Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-23T04:55:05.507Z Has data issue: false hasContentIssue false
  • English
  • Français

Compositional patterning in immiscible alloys subjected to severe plastic deformation

Published online by Cambridge University Press:  19 August 2013

Daniel Schwen ,
Miao Wang ,
Robert S. Averback  and
Pascal Bellon
Daniel Schwen*
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Illinois 61801; and Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Miao Wang
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champagin, Illinois 61801
Robert S. Averback
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champagin, Illinois 61801
Pascal Bellon
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champagin, Illinois 61801
*
a)Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

Compositional patterning in two-phase immiscible alloys during severe plastic deformation at elevated temperatures has been investigated. Kinetic Monte Carlo computer simulations were used to test the proposed idea that patterning derives from a dynamic competition between homogenization by forced chemical mixing and phase separation by thermally activated diffusion [P. Bellon and R.S. Averback, Phys. Rev. Lett.74, 1819 (1995) and F. Wu et al., Acta Mater.54, 2605 (2006)]. We utilize the concept of pair diffusion coefficients to compare thermal diffusion with forced chemical mixing and discuss the fundamentally different behavior with respect to pair separation distance in both mechanisms. While the general ideas of this model are verified and are in good quantitative agreement with our simulations, it is found that the dynamic processes of alloys under high-temperature shear are very complex, even in highly idealized systems, making experimental verification of this model very difficult. We illustrate our findings for a model AB alloy with properties similar to Cu–Ag by showing how alloy morphology and solubility depend on shear rate, temperature, and composition.

Keywords

diffusionsimulationsuperplasticity
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 19 , 14 October 2013 , pp. 2687 - 2693
Copyright
Copyright © Materials Research Society 2013 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Saito, Y., Utsunomiya, H., Tsuji, N., and Sakai, T.: Novel ultra-high straining process for bulk materials - development of the accumulative roll-bonding (ARB) process. Acta Mater. 47, 579 (1999).CrossRefGoogle Scholar
Dawes, C.J. and Thomas, W.M.: Friction stir process welds aluminum alloys. The process produces low-distortion, high-quality, low-cost welds on aluminum. Weld. J. 75, 41 (1996).Google Scholar
Rigney, D.A., Chen, L.H., Naylor, M.G.S., and Rosenfield, A.R.: Wear processes in sliding systems. Wear 100, 195 (1984).CrossRefGoogle Scholar
Sundararaman, M., Chen, W., Wahi, R.P., Wiedenmann, A., Wagner, W., and Petry, W.: TEM and SANS investigation of age hardened nimonic PE16 after cyclic loading at room temperature. Acta Metall. Mater. 40, 1023 (1992).CrossRefGoogle Scholar
Martin, G.: Transformations de phase et plasticité. Ann. Chim. Fr. 6, 46 (1981).Google Scholar
Detemple, K., Kanert, O., De Hosson, J.T.M., and Murty, K.L.: In situ nuclear magnetic resonance investigation of deformation-generated vacancies in aluminum. Phys. Rev. B 52, 125 (1995).CrossRefGoogle ScholarPubMed
Dienes, G.J. and Damask, A.C.: Radiation enhanced diffusion in solids. J. Appl. Phys. 29, 1713 (1958).CrossRefGoogle Scholar
Bellon, P. and Averback, R.S.: Nonequilibrium roughening of interfaces in crystals under shear: Application to ball milling. Phys. Rev. Lett. 74, 1819 (1995).CrossRefGoogle ScholarPubMed
Zghal, S., Twesten, R., Wu, F., and Bellon, P.: Electron microscopy nanoscale characterization of ball milled Cu-Ag powders. Part II: Nanocomposites synthesized by elevated temperature milling or annealing. Acta Mater. 50, 4711 (2002).CrossRefGoogle Scholar
Wu, F., Isheim, D., Bellon, P., and Seidman, D.N.: Nanocomposites stabilized by elevated-temperature ball milling of Ag50Cu50 powders: An atom probe tomographic study. Acta Mater. 54, 2605 (2006).CrossRefGoogle Scholar
Brocq, M., Radiguet, B., Le Breton, J-M., Cuvilly, F., Pareige, P., and Legendre, F.: Nanoscale characterisation and clustering mechanism in an Fe–Y2O3 model ODS alloy processed by reactive ball milling and annealing. Acta Mater. 58, 1806 (2010).CrossRefGoogle Scholar
Klassen, T., Herr, U., and Averback, R.S.: Ball milling of systems with positive heat of mixing: Effect of temperature in Ag-Cu. Acta Mater. 45, 2921 (1997).CrossRefGoogle Scholar
Odunuga, S., Li, Y., Krasnochtchekov, P., Bellon, P., and Averback, R.S.: Forced chemical mixing in alloys driven by plastic deformation. Phys. Rev. Lett. 95, 045901 (2005).CrossRefGoogle ScholarPubMed
Delogu, F.J.: Forced chemical mixing in model immiscible systems under plastic deformation. Appl. Phys. 104, 073533 (2008).CrossRefGoogle Scholar
Ashkenazy, Y., Vo, N.Q., Schwen, D., Averback, R.S., and Bellon, P.: Shear induced chemical mixing in heterogeneous systems. Acta Mater. 60, 984 (2012).CrossRefGoogle Scholar
Bachmaier, A., Kerber, M., Setman, D., and Pippan, R.: The formation of supersaturated solid solutions in Fe–Cu alloys deformed by high-pressure torsion. Acta Mater. 60, 860 (2012).CrossRefGoogle Scholar
Tóth, L.S., Neale, K.W., and Jonas, J.J.: Stress response and persistence characteristics of the ideal orientations of shear textures. Acta Metall. Mater. 37, 2197 (1989).CrossRefGoogle Scholar
Bortz, A.B., Kalos, M.H. and Lebowitz, J.L.: A new algorithm for Monte Carlo simulation of Ising spin systems. J. Comput. Phys. 17, 10 (1975).CrossRefGoogle Scholar
Cottrell, A.H.: Dislocations and Plastic Flow in Crystals (Oxford University Press, Oxford, 1953), p. 175.Google Scholar
Yavari, A.R.: Phase transformations in nanocrystalline alloys. Mater. Sci. Eng. 179, 20 (1994).CrossRefGoogle Scholar