Temporal evolution of non-equilibrium γ′ precipitates in a rapidly quenched nickel base superalloy

被引：7

作者：

Rojhirunsakool, T. ^{[1
]}

Singh, A. R. P. ^{[1
]}

Nag, S. ^{[4
]}

Hwang, J. Y. ^{[2
]}

Tiley, J. ^{[3
]}

Banerjee, R. ^{[1
]}

机构：

[1] Univ N Texas, Dept Mat Sci & Engn, Ctr Adv Res & Technol, Denton, TX 76203 USA

[2] Korean Inst Sci & Technol, Carbon Convergence Mat Res Ctr, Taejon, South Korea

[3] Air Force Res Lab, Dayton, OH USA

[4] GE Global Res Ctr, CMT Struct & Funct Met Lab, Niskayuna, NY USA

来源：

INTERMETALLICS | 2014年 / 54卷

基金：

美国国家科学基金会;

关键词：

Annealing; Order/disorder transformation; Phase transformation; Microstructure; Atom probe; Electron microscopy transmission; 3-DIMENSIONAL ATOM-PROBE; SPINODAL DECOMPOSITION; PHASE-SEPARATION; SIZE DISTRIBUTIONS; NONUNIFORM SYSTEM; TITANIUM ALLOYS; FREE ENERGY; AL; STAGE;

D O I：

10.1016/j.intermet.2014.06.011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The temporal evolution of non-equilibrium gamma' precipitates in a rapidly quenched and isothermally annealed commercial nickel base superalloy has been investigated by coupling transmission electron microscopy and atom probe tomography. When subjected to rapid quenching from above the gamma' solvus temperature, the supersaturated single phase gamma matrix appears to undergo compositional phase separation possibly via spinodal decomposition to form solute-rich and solute-depleted regions. The regions that have a depletion in Cr and Co undergo an ordering process resulting in the gamma' domains which exhibit a far from equilibrium composition. Upon isothermal annealing, the gamma/gamma' interface sharpens and the compositions of both gamma and gamma' phases approach equilibrium. The influence of a non-classical mechanism of gamma' precipitation on the size distribution of precipitates as well as the precipitate and matrix compositions, and its subsequent evolution during isothermal annealing has been discussed. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：218 / 224

页数：7

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