The study results showed that the effect of pressed - sintered parameters on microstructure and properties of composite Cu - nano Al2O3 dispersed such as microstructure and density, hardness. Also, the results demonstrated that nano Al2O3 can be able to synthesize by a mechanochemical process in attritor balls milling. Keywords: mechanochemical, Cu-Al2O3, dispersion, X-ray diffraction, SEM, microstructure. | Nguyễn Đức Duy và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 139(09): 47 - 51 SYNTHESIS OF NANO Al2O3 DISPERSION - STRENGTHENED Cu MATRIX COMPOSITE MATERIALS BY MECHANOCHEMICAL PROCESS Nguyen Duc Duy1,2, Tran Van Dung1, Nguyen Dang Thuy1, Ho Ky Thanh1,3* 1 Ha Noi University of Science and Technology 2 College of Mechanics and Metallurgy 3 College of Technology - TNU SUMMARY Mechanochemical method was used to synthesize nano Al2O3 dispersion - strengthened Cu matrix composite materials. Nanocomposite powders of Cu - Al2O3 were produced by milling at room temperature in attritor mill using mixtures of CuO, Al and Cu powder ingredients. The nanocomposite powders Cu - Al2O3 were cold pressed into briquettes and then conventionally sintered at various temperatures (from 700 C to 900 C) and time (from 1 to 3 hours). The results were analyzed by x-ray diffraction (XRD) and scanning electron microscope (SEM) with energy dispersive spectrometer (EDS) showed that nano - sized Al2O3 ultrafine particles of about (50 ÷ 100) nm was formed and uniformly dispersed into Cu matrix. The study results showed that the effect of pressed - sintered parameters on microstructure and properties of composite Cu - nano Al2O3 dispersed such as microstructure and density, hardness. Also, the results demonstrated that nano Al2O3 can be able to synthesize by a mechanochemical process in attritor balls milling. Keywords: mechanochemical, Cu-Al2O3, dispersion, X-ray diffraction, SEM, microstructure INTRODUCTION* Composites are materials consisting of two or more components with different properties and distinct boundaries between them. Intensive research over the last two decades has led to the emergence of composites as a new class of engineering materials that provide enhanced combination of high temperature strength and acceptable levels of ductility, toughness, fatigue resistance required for a variety of applications. Metal matrix composites (MMCs) are one of the groups of such type of materials.
