Microstructural Evolution of Long-Period Stacking Ordered Structures in Mg97Y2Zn1 Alloys Examined by In-Situ Small-Angle X-ray Scattering

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 45; no. 11; pp. 4780 - 4785
• Main Authors: Okuda, Hiroshi, Horiuchi, Toshiki, Hifumi, Shoki, Yamasaki, Michiaki, Kawamura, Yoshihito, Kimura, Shigeru
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Boston Springer US 01.10.2014; Springer
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Exact sciences and technology; Materials Science; Metallic Materials; Metals. Metallurgy; Nanotechnology; Structural Materials; Surfaces and Interfaces; Symposium: Neutron and X-Ray Studies of Advanced Materials VII; Thin Films; LPSO Structure; Increase Annealing Time; LPSO Phase; Mg85Y9Zn6 Alloy; Kinetic Phase Diagram; Microstructure; Ordered alloy; In situ
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-014-2410-2

Development and stability of synchronized long-period stacking ordered (LPSO) structures in Mg 97 Y 2 Zn 1 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.