Effect of Annealing on the Microstructure and Properties of In-situ Cu-Nb Microcomposite Wires

doi:10.1007/s40195-016-0432-z

Abstract

Abstract:

The effects of annealing on microstructure, magnetoresistance, and hardness of an in situ Cu-Nb microcomposite wire have been investigated. Neither changes in microstructure nor hardness were found until 500 °C. Particularly, microstructural change within the Nb films was observed in the annealed samples. The room-temperature magnetoresistivity was almost negligible, while magnetoresistivity at -196 °C increased with magnetic field. At temperature above 500 °C, recovery and recrystallization occurred, and both the resistance and hardness decreased.

Key words: Annealing, Microstructure, Magnetoresistance, Hardness, Cu-Nb microcomposite wire

Li-Ping Deng, Bing-Shu Wang, Hong-Liang Xiang, Xiao-Fang Yang, Rong-Mei Niu, Ke Han. Effect of Annealing on the Microstructure and Properties of In-situ Cu-Nb Microcomposite Wires[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(7): 668-673.

Figures/Tables 6

Fig. 1 Experimental setup for MR test. B is the external magnetic field; I is the current

Fig. 2 SEM images showing the microstructures of as-drawn wires: a cross section; b longitudinal section. The arrow shows the drawing direction or the wire axis

Fig. 3 Longitudinal microstructures of Cu-Nb microcomposite wires after annealing at different temperatures for 1 h: a 400 °C, the inset showing the cross-sectional image, b 500 °C, c 600 °C, d 700 °C, e 800 °C, f 900 °C; the arrows showing drawing direction (DD) or the wire axis

Table 1 Microstructural sizes of Nb and Cu phases (Nb phase in thickness or diameter, Cu phase in width, and electron mean free path lo)

Phase	l_o (nm) [11, 40]		Phase size (nm)
Phase	25 °C	-196 °C	25 °C	400 °C	900 °C
Nb	3.1	17.6	25	25	104
Cu	43-45	138-145	54	55	133

Fig. 4 MR of wires plotted as annealing temperatures: a tested at 25 °C; b tested at -196 °C. The annealing temperature for the as-drawn specimen is assumed to be 25 °C

Fig. 5 Hardness response after annealing

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