Study On Mg-based Amorphous Composites

As the demand of modern society for higher performance metal materials is becoming more and more urgent,the bulk amorphous alloy material with unique excellent performance has gradually become the focus of people undefined research.In this paper,a completely amorphous Mg₆₀Cu₃₀Y₁₀?at%?bulk amorphous alloy material was prepared by vacuum casting.The material was subjected to room temperature compression test using an Instron-5982 universal testing machine,and the characterization and analysis of the microstructure of the material were carried out by X-ray diffraction?XRD?and scanning electron microscope?SEM?.The thermodynamic properties of the materials were analyzed by differential scanning calorimetry?DSC?.The room temperature compressive strength of the as-cast amorphous alloy samples is as high as 833MPa,and the brittle fracture is presented.The XRD spectrum of as-cast material does not have a sharp diffraction peak,and a diffuse scattering region is present at 2 nm=40.The DSC curve shows a two-stage crystallization process of a sample.The different temperature-raising rates of the samples were measured by DSC,and the calculation of the Loosocka and Kissinger methods was carried out according to the measured characteristic temperature.The value of the characteristic constant calculated by the Looska method is relatively large,which indicates that the temperature-raising rate of the alloy is sensitive and the dependence is strong for the crystallization process.The apparent activation energy of each characteristic temperature was calculated according to the Kissinger method.The as-cast samples were subjected to a heat treatment at 170.degree.C.for 5 min,10 min,and 15 min to partially crystallize the prepared amorphous alloy.The samples of the heat-treated state were subjected to room temperature compression treatment.The compressive strength of the heat-treated sample is improved,and the maximum value of 977 MPa is reached after the heat treatment for 10 min.The sample compression fracture of as-cast and heat-treated states was observed by SEM.It can be seen that as-cast and heat-treated for 5min,the number of fracture shear zones of the material with heat treatment for 10min is obviously increased,and the maximum is reached at the time of heat treatment for 10 minutes,and a small amount of precipitated phase can be seen,and a partial shear band delivery phenomenon is present.The shear band was significantly reduced at 15 minutes of heat treatment.