In situ measurement of the lattice parameter mismatch of a nickel-base single-crystalline superalloy under variable stress

✍ Scribed by A. Jacques; F. Diologent; P. Bastie

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 109 KB
• Volume: 387-389
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2003.12.080

✦ Synopsis

The evolution of the lattice parameters of the ␥ matrix and ␥ precipitates was measured in situ during high temperature tests of specimens with a raft microstructure at 1080 • C under variable load (0-300 MPa), done at the ESRF. Under low applied tensile stresses, the behavior of the specimens is purely elastic, while under stresses higher than the pre-strain stress plastic deformation takes place and results in changes of the effective lattice mismatch at the ␥/␥ interfaces. Modeling suggests a linear dependence of the lattice mismatch versus the applied stress, which is observed during the experiment.