Fig. 3.

In the left half: SEM micrographs of Mg₂Si powders obtained directly by thermal annealing only (a) and after the sequence thermal annealing and 5 h milling (b); photos of extruded Mg₂Si paste made with powders formed through thermal annealing only (c) and close-up (d), respectively. In the right half: XRD diffratograms of the Mg₂Si powders (e) obtained directly by thermal annealing (pink line) and by thermal annealing and subsequent 5 h milling (gray line). For comparison, the XRD measurements obtained from powders milled for 5 h and annealed is also included (blue line)