Grain Refinement of AZ91D Magnesium Alloy by In Situ Al4C3 Particles
Experiments were conducted to fabricate the Al4C3 particles by powder in-situ synthesis process under argon atmosphere and examine the grain refinement of AZ91D magnesium alloy with the addition of 0.6%Al4C3(hereafter in mass fraction,%). By means of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS), the results show the successful fabrication of Al4C3 particles. After adding 0.6%Al4C3, the average grain size of AZ91D magnesium alloy decreased from 360μm to 243μm. Based on the differential thermal analysis (DTA) results and calculations of the planar disregistry between Al4C3 and α-Mg, Al4C3 particles located in the central regions of magnesium grains can act as the heterogeneous nucleus of primary α-Mg phase.
Shiquan Liu and Min Zuo
H. Han et al., "Grain Refinement of AZ91D Magnesium Alloy by In Situ Al4C3 Particles", Advanced Materials Research, Vols. 306-307, pp. 429-432, 2011