Paper Titles

Mechanical Properties of Ultrafine Grained Steels Processed by Large Strain-High Z Deformation - A Review
p.211

Measures of Ductility for UFG Materials Obtained by SPD
p.223

The Analysis of SPD Paradox by Computer Modeling Technique
p.231

A New Constitutive Model for Work Hardening Based on Gain Boundary Energy Density
p.249

The Influence of Work Hardening, Internal Stresses, and Stress Relaxation on Ductility of Ultrafine Grained Materials Prepared by Severe Plastic Deformation
p.263

Nanostructure Formation and Properties in Some Al Alloys after SPD and Heat Treatment
p.273

Effect of Ageing on Strength and Ductility of Ultrafine Grained Al 6061 Alloy
p.303

Structure, Strength and Ductility of As-Cast Al-Mg-Mn-Zr-Sc Alloys after Equal Channel Angular Pressing
p.311

Enhanced Ductility in Ultrafine-Grained Al Alloys Produced by SPD Techniques
p.321

HomeMaterials Science ForumMaterials Science Forum Vols. 633-634The Influence of Work Hardening, Internal...

The Influence of Work Hardening, Internal Stresses, and Stress Relaxation on Ductility of Ultrafine Grained Materials Prepared by Severe Plastic Deformation

Article Preview

Abstract:

Ultrafine grained materials prepared by methods of severe plastic deformation appear to show good ductility for their high strength. To a large extent this ductility enhancement, for the given strength, is shown to correspond to the fracture ductility and not the uniform ductility at maximum stress. The improved fracture ductility is often due to the refinement or removal of the coarse defects that act as sites for failure nucleation. The low work hardening rate inherent to the very fine microstructures produced by severe plastic deformation essentially condemns such materials to very low uniform ductility. Stress relaxation occurring during unloading after processing, and changes of internal stresses during reloading for mechanical testing, appear to play a significant role in determining deformation behaviour near the onset of plastic flow, and this can affect the measured uniform strain.

You might also be interested in these eBooks

Ductility of Bulk Nanostructured Materials

Info:

Periodical:

Materials Science Forum (Volumes 633-634)

Pages:

263-272

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.633-634.263

Citation:

Cite this paper

Online since:

November 2009

Authors:

David G. Morris, Maria A. Muñoz-Morris, Ivan Gutierrez-Urrutia

Keywords:

Ductility, Fracture, Internal Stress, Severe Plastic Deformation (SPD), Work-Hardening

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2010 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

[1] D.G. Morris, in: Mechanical Behaviour of Nanostructured Materials, Trans. Tech. Publications Ltd., Switzerland, (1998).

[2] C.C. Koch, D.G. Morris, K. Lu and A. Inoue: Mater. Res. Soc. Bull. 24 (1999) 54.

[3] D. Jia, Y.M. Wang, K.T. Ramesh, E. Ma, Y.T. Zhao and R.Z. Valiev: Appl. Phys. Letts. 79 (2001) 611.

[4] Y. Wang, M. Chen, F. Zhou and E. Ma: Nature 419 (2002) 912.

[5] E. Ma: Scripta Mater. 49 (2003) 663.

[6] Y.M. Wang and E. Ma: Appl. Phys. Letts. 83 (2003) 3165.

[7] Q. Wei, L. Keeskes, T. Jiao, K.T. Hartwig, K.T. Ramesh and E. Ma: Acta Mater. 52 (2004) 1859.

[8] Y.M. Wang and E. Ma: Acta Mater. 52 (2004) 1699.

[9] R.Z. Valiev and T.G. Langdon: Prog. Mater. Sci. 51 (2006) 881.

[10] M. Dao, L. Lu, R.J. Asaro, J.T. M De Hosson and E. Ma: Acta Mater. 55 (2007) 4041.

[11] C.C. Koch: Scripta Mater. 49 (2003) 657.

[12] R.Z. Valiev: Mater. Sci. Eng. A234-236 (1997) 59.

