Microstructure and Texture Evolution of Cu–Nb Nano-Composite Wire during Heat-Treatment

Abstract:

In this study, the microstructure and texture evolution of Cu-Nb nanocomposite wirescontaining 85⁴Nb fibers after heat treatment were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The resultsare shown as follows:(1)Nb had the phenomenon of edge spheroidization and thermal gullies after annealing at 400^oC. While the Nbfilaments were broken,showing edge spheroidization andcylinderization, and formed discontinuous bamboo-like structureafter annealing at 700^oC for 1h, and the phenomenon of bamboo-like structure, spheroidization andcylinderizationafter annealing at 700^oC for 2hwas moreseriousthan thatfor1h. (2) Several texture components appeared in the Cu matrix before heat treatment, however, <111>fiber texture component dominated after annealing at 400^oC and 700^oC. The textures of Nb filamentsseldomchanged during heat-treatment, exhibitinga major<110>fiber texture.

• Periodical: Materials Science Forum (Volume 788)
• Pages: 668-673
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.788.668
• Online since: April 2014
• Authors: Ze Yuan Sun*, Xiao Fang Yang, Li Ping Deng, Qing Liu
• Keywords: Cu-Nb Composite, Heat Treatment, Microstructure, Texture

References

[1] W.A. Spitzig A.R. Pelton F.C. Laabs，Characterization of the strength and microstructure ofheavily cold worked Cu-Nb composites, Acta Metall.35 (1987)2427-2442.

DOI: 10.1016/0001-6160(87)90140-4

[2] C. Biselli, D.G. Morris，Microstructure and strength of Cu-Fe in Situ composites after very high drawing strains, Acta Mater. 44 (1996) 493-504.

DOI: 10.1016/1359-6454(95)00212-x

[3] P.D. Funkenbusch T.H. Courtney, On the strength of heavily cold worked in situ compositesActaMetall.33(1985) 913-922.

DOI: 10.1016/0001-6160(85)90116-6

[4] J.D. Verhoeven, L.S. Chumbley, F.C. Laabs, W.A. Spitzig, Measurement of filament spacing in deformation processed Cu-Nb alloys, ActaMetall.39 (1991)2825-2834.

DOI: 10.1016/0956-7151(91)90100-f

[5] L. Thilly, O. Ludwig, M. Ve'ron, F. Lecouturier, High-strength materials: in-situ investigations of dislocation behaviour in Cu-Nb multifilamentary nanostructured composite,Philos Mag A. 82 (2002)925-942.

DOI: 10.1080/01418610208240010

[6] S.A.El-Badry,Development of copper-based metal matrix composites for electric motor commutator rings,Metal Powder Report, 58(2003)38.

DOI: 10.1016/s0026-0657(03)80265-5

[7] K. Spencer, F. Lecouturier, L. Thilly, J.D. Embury,Established and Emerging Materials for use as High-Field Magnet Conductors, Adv.Eng. Mat. 6 (2004)290-297.

DOI: 10.1002/adem.200400014

[8] V. Vidal, L. Thilly, F. Lecouturier, P.-O. Renault,Cu nanowhiskers embedded in Nb nanotubes inside a multiscale Cu matrix: The way to reach extreme mechanical properties in high strength conductors , Scripta Mater. 57 (2007)245-248.

DOI: 10.1016/j.scriptamat.2007.04.001

[9] M.J.R. Sandim, D. Stamopoullos H.R.Z. Sandim, et al, Size effects on the magnetic properties of Cu–Nb nanofilamentary wires processed by severe plastic deformation, Supercond.Sci. Technol.19( 2006)1233-1239.

DOI: 10.1088/0953-2048/19/12/002

[10] L. Thilly, F. Lecouturier, G. Coffe, Recent progress in the development of ultra-high strength "continuous" Cu/Nb and Cu/Ta conductors for non-destructive pulsed fields higher than 80 T,IEEE Trans. Appl. Superconduct. 12(2002) 1181-1184

DOI: 10.1109/tasc.2002.1018612

[11] L. Thilly, P. O. Renault, V.Vidal, et al, Plasticity of multiscale nanofilamentary Cu/Nb composite wires during in situ neutron diffraction: Codeformation and size effect, Appl. Phys.Lett.88 (2006)191906-191906-3.

DOI: 10.1063/1.2202720

[12] Liping Deng, Xiaofang Yang, Ke Han, Yafeng Lu, Ming Liang, Qing Liu, Microstructure and texture evolution of Cu–Nb composite wires, Materials characterization.81 (2013) 124-133.

DOI: 10.1016/j.matchar.2013.04.013

[13] Vidal V, Thilly L, Van Petegem S, Stuhr U, Lecouturier F,Renault PO, et al, Plasticity of nanostructured Cu–Nb-based wires: Strengtheningmechanisms revealed by in situ deformation under neutrons,Scripta Mater. 60(2009)171-174.

DOI: 10.1016/j.scriptamat.2008.09.032

[14] R.J. Klassen, K.T. Conlon, J.T. Wood,Thermal relaxation of internal strain in two-phase Cu–Nb wire,Scripta Mater.48(2003)385-389.

DOI: 10.1016/s1359-6462(02)00452-9

[15] PM Anderson, JF Bingert, A Misra, JP Hirth, Rolling textures in nanoscale Cu/Nb multilayers, Acta Mater.51(2003)6059-6075.

DOI: 10.1016/s1359-6454(03)00428-2

[16] Raabe D, Heringhaus F, Hangen U, Gottstein G. Z, Investigation of a Cu-20 mass% Nb in situ Composite, Part I: Fabrication, Microstructure and Mechanical Properties, Metallkde.86(1995)405-415.

DOI: 10.1515/ijmr-1995-860606

[17] HG Brokmeier, RE Bolmaro, JA Signorelly,A. Fourty,Annealing effects on the microstructure and texture of a multifilamentary Cu–Nb composite wire, Physica B.888(2000)276-278.

DOI: 10.1016/s0921-4526(99)01540-9

[18] F Dupouy, E Snoeck, M.J. Casanove, C Roucau, J.P. Peyrade, S Askenazy, Microstructural characterization of high strength and high conductivity nanocomposite wires,Scripta Mater.34 (1996)1067-1073.

DOI: 10.1016/1359-6462(95)00632-x

[19] H.R.Z. Sandim, M.J.R. Sandim , H.H. Bernardi , J.F.C. Lins , D. Raabe,Annealing effects on the microstructure and texture of a multifilamentary Cu–Nb composite wire , Scripta Mater.51 (2004)1099-1104.

DOI: 10.1016/j.scriptamat.2004.07.026

[20] Hackney S A,On the linear instability of the rayleigh spheroidization process , Scripta Metal.25(1991)799-804.

DOI: 10.1016/0956-716x(91)90228-s

[21] Sharma G, Ramanujan R. V, Tiwari G. P, et al,Instability mechanisms in lamellar microstructures,Acta Materialia.48 (2000)875-889.

DOI: 10.1016/s1359-6454(99)00378-x

[22] Liang Ming. Study on fabricatioin and properties of CuNb(Sn)materials for high field magnet. [dissertation] Xi'an: Northwestern Polytechnical University; (2010)