Rafting and elastoplastic deformation of superalloys studied by neutron diffraction

SCRIPTA MATERIALIA

卷:134

Article

Coakley, James^1,2  Lass, Eric A.³  Ma, Dong⁴  Frost, Matthew⁵  Seidman, David N.¹  Dunand, David C.¹  Stone, Howard J.² 

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

[2] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England

[3] Natl Inst Stand & Technol, Mat Sci & Engn Div, Gaithersburg, MD 20899 USA

[4] Oak Ridge Natl Lab, Chem & Engn Mat Div, Neutron Sci Directorate, Oak Ridge, TN 37831 USA

[5] Oak Ridge Natl Lab, Instrument & Source Div, Oak Ridge, TN 37831 USA

关键词: Neutron diffraction;    Superalloy;    Rafting;    Yield phenomena;    Elastic behaviour;   

DOI  :  10.1016/j.scriptamat.2017.03.007

来源: Elsevier

【 摘 要 】

The rafting of monocrystalline Ni- and Co-based superalloys has been studied by neutron diffractometry. Lattice parameter misfit values and the difference in phase stiffnesses at room temperature, 650 degrees C, and 900 degrees C are presented. These microstructural parameters should assist in refining computer models that aim to predict precipitate evolution in superalloys and aid future alloy design. The nature of rafting is shown experimentally to be dependent upon the lattice parameter misfit. The 900 degrees C yield strength of the gamma-phase of the Co-based superalloy with a rafted microstructure occurs at similar to 100 MPa, when loaded at a low strain rate. (c) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free