급냉응고 AI-20Si-5Fe-2Ni 합금의 조직, 경도 및 마모특성에 관한 연구

A Study on the characteristics of microstructure, hardness and wear of rapidly solidified AI-20Si-5Fe-2Ni materials

Characteristics of microstructure, hardness and wear of two AI-20Si-5Fe-2Ni materials produced by powder metallurgy and spray forming respectively were studied at temperatures up to 560$^{\circ}C$. Above 300$^{\circ}C$, the microstructure of powder processed alloy became inhomogenous, whereas the spray formed alloy showed homogeneous microstructures. Hardness of both alloys was increased between 300$^{\circ}C$~490$^{\circ}C$ in both alloy. It was interpreted that increase in hardness was mainly related to the formation of stable and fine intermetallic phase from metastable one. It was showed that hoogenity of microstructure in the rapidliy soldified affected directly wear property.