Effect of silver on texture formation of Ni-7at.%W alloy substrates

Abstract

Abstract: The Ag element can make grains in the substrates of Ni and Ni-5at.%W alloy elongated so as to improve the current transmission ability of superconducting layer. The mechanism of Ag effect on texture of NiW substrates with high W content (>5at.%W) may be the basis for subsequent control of grain structure morphology. The results show that the presence of Ag decreases volume fraction of S-orientation in substrate, which further affects the formation of cubic crystal texture in the baseband after recrystallization. By introducing intermediate heat treatment at 550 ℃ for 2 h as the rolling deformation reaches about 90%, the deformation factor R of cold rolled baseband can be increased from 0.72 to 1.05, thus increasing the volume fraction of copper texture and increasing the orientation of deformed cubic crystals in the baseband by 65%. Finally, the alloy baseband with a volume fraction of 96.8% Ni-7at.%W-0.01at.%Ag with cubic crystal texture on the surface can be obtained after recrystallization in the heat treatment.

Key words: coated conductors, Ni7W alloy substrate, texture, silver

CLC Number:

TG132.26

GAO Mang-mang, SU Sheng-yao, ZHANG Fang-yuan, ZHAO Xu, MA Lin, SUO Hong-li. Effect of silver on texture formation of Ni-7at.%W alloy substrates[J]. Journal of Lanzhou University of Technology, 2021, 47(1): 5-6.

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