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

1
Atomic Energy Commission of Syria (AECS), P. O. Box 6091, Damascus, Syria
2
ALS–LBNL, 1 Cyclotron Road, MS 2-400, Berkeley, CA 94720, USA
3
Institut Jean Lamour, UMR 7198 CNRS Université de Lorraine, Campus Artem, 2 Allée André Guinier, BP 50840, 54011 Nancy CEDEX, France
4
Institut Pprime, UPR 3346 CNRS—Université de Poitiers-ENSMA, SP2MI, Boulevard Marie et Pierre Curie, BP30179, 86962 Futuroscope, France
*
Author to whom correspondence should be addressed.
Quantum Beam Sci. 2018, 2(4), 27; https://doi.org/10.3390/qubs2040027
Received: 31 October 2018 / Revised: 25 November 2018 / Accepted: 30 November 2018 / Published: 10 December 2018
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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. View Full-Text
Keywords: synchrotron X-ray diffraction; iron alloys; phase transformations; grain orientation; grain/phase boundaries; strain/stress measurement synchrotron X-ray diffraction; iron alloys; phase transformations; grain orientation; grain/phase boundaries; strain/stress measurement
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Al Khoury, W.; Tamura, N.; Geandier, G.; Goudeau, P. New Structural Insight into Interface-Controlled α–σ Phase Transformation in Fe-Cr Alloys. Quantum Beam Sci. 2018, 2, 27.

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