[13] R.Z. Valiev, R.K. Islamgaliev and I.V. Alexandrov: Prog. Mater. Sci. 45 (2000) 103.

[14] H.W. Kim, S.B. Kang, N. Tsuji and Y. Minamino: Acta Mater. 53 (2005) 1737.

[15] S.V. Dobatkin, J.A. Szpunar, A.P. Zhilyaev, J. -Y. Cho and A.A. Kuznetsov: Mater. Sci. Eng. A462 (2007) 132.

[16] R.Z. Valiev, I.V. Alexandrov, Y.T. Zhu and T.C. Lowe: J. Mater. Res. 17 (2002) 5.

[17] B.Q. Han and T.G. Langdon: Mater. Sci. Eng. A410-411 (2005) 430.

[18] S. Cheng, Y.H. Zhao, Y.T. Zhu and E. Ma: Acta Mater. 55 (2007) 5822.

[19] Y.H. Zhao, X.Z. Liao, Z. Horita, T.G. Langdon and Y.T. Zhu: Mater. Sci. Eng. A493 (2008) 123.

[20] Y. Zhang, N.R. Tao and K. Lu: Acta Mater. 56 (2008) 2429.

[21] Y.S. Li, Y. Zhang, N.R. Tao and K. Lu: Scripta Mater. 59 (2008) 475.

[22] Y.H. Zhao, Y.Z. Guo, Q. Wei, A.M. Dangelwicz, C. Xu, Y.T. Zhu, T.G. Langdon, Y.Z. Zhou and E.J. Lavernia: Scripta Mater. 59 (2008) 627.

[23] M. Legros, B.R. Elliott, M.N. Rittner, J.R. Weertman and K.J. Hemker: Phil. Mag. A80 (2000) 1017.

[24] I. Gutierrez-Urrutia, M.A. Muñoz-Morris and D.G. Morris: Mater. Sci. Eng. A394 (2005) 399.

[25] I. Gutierrez-Urrutia, M.A. Muñoz-Morris and D.G. Morris: J. Mater. Res. 21 (2006) 329.

[26] I. Gutierrez-Urrutia, M.A. Muñoz-Morris and D.G. Morris: Acta Mater. 55 (2007) 1319.

[27] J. Wang, Y. Iwahishi, Z. Horita, M. Furukawa, M. Nemoto, R.Z. Valiev and T.G. Langdon: Acta Mater. 44 (1996) 2973.

[28] Y.H. Zhao, J.F. Bingert, Y.T. Zhu, X.Z. Liao, R.Z. Valiev, Z. Horita, T.G. Langdon, Y.Z. Zhou and E.J. Lavernia: Appl. Phys. Letts: 92 (2008) 081903.

DOI: 10.1063/1.2870014

[29] U.F. Kocks and H. Mecking: Prog. Mater. Sci. 48 (2003) 171.

[30] T. Hasegawa, T. Yakou and U.F. Kocks: Mater. Sci. Eng. 81 (1986) 189.

[31] I.A. Ovid´ko and A.G. Sheinerman: Acta Mater. 57 (2009) 2217.

[32] I. Sabirov, M.R. Barnett, Y. Estrin and P.D. Hodgson: Scripta Mater. (2009) in press.

[33] R. Lapovok, P.W.J. McKenzie, P.F. Thonson and S.L. Semiatin: Int. J. Mat. Res. 98 (2997) 325.

[34] Z. Horita, T. Fujinami and T.G. Langdon: Mater. Sci. Eng. A318 (2001) 34.

[35] C. Xu, Z. Szaraz, Z. Trojanova, P. Lukac and T.G. Langdon: Mater. Sci. Eng. A497 (2008) 206.

[36] D. J: Alexander and I.J. Beyerlein: Mater. Sci. Eng. A410-411 (2005) 480.

[37] M. Haouaoui, I. Karaman and H.J. Maier: Acta Mater. 54 (2006) 5477.

[38] W. Wei, K.X. Wei and G.J. Fan: Acta Mater. 56 (2008) 4771.