日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 82, No. 07 (2018),
pp. 262-268

Recrystallization Behavior and Texture of High-Purity Niobium for SRF Cavity

Yuta Yamaguchi 1, Takumi Izumi 1, Motohiro Yuasa 1, Hiroyuki Miyamoto 1 and Masashi Yamanaka 2

1 Department of Mechanical Engineering, Doshisha University
2 Mechanical Engineering Center, High Energy Accelerator Research Organization (KEK)

Abstract:

Deformation and recrystallization behavior of pure niobium was investigated in order to clarify the origin of its low hydro-formability despite its high ductility comparable with pure iron. Pure niobium exhibited lower strain hardening in cold rolling compared with pure iron. Furthermore, in post-deformation annealing, the hardness of niobium decreased monotonously with increasing temperature, and a typical sharp drop by recrystallization was not evident. This softening behavior was contrasted with the pure iron. It is suggested that niobium exhibits the so-called in-situ recrystallization because of its low elastic modulus and low accumulative plastic strain energy. The low hydro-formability of pure niobium sheets or tubes can be caused by its low strain hardening and in-situ recrystallization which is associated with this recovered residual rolled texture.

[doi:10.2320/jinstmet.J2018010]


(Received 2018/02/13)

Keywords:

pure niobium, strain hardening, texture, in-situ recrystallization, elastic modulus, SRF cavity


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