cu3Au single crystals
Shaikh, Fasih Ahmed
Roberts, John M.
Master of Science
A detailed study of the slip lines in deformed ordered and disordered Cu3Au single crystals has been carried out. The slip lines have been observed via optical metallography and by the two-step replica technique and subsequent examination in the electron microscope. Typical macroscopic stress-strain curves for each type of crystal have been noted as well as the change of specimen axis orientation with deformation. The crystals were deformed in strain increments of about 5/0: After each strain increment, characteristic slip lines and specimen axis rotation were evaluated and studied. The current results are discussed in the light of the quantitative work hardening theories presented for ordered L12 type superlattices by Vidoz26 and Schoeck.25 The results do not lend total support to either theory. In a qualitative discussion of the experimental data, we find the theory of Schoeck25 to define the pertinent obstacles for dislocation glide in this type superlattice. For clarity, however, it appears further analysis of the details of the breakdown of attractive superdislocation junctions in ordered type L12 super-lattices is required.