Morphologies of microstructure in Mg97Zn1Y2 ribbon upon ageing at different temperatures

In order to clarify the morphology of the rapidly-solidified (RS)melt-spun Mg97Zn1Y2 (at%) alloy, which has the secondary phases of long-period stackingg (LPS) structure, the ribbon was processed with the thickness of 60 mu m and the width of 7 mm, and aged (T5 heat-treated) at different temperatures. The as-spun and aged ribbons were characterized using transmission electron microscopy (TEM). X-ray diffraction (XRD) and laser optical microscopy. and micro-hardness Measurement were conducted. It is found that there was a cellular/dendritic transition during ruelt-spinning, process of Mg97Zn1Y2 alloy, and it mild age strengthening with the hardness of 113HV/0.05 at 573 K: more importantly. there was a different evolution of morphologies of the matrix and inter-metallic compounds front general secondary phase strengthened alloys when age temperatures up to the 773 K had been introduced to the as-spun alloy.