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The effect of room temperature pre‐strain on grain boundary cavitation in Nimonic 8oA
Author(s) -
Dyson B. F.,
Henn D. E.
Publication year - 1973
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1973.tb03771.x
Subject(s) - nimonic , cavitation , grain boundary , materials science , creep , alloy , tension (geology) , metallurgy , composite material , superalloy , mechanics , microstructure , ultimate tensile strength , physics
SUMMARY Specimens of the alloy Nimonic 80A have been pre‐strained 11% in tension at room temperature and then heated to 750°C for various times either with or without the application of stress. Examination by means of a high voltage electron microscope revealed large numbers of spherical submicron diameter cavities. The cavities all lay on grain boundaries but were inhomogeneously distributed; a grain boundary usually contained either many cavities or none at all. It is concluded that the cavitation is a direct result of decohesion at the grain boundaries during the pre‐straining and not due to any creep process.