Effect of Second-Phase Particles on Grain Refinement of Mg-Al-Zn Alloy during ECAE
The effect of second-phase particles on the grain refinement of AZ61 and AZ91 Mg-Al-Zn alloys with different volume fractions of β-Mg17Al12 phase particles during equal channel angular extrusion (ECAE) has been investigated. The microstructure were observed by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), which revealed that grain refinement was enhanced by second phase particles at initial stage of ECAE. And finer grains with the high angle grain boundaries (HAGBs) and disperse second-phase particles could be obtained in AZ61 and AZ91 after 8 passes of ECAE.
Yafang Han et al.
L. Jin et al., "Effect of Second-Phase Particles on Grain Refinement of Mg-Al-Zn Alloy during ECAE", Materials Science Forum, Vols. 546-549, pp. 315-318, 2007