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New Structural Insight into Interface-Controlled α–σ Phase Transformation in Fe-Cr Alloys

By Wael Al Khoury, Nobumichi Tamura, Guillaume Geandier and Philippe Goudeau


Synchrotron Laue microdiffraction scanning is used for the ex situ study of the body-centered, cubic-to-tetragonal phase transformation that occurs in equiatomic polycrystalline Fe-Cr alloys at temperatures between 550 and 800 °C. Grain orientation and grain strains were scanned with a micron step resolution after annealing at 700 °C for 12 h. Further microstructural details on the early stage of the transformation, and more particularly on the cubic-to-tetragonal phase interface, were achieved. Only the α and ordered σ phases were detected. The crystallographic relationships at the interface between the two phases did not follow the predicted rules; this result is discussed in relation to the measured microstrains

Topics: synchrotron X-ray diffraction, iron alloys, phase transformations, grain orientation, grain/phase boundaries, strain/stress measurement, Technology, T, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Publisher: MDPI AG
Year: 2018
DOI identifier: 10.3390/qubs2040027
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