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The role of microstructural morphology on creep properties of a [0 0 1] oriented nickel‐base single crystal superalloy
Author(s) -
Wang X.M.,
Wang X.Z.,
Wang Y.
Publication year - 2018
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201700113
Subject(s) - superalloy , microstructure , materials science , creep , nickel , phase (matter) , stress (linguistics) , alloy , rectangle , metallurgy , composite material , crystallography , geometry , chemistry , mathematics , linguistics , philosophy , organic chemistry
The experimentally observed microstructure of nickel‐base single crystal alloy consists of a large volume of cuboidal γ′ precipitates coherently embedded in the γ matrix. In calculation, a representative volume element is usually used to represent the whole structures due to the regular γ/γ′ topological structures. Here, three experimentally found microstructures have been extracted to generate the representative volume elements. One is constituted by one cuboidal γ′ phase surrounded by γ phase. The other two consisted of two cuboidal γ′ phases and one rectangle γ′ phase with different arrangement of the two γ′ phases. The misfit stress is taken into consideration by different thermal expansion coefficients of the two phases. The influences of different microstructures on the macro‐creep strain evolution, rafting and stress distributions are discussed.