Influence of Extrusion Temperature on Microstructure and Properties of TC4p/ZK60 Composites
TC4p/ZK60 magnesium matrix composites were prepared by melt stirring casting,and effects of extrusion temperature on microstructure and properties of TC4p/ZK60 magnesium matrix composites were investigated.The results indicate that a portion of TC4p is dissolved during the process,and partial Ti and V elements are diffused into Mg matrix,which fail to form new phases with the elements in matrix.Zn element tends to accumulate at the interface between TC4p particles and the substrate to generate a large number of fine MgZn2 phase.After extrusion,partial recrystallization occurs inside the composites,and the degree of recrystallization around the particles varies with the extrusion temperature,exhibiting a higher degree of recrystallization along the extrusion direction than that of ones along perpendicular direction.Within 200～300℃,the degree of recrystallization of the composites and grain size are increased as extrusion temperature increases,leading to a reduction in strength and rise in elongation.When the extru-sion temperature is 200 oC,the tensile strength,yield strength and elongation of TC4p/ZK60 composites reach 394.6 MPa,353.6 MPa and 2.8%,respectively.
Metal ParticlesMagnesium Matrix CompositeExtrusion TemperatureMechanical Properties
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