Microstructure and thermal stability of Al2O3-20vol%Fe48Co52composite powder particles prepared by high energy mechanical milling

High energy mechanical milling of a mixture of alumina and nanostructured Fe 48 Co 52 powders was used in producing an Al 2 O 3 -20vol%Fe 48 Co 52 composite powder. The milling time ranged from 8 to 48 hours. The microstructural changes were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD analysis of the powder showed significant reduction in Al 2 O 3 grain size after 24h milling to 27nm and approaching the alloy grain size with further milling. However, the alloy particles demonstrated almost unchanged grain size throughout the process. As milling progressed, changes of alloy particles shapes and their location in alumina phases became apparent. After 24h, a small fraction of Al 2 O 3 particles became embedded into the alloy particles, forming a complex composite structure. Small change in the microhardness of the particles was observed. It was also observed that the Fe 48 Co 52 particles and Al 2 O 3 matrix reacted heavily when the powder was heated to 1050 0 C.