Magnesium chips were coated with a high concentration of graphite using a binder, and then used as the raw material for thixomolding. The microstructure of the magnesium injection–molded product with the addition of graphite exhibited a dispersion of needle–like graphite. No significant voids were
observed at interfaces between the graphite and matrix. The addition of more than 0.5 massÿ graphite decreased the proof stress and tensile strength of the injection–
molded products. The Young’s modulus of graphite–added products showed a tendency to decrease with increasing addition of graphite, which was consistent with
the lower limit of the rule of composites. Compared to AZ91D, the thermal conductivity of the 6.9 massÿ graphite–added product was increased, and the coefficient of
linear thermal expansion was decreased. Both were within the ranges where the rules of mixtures were satisfied.