Research / 2019 / Article / Fig 3

Review Article

Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials

Figure 3

(a). X-ray diffraction patterns of the Fe42Ge28Zr10B20 powder blend milled for 10 and 60 h. While the powder milled for 10 h shows the presence of an amorphous phase, the powder milled for 60 h shows the presence of a crystalline phase coexisting with the amorphous phase suggesting that the amorphous phase has crystallized. (b) Hypothetical free energy vs. composition diagram to explain the mechanism of mechanical crystallization in the Fe42X28Zr10B20 system. Note that point “1” represents the free energy of the blended elemental powders. Similarly, point “2” represents formation of the α-Fe solid solution containing all the alloying elements in Fe, point “3” formation of the homogeneous amorphous phase, point “4” a mixture of the amorphous phase with a different solute content (amorphous) from that at “3” and the solid solution α-Fe with different solute content, and point “5” the equilibrium situation when the solid solution and intermetallic phases coexist.