Deformation Microstructure And Texture Transformations In FCC Metals Of Medium-To-High Stacking Fault Energy: Critical Role Of Micro- And Macro-Scale Shear Bands

Archives of Metallurgy and Materials

M. M. Miszczyk¹  H. Paul¹ 

[1]INSTITUTE OF METALLURGY AND MATERIALS SCIENCE, PAS, 25 REYMONTA STR., 30-059 KRAKÓW, POLAND

关键词: Keywords: Shear bands;    Texture;    SEM/EBSD;    Copper;    AA1050 alloy;    Plane strain compression;   

DOI  :  10.1515/amm-2015-0369

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Microstructure and texture development in medium-to-high stacking fault energy face centred cubic metals were investigated in order to examine the role of lattice re-orientation on slip propagation across grain boundaries and to characterize the influence of micro- and macro-scale copper-type shear bands on textural changes at large deformations. Polycrystalline pure copper (fine - and coarse - grained) and fine-grained AA1050 alloy were deformed in plane strain compression at room temperature to form two sets of well-defined macroscopic shear bands. The deformation-induced sub-structures and local changes in crystallographic orientations were investigated mostly by scanning electron microscopy equipped with high resolution electron backscattered facility. In all the deformed grains within macro- shear bands a strong tendency to strain-induced re-orientation was observed. The flat, strongly deformed grains exhibited a deflection within narrow areas. The latter increased the layers’ inclination with respect to ED and led to kink-type bands, which are the precursors of MSBs. The mechanism of macro- / micro-shear bands formation is strictly crystallographic since in all the areas of the sheared zone, the crystal lattice rotated such that one of the {111} slip planes became nearly parallel to the shear plane and the <011> direction became parallel to the direction of maximum shear. This strain-induced crystal lattice rotation led to the formation of specific macro- / micro-shear bands components that facilitated slip propagation across the grain boundaries without any visible variation in the slip direction.

【 授权许可】

Unknown