Insights from a minimal model of dislocation-assisted rafting in single crystal Nickel-based superalloys

SCRIPTA MATERIALIA

卷:123

Article

Wu, Ronghai¹  Sandfeld, Stefan¹ 

[1] Univ Erlangen Nurnberg, Dept Mat Sci, Inst Mat Simulat, Dr Mack Str 77, D-90762 Furth, Germany

关键词: Superalloy;    Rafting;    Phase-field model;    Continuum dislocation dynamics;    Microstructure;   

DOI  :  10.1016/j.scriptamat.2016.05.032

来源: Elsevier

【 摘 要 】

Nickel-based superalloys play a major role in many technologically relevant high temperature applications. Understanding and predicting the evolution of the phase microstructure during high temperature creep together with the evolution of the dislocation microstructure is a challenge that up to date has not yet been fully accomplished. Our two-dimensional coupled phase-field/continuum dislocation dynamics model explains microstructural mechanisms which are important during the early stage of rafting in a single crystal system. It shows how gamma/gamma' phases and dislocations interact giving rise to realistic creep behavior; no phenomenological fit parameters are required. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free