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Al-TGC grain-refining master alloys are of increasing importance in aluminium casting because they are believed to introduce a smaller volume fraction of insoluble particles into the melt than conventional Al-Ti-B master alloys are. The main microstructural features of an Al-6wt.%Ti-0.02wt.%C master alloy have been examined using X-ray diffraction and optical, scanning and transmission electron microscopy...