SYNCHROTRON X-RAY CHARACTERIZATION OF ANISOTROPIC MICROSTRUCTURES OF METALS AND ALLOYS SUBJECT TO SEVERE PLASTIC DEFORMATION

R.E. BOLMARO; E. BENATTI; N. S. DE VINCENTIS; M. C. AVALOS; A. KLIAUGA; M. FERRANTE; A. M. SALCEDO GARRIDO; F. CRUZ GANDARILLA; N. SCHELL; H-G. BROKMEIER

Cancún

Congreso; XXIV International Materials Research Congress; 2015

Several Severe Plastic Deformation (SPD) processes have been developed thatallow the production of ultra-fine (micro-nano) structured metals and alloys.Simultaneous increase in strength and ductility are among the main soughtproperties on SPD processed materials. Twins, dislocation arrays and grain sizeevolution are the main microstructure features associated with macroscopicproperties. Synchrotron radiation has relatively recently achieved wide availability and technical feasibility to be routinely used for the determination of direction dependent crystallographic data. Texture has been long analyzed by this method but microstructure has been inspected only on a limited number of directions due to the difficulties for automatic analysis, despite the information is already available.We present a few typical alloys subject to SPD processing exemplifying theanisotropic development of microstructure. The data was taken at DESY-Hamburg,Petra III GEM beam line by transmission geometry. Debye-Scherrer image plateswere batch processed using CMWP implementation of Warren-Averbach peakbroadening analysis. The final data is shown as Generalized Pole Figures for themain parameters and variables (grain sizes, dislocation densities, twin densities, correlation factors, etc.). Results are correlated with slip system activities, stacking faults and texture. The anisotropic storage of dislocations and preferential grain size diminution, as well as the rest of fitting parameters, are attempted to be rationalized on micromechanical basis.