In situ measurements on stability of long-period stacking-ordered structures in Mg85Y9Zn6 alloys during heating examined by multicolor synchrotron radiation small-angle scattering

Changes in long-period stacking-ordered (LPSO) structures in Mg85Y9Zn6 samples during heating up to melting has been examined by in situ synchrotron radiation small-angle scattering with X-rays containing higher harmonics to simultaneously obtain wide-angle diffraction spots. The 10H structure was less stable than the 18R, and the collapse of 18R and melting occurred simultaneously. The lattice parameter for in-plane ordering changes differently from the others with temperature, suggesting that the average structure of the in-plane order changes during heating.