Abstract
A highly compact Inconel 718 alloy was fabricated by spark plasma sintering (SPS) and a solution-aging treatment using the Inconel 718 powder produced by plasma rotation electrode process (PREP). The final sample exhibited high relative density and a compressive yield strength of 1349 MPa. The SPSed samples retained good sinterability and had obvious secondary densification during solution treatment and aging. Transmisson electron microscopy (TEM) analysis revealed that the main strengthening phases were nanosized γ” and γ’ precipitations that were perfectly coherent with the matrix. The densification kinetics during SPS process relating to the powder particle deformation rate were revealed by the model of Granger and Guizard. The results revealed a densification rate of 1.3 × 10−3 s−1 during SPS, far beyond other processing methods. In addition, the densification mechanism during solution treatment and aging is considered equally to a secondary sintering.
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