In Situ Investigation with Neutrons on the Evolution of γ ' Precipitates at High Temperatures in a Single Crystal Ni-Base Superalloy


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Single crystal Ni-base superalloys based on the  /  system are widely used in gas turbine applications. To understand the formation of  precipitates, including size distribution and growth, we performed in situ small-angle neutron scattering (SANS) measurements at elevated temperatures and - together with TEM as well as , SEM imaging - studied changes in the precipitates in short and long time scale. In the early stages, a bimodal precipitate size distribution of precipitate is observed, which (depending on the annealing temperature) changes to a cuboidal or nearly spherical morphology with almostmore or less uniform ( unimodal?) size distribution. [Note: The term "more or less" is several times repeated in the text. I cannot imagine what it in fact means. Could you change it or explain in a more clear way?]



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M. Heilmaier




R. Gilles et al., "In Situ Investigation with Neutrons on the Evolution of γ ' Precipitates at High Temperatures in a Single Crystal Ni-Base Superalloy", Advanced Materials Research, Vol. 278, pp. 42-47, 2011

Online since:

July 2011


[1] D. Mukherji, G. Pigozzi, F. Schmitz, O. Näth, J. Rösler and G. Kostorz: Nanotechnology 16 (2005), pp.2176-2187.


[2] R. Gilles, D. Mukherji, M. Hoelzel, P. Strunz , D.M. Toebbens, B. Barbier: Acta Mat. 54 (2006) pp.1307-1316.

[3] A. Baldan: Journal of Materials Science 37 (2002), pp.2379-2405.

[4] C.S. Jayanth, P. Nash: Journal of Materials Science 24 (1989), pp.3401-3052.

[5] P. Strunz, D. Mukherji, R. Gilles, A. Wiedenmann, J. Rösler, H. Fuess: J. Appl. Cryst. 33 (2001) pp.541-548.

[6] P. Strunz, R. Gilles, D. Mukherji, A. Wiedenmann: J. Appl. Cryst. 36 (2003) pp.854-859.

[7] R. Gilles: International Journal of Materials Research 96 (2005), pp.325-334.

[8] D. Mukherji, R. Gilles, P. Strunz, S. Lieske, A Wiedenmann and R.P. Wahi: Scripta Materialia, Vol. 41, No. 1 (1999), pp.31-38.


[9] D. Mukherji, P. Strunz, D. del Genovese, R. Gilles, J. Rösler, A. Wiedenmann: Metallurgical and Materials Transactions A, Vol. 34A (2003), pp.2781-2792.

[10] D. Mukherji and J. Rösler: International Journal of Materials Research 94 (2004), pp.478-484.

[11] http: /www. gkss. de/central_departments/genf/instruments/003124/index_0003124. html. de.

[12] G. Kostorz, in: Neutron Scattering (Treatise on materials science and technology), ed. G. Kostorz, Academic Press, New York (1979), pp.227-289.


[13] A. Guinier, G. Fournet: Small-angle Scattering of X-rays, John Wiley&Sons, Inc. (1955).