Effect of Multiaxial Forging on Structure Evolution and Mechanical Properties of Oxygen Free Copper

Abstract:

Evolution of micro- and macrostructure and mechanical properties of oxygen-free copper after MAF at room temperature was studied. MAF included sequential upsetting and drawing with total cycles number equal to 20 and maximum strain ≈50. MAF causes the formation of homogenous UFG structure with a grain/subgrain size of 0.3 m and fraction of high angle boundaries 50%, but macrostructure is heterogeneous. Rough shear macrobands areas of different orientation are observed. MAF results in significant strengthening from 280 MPa to 445 MPa, but samples remain very ductile even after large strains. Mechanisms of UFG structure formations during MAF are discussed.

• Periodical: Materials Science Forum (Volumes 667-669)
• Pages: 289-294
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.667-669.289
• Online since: December 2010
• Authors: Gennady A. Salishchev, Nikita Stepanov, A.V. Kuznetsov, Sergey V. Zherebtsov, Oleg R. Valiakhmetov, A.A. Kuznetsov, Sergey V. Dobatkin
• Keywords: Copper, Evolution Microstructure, Macro Shear Bands, Macrostructure, Mechanical Property, Multiaxial Forging, Ultrafine Grained

References

[1] S.Y. Mironov, G.A. Salishchev et al:  Mater. Sci. and Eng. A Vol. 418 (2006), p.257.

[2] S.V. Zherebtsov, S.Y. Mironov et al: Mater. Sci. Forum Vol. 551-552 (2007), p.183.

[3] S.V. Zherebtsov, G.A. Salishchev et al: Scripta Mater. Vol. 51 (2004), p.1147.

[4] T. Sakai, A. Belyakov, H. Miura: Metall. Mater. Trans. Vol. 39A (2008), p. (2008).

[5] H. Miura, T. Sakai et al: Metall. Mater. Trans. Vol. 40A (2009), p.2137.

[6] V.M. Bykov, V.A. Lihachev, Yu. A. Nikonov, L.L. Serbina, L.I. Shibalova: Phys. Met. Metallogr. Vol. 45 №1 (1978), p.163.

[7] A. Belyakov, T. Sakai, et al: Phil. Mag. A Vol. 81 №11 (2001), p.2629.

[8] S.L. Semiatin and G.D. Lahoti: Met. Trans. A Vol. 12A (1981), p.1705.

[9] R. Bieler, S.L. Semiatin: International Journal of Plasticity Vol. 18 (2002), p.1165.

[10] R. Z. Valiev, E. V. Kozlov, et al.: Acta Metall. Mater. Vol. 42 (1994), p.2467.

[11] G.A. Salishchev, O.N. Senkov et al: Advanced Performance Mater. Vol. 6(2) (1999), p.107.

[12] G.A. Salishchev et. al: Met. Sci. Heat Treatm. Vol. 48 (2006), p.63.

[13] S.V. Zherebtsov et. al: Scripta Mater. Vol. 51 (2004), p.1147.