Grain boundary engineering parameters for ultrafine grained microstructures: Proof of principles by a systematic composition variation in the Cu-Ni system

Characterization of Special Grain Boundaries and Triple Junctions in CuxNi1‐x Alloys upon Deformation and Annealing

“…Both, the formation of solid solutions and the stacking fault energy influence recovery characteristics and twinning propensities of a material. By the investigation of the Cu–Ni system the evolution of microstructures can be linked to the different composition dependent properties, as described in a previous work . It was found that the increase in 3‐GBs versus the grain size is influenced by the solid solution effect, whereas the increase in 9‐GBs versus the grain size is influenced by the stacking fault energy.…”

“…Since recovery and recrystallization are closely related to GB mobility, it can be assumed that gradients in the solid‐solution concentration and/or small segregations (in this virtually non‐segregating system) is the origin of the lower fraction of special GBs and TJs in alloys. Grain boundary engineering by solute decoration of GBs via segregation is for instance done by Raabe et al For more details on the analysis of different parameters influencing the evolution of Cu–Ni microstructures, the reader is referred to a previous work …”

A Comparison of Strengthening Mechanisms of Austenitic Fe-13Mn-1.3C Steel in Warm and Cold High-Pressure Torsion

“…The data in Table 3 represent just a relative importance of strengthening factors in strength properties of Fe-13Mn-1.3C steel in HPT at different temperatures and post-deformation annealing. The direct comparison and totalization of different contributions could be speculative, because the constants in Equations (2) and (4)- (6) have been determined for Mn-steels with another carbon content and other microstructures (distribution and densities of dislocations and twins). The solid-solution hardening, strengthening effect from twin boundaries and dislocations all provide high values of the microhardness in cold HPT 23 .…”

“…Grain boundary engineering (GBE) proposed by T. Watanabe [1] is one of the most promising ways to increase constructional and functional properties of different metals and alloys by modifying their grain boundary assemble-distribution and characteristics of grain boundaries [2][3][4][5]. The grain boundary engineering of materials' microstructure, including steels, could be effectively realized through a combination of severe plastic deformation (SPD) and post-deformation thermal treatments [1,[6][7][8]. To date, a high-pressure torsion (HPT) has been successfully applied for obtaining ultrafine-grained and nanograined structures in a variety of metallic materials [9][10][11].…”

SPECIFIC FEATURES OF THE GRAIN STRUCTURE IN Ni-Cu ALLOYS AT THE SATURATION STAGE UNDER HIGH-PRESSURE TORSION

“…Цель настоящей работы -расширить имеющиеся представления [28,29] о сплавах системы Cu-Ni на основе анализа структуры, сформировавшейся на стадии насыщения.…”