Skip to main content Accessibility help
×
Home

New configuration of a [001] superdislocation formed during high-temperature creep in the γ′ phase of a single-crystal superalloy TMS-138

  • J.X. Zhang (a1), H. Harada (a1) and Y. Koizumi (a1)

Abstract

A new configuration of a superdislocation in the γ′ phase of a fourth-generation single-crystal TMS-138 superalloy was found after creep rupture in a [001] tensile test at 1150 °C and 137 MPa. The segments of the superdislocation lie in four directions, i.e., [110], [110], [100], and [010], strictly on a (001) plane with a Burgers vector b = [001]. This superdislocation is pure edge in character and does not dissociate into superpartials. Microstructural evidence shows that this kind of superdislocation is formed by combination of two interfacial dislocations with different Burgers vectors, i.e., 1/2[011] + 1/2[011] → [001].

Copyright

Corresponding author

a) Address all correspondence to this author. e-mail: jian-xin.zhang@nims.go.jp

References

Hide All
1.Nabarro, F.R.N., de Villiers, H.L.: The Physics of Creep (Taylor and Francies, London, UK, 1995), p. 187.
2.Kear, B.H., Hornbecker, M.F.: Deformation structure in polycrystalline Ni3Al. Trans. Am. Soc. Metals 59, 155 (1966).
3.Staton-Bevan, A.E., Rawlings, R.D.: Dislocation structures in deformed single-crystal Ni3(Al,Ti). Philos. Mag. 32, 787 (1975).
4.Sun, Y.Q., Hazzledine, P.M. Geometry of dislocation glide in L12 γ′ phase: TEM observations, in Dislocations in Solids, Vol. 10, edited by Nabarro, F.R.N. and Duesbery, M.S. (Elsevier Science, Amsterdam, The Netherlands, 1996), p. 29.
5.Sun, Y.Q., Hazzledine, P.M.: A TEM weak-beam study of dislocations in γ′ in a deformed Ni-based superalloy. Philos. Mag. A 58, 603 (1988).
6.Pollock, T.M., Argon, A.S.: Creep resistance of CMSX-3 nickel base superalloy single crystals. Acta Metal. Mater. 40, 1 (1992).
7.Louchet, F., Ignat, M.: TEM analysis of square-shaped dislocation configurations in the γ′ phase of a Ni-based superalloy. Acta Metal. 34, 1681 (1986).
8.Bonnet, R., Ati, A.: Observation of interactions of γ/γ′ interfacial dislocations in the two-phase superalloy. Acta Metall. 37, 2153 (1989).
9.Eggeler, G., Dlouhy, A.: On the formation of 〈010〉-dislocations in the γ′-phase of superalloy single crystals during high temperature low stress creep. Acta Mater. 45, 4251 (1997).
10.Srinivasan, R., Eggeler, G.F., Mills, M.J.: γ′-cutting as rate-controlling recovery process during high-temperature and low-stress creep of superalloy single crystals. Acta Mater. 48, 4867 (2000).
11.Srinivasan, R., Nathal, M.V., Daw, M.S., Eggeler, G.F., Mills, M.J. Mechanisms of shearing of γ′ precipitates during high temperature / low stress creep of superalloy single crystals, in Structural Intermetallics 2001, edited by Hemker, K.J., Dimiduk, D.M., Clemens, H., Darolia, R., Inui, H., Larsen, J.M., Sikka, V.K., Thomas, M., and Whittenberger, J.D. (The Minerals, Metals & Materials Society, Warrendale, PA, 2001), p. 423.
12.Koizumi, Y., Zhang, J.X., Kobayashi, T., Yokokawa, T., Harada, H., Aoki, Y., Arai, M.: Development of next generation Ni-base single crystal superalloys containing ruthenium. J. Japan Inst. Metals. 67, 468 (2003).
13.Edington, J.W.: Practical Electron Microscopy in Materials Science. (N.V. Philips’ Gloeilampenfabrieken, Eindhoven, 1976), p. 87.
14.Hirth, J.P., Lothe, J.: Theory of Dislocations, 2nd ed. (Krieger Publishing Company, Malabar, FL, 1992).
15.Williams, D.B., Carter, C.B.: Transmission Electron Microscopy (Plenum Press, New York, 1996), p. 405.
16.Foreman, A.J.F.: Dislocation energies in anisotropic crystals. Acta Metall. 3, 322 (1955).
17.Hazzledine, P.M., Yoo, M.H., Sun, Y.Q.: The geometry of glide in Ni3Al at temperatures above the flow stress peak. Acta Metall. 37, 3235 (1989).
18.Veyssiere, P., Douin, J.: Dislocations with 〈100〉 Burgers vectors in Ni3Al. Philos. Mag. A 51((2)), L1 (1985).

Keywords

New configuration of a [001] superdislocation formed during high-temperature creep in the γ′ phase of a single-crystal superalloy TMS-138

  • J.X. Zhang (a1), H. Harada (a1) and Y. Koizumi (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed