Abstract
Stability and motion of low-angle dislocation boundaries in an array of particles is investigated. The 2D model considers discrete dislocations and circular precipitates with and without coherency stress fields. Dislocation – dislocation interactions, superimposed with precipitate stress fields and an externally applied stress, drive glide and climb of the dislocations. Results show that, in the case of a simple external shear loading, a single-valued critical applied shear stress exists which separates stable and unstable low-angle boundary configurations. This critical stress can differ considerably from the Orowan stress. More complicated applied stress states result in less clearly defined transitions between stable and unstable boundary regimes. Dislocation – dislocation interactions that stabilize low-angle dislocation boundaries thus may influence the high-temperature strength of particle-strengthened alloys.
-
Financial support received from the Grant Agency of the Czech Republic under the contract number GA CR 106/05/091B is acknowledged.
References
[1] W. Blum, B. Reppich, in: B. Wilshire, R.W. Evans (Eds.), Progress in Creep and Fracture, Vol. 3, Pineridge Press, Swansea (1985), 83.Suche in Google Scholar
[2] B. Reppich, in: H. Mughrabi (Ed.), Materials Science and Technology, Vol. 6: Plastic Deformation and Fracture of Materials, VCH Verlagsgesellschaft, Weinheim (1993) 311.Suche in Google Scholar
[3] E. Orowan, in: Symposium on Internal Stresses in Metals and Alloys, Session III Discussion, Institute of Metals, London (1948) 451.Suche in Google Scholar
[4] A.J.E. Foreman, M.J. Makin: Phil. Mag. 14 (1966) 911.10.1080/14786436608244762Suche in Google Scholar
[5] R. Lagneborg: Scripta Metall. 7 (1973) 605.10.1016/0036-9748(73)90222-6Suche in Google Scholar
[6] L.M. Brown, R.K. Ham, in: A. Kelly, R.B. Nicholson (Eds.), Strengthening Methods in Crystals, Applied Science Publishers Ltd., London (1971) 9.Suche in Google Scholar
[7] J.H. Hausselt, W.D. Nix: Acta Metall. 25 (1977) 595.10.1016/0001-6160(77)90001-3Suche in Google Scholar
[8] V.C. Nardone, J.K. Tien: Scripta Metall. 17 (1983) 467.10.1016/0036-9748(83)90333-2Suche in Google Scholar
[9] J.H. Schröder, E. Arzt: Scripta Metall. 19 (1985) 1129.10.1016/0036-9748(85)90022-5Suche in Google Scholar
[10] E. Arzt, D.S. Wilkinson: Acta Metall. 34 (1986) 1893.10.1016/0001-6160(86)90247-6Suche in Google Scholar
[11] J. Rösler, E. Arzt: Acta Metall. Mater. 38 (1990) 671.10.1016/0956-7151(90)90223-4Suche in Google Scholar
[12] J. Cadek, V. Šustek, M. Pahutová: Mater. Sci. Eng. A 225 (1997) 22.10.1016/S0921-5093(96)10569-4Suche in Google Scholar
[13] W. Blum, in: H. Mughrabi (Ed.), Materials Science and Technology, Vol. 6: Plastic Deformation and Fracture of Materials, VCH Verlagsgesellschaft, Weinheim (1993) 359.Suche in Google Scholar
[14] M. Heilmaier, B. Reppich: Mater. Sci. Eng. A 234 (1997) 501.10.1016/S0921-5093(97)00258-XSuche in Google Scholar
[15] J.P. Hirth, J. Lothe: Theory of dislocations, 2nd edition, Krieger Publishing Company, Malabar (1992).Suche in Google Scholar
[16] S.F. Exell, D.H. Warrington: Phil. Mag. 26 (1972), 1121.10.1080/14786437208227368Suche in Google Scholar
[17] D. Caillard, J.L. Martin: Acta Metall. 30 (1982) 791.10.1016/0001-6160(82)90077-3Suche in Google Scholar
[18] S. Vogler, W. Blum, in: B. Wilshire, R.W. Evans (Eds.), Creep and Fracture of Engineering Materials and Structures, The Institute of Metals, London (1990), 65.Suche in Google Scholar
[19] G. Eggeler: Acta Metall. 37 (1989) 3225.10.1016/0001-6160(89)90194-6Suche in Google Scholar
[20] D. Caillard, J.L. Martin: Rev. Phys. Appl. 22 (1987) 169.10.1051/rphysap:01987002203016900Suche in Google Scholar
[21] J. Pešička, A. Dronhofer, R. Kužel, G. Eggeler: Acta Mater. 51 (2003) 4847.10.1016/S1359-6454(03)00324-0Suche in Google Scholar
[22] A. Dronhofer, J. Pešička, A. Dlouhý, G. Eggeler: Z. Metallkd. 94 (2003) 511.10.3139/146.030511Suche in Google Scholar
[23] G. Eggeler, J. Khalil-Allafi, K. Neuking, A. Dlouhý: Z. Metallkd. 93 (2002) 654.10.3139/146.020654Suche in Google Scholar
[24] H.H.M. Cleveringa, E. van der Giessen, A. Needleman: Acta Mater. 45 (1997) 3163.10.1016/S1359-6454(97)00011-6Suche in Google Scholar
[25] M. Probst-Hein, A. Dlouhý, G. Eggeler: Acta Mater. 47 (1999) 2497.10.1016/S1359-6454(99)00092-0Suche in Google Scholar
[26] D. Holec: B.Sc. thesis, Masaryk University, Brno (2003).Suche in Google Scholar
[27] J.D. Eshelby: Proc. Roy. Soc. A 241 (1957) 376.Suche in Google Scholar
[28] X. Ren, N. Miura, J. Zhang, K. Otsuka, K. Tanaka, M. Koiwa, T. Suzuki, Yu.I. Chumlyakov, M. Asai: Mater. Sci. Eng. A 312 (2001) 196.10.1016/S0921-5093(00)01876-1Suche in Google Scholar
