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

Abstract : 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
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https://hal.univ-lorraine.fr/hal-01987657
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Submitted on : Monday, January 21, 2019 - 11:30:44 AM
Last modification on : Friday, June 28, 2019 - 5:00:11 PM

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Wael Al Khoury, Nobumichi Tamura, Guillaume Geandier, Philippe Goudeau. New Structural Insight into Interface-Controlled α–σ Phase Transformation in Fe-Cr Alloys. Quantum Beam Science, 2018, 2 (4), pp.27. ⟨10.3390/qubs2040027⟩. ⟨hal-01987657⟩

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