A quasi-in situ EBSD study of the mechanism of cubic texture formation in a large strain Ni5W alloy substrates

Abstract In this paper, the nucleation mechanism of recrystallized cubic orientation grains on the surface rolling direction-transverse direction (RD-TD) and cross-section rolling direction-normal direction (RD-ND) of Ni5W alloy substrates under a strain level of 5.1 was investigated using the quasi-in-situ electron backscatter diffraction technique. The results indicate that during the nucleation stage, a pronounced shear band is formed on the surface RD-TD of the Ni5W alloy substrate with a strain level of 5.1, where recrystallized grains preferentially nucleate near the shear band, exhibiting a more significant recrystallization nucleation phenomenon compared to the cross-section RD-ND. Moreover, it was found that the recrystallized cubic grains in the Ni5W alloy substrate with a strain level of 5.1 do not originate from the initial rolling cubic grains, but are formed through twinning of S-oriented grains, further clarifying the source of recrystallized cubic grains. It lays a theoretical foundation for the large-scale production of Ni5W alloy substrates and provides support for the practical application of second-generation high-temperature superconducting coated conductors, which is of strong scientific significance and social value.