Mechanical properties and microstructure of Al_2O_3/WC - 8Co nanometer/micron composites
YANG Mei
LIU Qing-cai
HUANG Zhi-qiang
LIU Qing-you
Abstract：Al_2O_3/WC-8Co nanometer/micron composites, doped nanometer Al_2O_3 into micron WC-8Co,were prepared to investigate the effects of nanometer Al_2O_3 particles on the mechanical properties and microstructure of WC-8Co.Density, bending strength, micro-hardness, impact toughness and wear resistance of the composites were tested, and microstructure was characterized by means of scanning electron microscopy (SEM). The results show that mechanical properties of the composite doping 3% nano Al_2O_3 and 0. 8% RE are improved, especailly its weight-loss decreases about 10/11 of WC-8Co. The grain of Al_2O_3/WC-8Co nanometer/micron composite is apparently refined,the fracture mechanism is microvoid coalescence fracture because the fractography is tough fracture.
Keywords：nanometer/micron compositesadulterationmechanical propertiesmicrostructure
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 494-497 )