Interaction of the precipitation kinetics of δ and γ' phases in nickel-base superalloy ATI Allvac® 718Plus™

Rene Radis, Gerald A. Zickler, Martin Stockinger, Christof Sommitsch, Ernst Kozeschnik

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review


In this paper, the precipitation behaviour of δ (Ni 3(Nb,Al)) and γ' (Ni3(Al,Ti,Nb)) phases in the nickel-base superalloy ATI Allvac® 718Plus™, as well as their kinetic interactions are discussed. Important parameters such as volume fraction, mean radius and number density of precipitates are experimentally determined and numerically simulated as a function of the heat treatment parameters time and temperature. To match the experimentally observed kinetics, the predicted interfacial energy of the precipitates, as calculated for a sharp, planar phase boundary, is adjusted to take into account the interfacial curvature and entropic effects of a diffuse interface. Correction functions for the interfacial energies of δ as well as γ' precipitates are presented. Using these modified interfacial energies, the calculated results show excellent agreement with the experimental measurements.

Original languageEnglish
Title of host publicationTHERMEC 2009
Number of pages6
Publication statusPublished - 9 Feb 2010
Event6th International Conference on Processing and Manufacturing of Advanced Materials - Berlin, Germany
Duration: 25 Aug 200929 Aug 2009

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476


Conference6th International Conference on Processing and Manufacturing of Advanced Materials
Abbreviated titleTHERMEC 2009



  • ATI Allvac® 718Plus™
  • Delta
  • Gamma prime
  • Precipitation kinetics
  • Superalloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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