Microstructural Evolution of Long-Period Stacking Ordered Structures in Mg97Y2Zn1 Alloys Examined by In-Situ Small-Angle X-ray Scattering
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Development and stability of synchronized long-period stacking ordered (LPSO) structures in Mg97Y2Zn1 alloy were examined by synchrotron-radiation small- and wide-angle scattering/diffraction measurements. The main LPSO structure in the as-cast polycrystalline ingot was 18R, and 14H structure grew at the cost of 18R during annealing. The in-plane peak position increased for longer annealing times in isothermal annealing and also at higher temperatures during in situ heating measurements, and it was interpreted by a composition of peaks corresponding to several sites. The experimental instability temperatures obtained by in situ measurements for in-plane ordering, 18R, and 14H structures agreed within experimental resolution.
KeywordsIncrease Annealing Time LPSO Phase LPSO Structure Mg85Y9Zn6 Alloy Kinetic Phase Diagram
The present work was supported by a grant-in-aid for scientific research on innovative areas, “Synchronized Long-Period Stacking Ordered Structure,” from the Ministry of Education, Science, Sport and Culture, Japan (Grant No. 23109005). Small-angle scattering measurements were made under Proposal Nos. 2012G118 at Photon Factory, KEK, and 2013A1447 and 2013B1383 at SPring-8.