Mechanical Properties of Hot-Pressed Compacts Made by Alumina Particle Dispersion Magnesium Powders

摘要

To enhance the mechanical properties of Mg alloys, powders of pure Mg (A dispersed with over 10 vol% Al_2O_3 particles were formed by ball milling powder mixtures of pure Mg and Al_2O_3 particles with particle sizes of 0.3 and 1 μm. The effect of the Al_2O_3 content of hot-pressed discs of Al_2O_3/Mg powders on the mechanical properties was investigated. The hardness increased sharply at certain Al_2O_3 content. This is considered to be because of the development of Al_2O_3 particle strengthening due to the excellent interfacial bonding between Mg and Al_2O_3 particles when the Al_2O_3/Mg discs contain a sufficient amount of Al_2O_3 particles and have a sufficient interparticle distance. The maximum hardness was 220 HV. The tensile strength increased as Al_2O_3 content was increased. The Al_2O_3/Mg plate with Al_2O_3 particles sizes of 0.3 and 1 μm indicated maximum values of the bending strength at 10 and 14vol%Al_2O_3 content, respectively.