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Article Dans Une Revue Acta Metallurgica Année : 1988

Early stages of precipitation of γ′-phase in a nickel base superalloy: An atom-probe investigation

Sylvain Chambreland
A. Walder
  • Fonction : Auteur
D. Blavette

Résumé

The early stages of precipitation of γ′ phase in a nickel base superalloy have been investigated by means of atom-probe techniques. The microstructure parameters, as derived from concentration profiles, have been studied as a function of the aging time at 650°C. An analytical method is proposed for determining the particle size, the number density as well as the volume fraction from the features of concentration profiles. The results which are observed show for aging times smaller than a few hours that the precipitate composition varies in a large extent while the particle size remains nearly constant. In contrast, in the coarsening stage γ′ precipitates reach their equilibrium composition after the first 25 h. The results are interpreted within nucleation-growth and coarsening theories. \textcopyright 1988.

Dates et versions

hal-01928980 , version 1 (20-11-2018)

Identifiants

Citer

Sylvain Chambreland, A. Walder, D. Blavette. Early stages of precipitation of γ′-phase in a nickel base superalloy: An atom-probe investigation. Acta Metallurgica, 1988, 36 (12), pp.3205--3215. ⟨10.1016/0001-6160(88)90055-7⟩. ⟨hal-01928980⟩
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