Abstract
The evolution of intermetallic compounds for Al/Fe in situ composites fabricated by the plasma synthesis method (PSM) was investigated through the microstructural analyses for the partially reacted particle region. The partially reacted particle is composed of Al/Al 13Fe 4/Al 5Fe 2/Fe layer. Based on the concept of effective free energy of formation, the first phase that nucleates on the interfacial layer of Al/Fe is determined as Al 13Fe 4. By the reaction of Al 13Fe 4 and Fe, Al 5Fe 2 forms and grows inward. Due to heat extraction by the reaction, the edge of Al 13Fe 4 dissolves to form angular Al 13Fe 4 in the matrix. By the reaction and decomposition of Al/Fe through the intermediate phase of Al 5Fe 2, the Fe particles transform to Al 13Fe 4 in the plasma synthesis method. In addition, the differences of main intermetallic compounds between by the hot dipping process and by the plasma synthesis method were discussed.
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