[29] S. Wolfram: The Mathematica Book, 4th edition, Wolfram Media/Cambridge University Press, Cambridge (1999).Suche in Google Scholar
[30] R. Völkl, U. Glatzel, M. Feller –Kniepmeier: Acta Mater. 46 (1998) 4395.10.1016/S1359-6454(98)00085-8Suche in Google Scholar
[31] M.F. Ashby: Phil. Mag. 21 (1970), 399.10.1080/14786437008238426Suche in Google Scholar
[32] N.A. Fleck, M.F. Ashby, J.W. Hutchinson: Scripta Mater. 48 (2003) 179.10.1016/S1359-6462(02)00338-XSuche in Google Scholar
© 2005 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Articles Basic
- Identifying creep mechanisms in plastic flow
- A unified microstructural metal plasticity model applied in testing, processing, and forming of aluminium alloys
- Implications of non-negligible microstructural variations during steady-state deformation
- Tertiary creep of metals and alloys
- Interactions between particles and low-angle dislocation boundaries during high-temperature deformation
- Strain-rate sensitivity of ultrafine-grained materials
- Transient plastic flow at nominally fixed structure due to load redistribution
- Vacancy concentrations determined from the diffuse background scattering of X-rays in plastically deformed copper
- Effect of heating rate in α + γ dual-phase field on lamellar microstructure and creep resistance of a TiAl alloy
- About stress reduction experiments during constant strain-rate deformation tests
- Finite-element modelling of anisotropic single-crystal superalloy creep deformation based on dislocation densities of individual slip systems
- Variational approach to subgrain formation
- Articles Applied
- Pseudoelastic cycling of ultra-fine-grained NiTi shape-memory wires
- Creep properties at 125 °C of an AM50 Mg alloy modified by Si additions
- Dependence of mechanical strength on grain structure in the γ′ and oxide dispersions-trengthened nickelbase superalloy PM 3030
- On the improvement of the ductility of molybdenum by spinel (MgAl2O4) particles
- Hot workability and extrusion modelling of magnesium alloys
- Characterization of hot-deformation behaviour of Zircaloy-2: a comparison between kinetic analysis and processing maps
- Requirements for microstructural investigations of steels used in modern power plants
- Influence of Lüders band formation on the cyclic creep behaviour of a low-carbon steel for piping applications
- Creep and creep rupture behaviour of 650 °C ferritic/martensitic super heat resistant steels
- Toughening mechanisms of a Ti-based nanostructured composite containing ductile dendrites
- Notifications/Mitteilungen
- Personal/Personelles
- News/Aktuelles
- Conferences/Konferenzen
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Articles Basic
- Identifying creep mechanisms in plastic flow
- A unified microstructural metal plasticity model applied in testing, processing, and forming of aluminium alloys
- Implications of non-negligible microstructural variations during steady-state deformation
- Tertiary creep of metals and alloys
- Interactions between particles and low-angle dislocation boundaries during high-temperature deformation
- Strain-rate sensitivity of ultrafine-grained materials
- Transient plastic flow at nominally fixed structure due to load redistribution
- Vacancy concentrations determined from the diffuse background scattering of X-rays in plastically deformed copper
- Effect of heating rate in α + γ dual-phase field on lamellar microstructure and creep resistance of a TiAl alloy
- About stress reduction experiments during constant strain-rate deformation tests
- Finite-element modelling of anisotropic single-crystal superalloy creep deformation based on dislocation densities of individual slip systems
- Variational approach to subgrain formation
- Articles Applied
- Pseudoelastic cycling of ultra-fine-grained NiTi shape-memory wires
- Creep properties at 125 °C of an AM50 Mg alloy modified by Si additions
- Dependence of mechanical strength on grain structure in the γ′ and oxide dispersions-trengthened nickelbase superalloy PM 3030
- On the improvement of the ductility of molybdenum by spinel (MgAl2O4) particles
- Hot workability and extrusion modelling of magnesium alloys
- Characterization of hot-deformation behaviour of Zircaloy-2: a comparison between kinetic analysis and processing maps
- Requirements for microstructural investigations of steels used in modern power plants
- Influence of Lüders band formation on the cyclic creep behaviour of a low-carbon steel for piping applications
- Creep and creep rupture behaviour of 650 °C ferritic/martensitic super heat resistant steels
- Toughening mechanisms of a Ti-based nanostructured composite containing ductile dendrites
- Notifications/Mitteilungen
- Personal/Personelles
- News/Aktuelles
- Conferences/Konferenzen