Journal
PHILOSOPHICAL MAGAZINE
Volume 83, Issue 26, Pages 3005-3027Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/1478643031000149108
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We report in-situ measurement of both ( 200) and ( 002) diffraction profiles ( parallel and perpendicular to the tensile axis) and of the lattice mismatch of the AM1 superalloy during a tensile creep experiment ( 150 MPa; 1080 degreesC). The measurements were made by high-resolution high-energy X-ray diffraction at the ID 15A beam line of the European Synchrotron Radiation Facility. Peak shape and lattice mismatch have well-defined non-monotonic behaviours clearly related to the evolution of the microstructure ( rafting, ripening and encapsulation of the gamma phase) and the different stages of the creep curve. Modelling of the raft microstructure as a multilayer gives a good description of the experimental parameters ( peak shape and lattice mismatch) during stage II, and a qualitative explanation of their behaviour during stage III.
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