The Fe-Ni compact bodies were fabricated using Fe-Ni mixed powders with 50 nm in diameter by injection molding process. The relationship between microstructure and material properties was characterized with respect to the volume ratio of powder/binder and sintering temperature with SEM and TEM. In the compact body having the volume percent ratio of 45(Fe-Ni) : 55(binder), which was sintered at $900^{circ}C$ the values of relative density and hardness were low about $97.7\%,$ and 277.1 Hv, respectively. Using the composition of 50(Fe Ni) : 50(binder) and sintered at $900^{circ}C,$ the values of relative density and hardness were $98.5{\%},;294.4 Hv,$ respec-tively. The grain size of sintered bodies strongly depended on the sintering temperature. In both samples sintered at $600^{circ}C;and;900^{circ}C,$ the average grain sizes were about 150 nm and 500 nm in diameter, respectively.http://society.kisti.re.kr/~kbslis )를 참조하십시오.???