Microstructure and Mechanical Properties of an Ultra Fine Fe-Mo-B Alloy Produced by Mechanical Alloying and Spark Plasma Sintering

摘要

A boron supersaturated Fe-Mo nanostructured solid solution was produced by Mechanical Alloying of a mixture of elemental boron and water atomized Fe-1.5Mo powders, and consolidated by Spark Plasma Sintering. The low sintering temperature, and the short sintering times allow a either nanostructured or ultra fine structure to be maintained, combined with a homogeneous and fine precipitation of boride particles. Near-full density was attained. Tensile properties were investigated and correlated to the microstructural characteristics. The ultra fine structure results in a significant hardening and strengthening of the material, coupled with a lower ductility in comparison to the conventional microstructured material.