Abstract
The AM30 alloy experiences remarkable grain refinement through carbon inoculation, resulting in a significant reduction of grain size from 623±21μm to 82 ± 2 μm. To delve into the influence of Mn on carbon inoculation in the presence of Ca, advanced techniques such as EDS, FIB, and TEM were utilized. This study reports the initial discovery of a unique duplex-phase particle characterized by an amorphous carbon layer coating on the Al8Mn5 phase. Notably, the amorphous layer exhibits a thickness of approximately 100 nm. These distinctive duplex-phase particles are hypothesized to serve as effective nuclei for Mg grains. Supported by epitaxial growth theory and experimental data, these particles exhibit remarkable nucleation efficiency.
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