Synthesized By The Reaction Of Cu / Of Fes Complex Homogeneous-phase Composite And Performance

The metal-matrix solid self-lubricating materials,which are fabricated from solid lubricating material and copper,have caused great interest in the world due to their attractive tribological properties.As a group of high performance materials,it is very significance in saving energy,prolonging use life and improving reliability.Crystal structure of FeS is hexagonal structure,so it is a good solid lubricating material.In the thesis,four different component Cu/FeS composite materials are fabricated by in-situ method,and the raw materials were CuS,copper alloy and Cu.In four spemens,the mass percent of FeS were 5%,10%,15%and 20%respectively in theory.The outcome which is analyzed by XRD and EDAX has three substances including Cu,FeS and Fe₂O₃. They are processed by the plastic deformation.The microstructure and physical performance of Cu/FeS materials are studied in different stage.Recrystallization of Cu/FeS materials are studied too.By analyzing the evolution of the microstructure of Cu/FeS materials,it is founded that the plastic deformation is beneficial to improve the microstructure of materials.Before plastic deformation,FeS particles get together as patch and ring,however,after it,the FeS particles become tinier and distribute homogenously in the Cu matrix.So that the microstructure homogenization is realized.Tensile fracture surfaces are observed.Dimple fracture is the main fracture mode of Cu/FeS materials,and the dimples are more bulky and pockety.With the true strain increasing,the dimples are smaller and homogenously more and more.It is related the situation that FeS particles distribute in Cu matrix.Cu/FeS materials are processed with the true strain of 4.0,7.2 and 9.6.The relative density increases obviously,the hardness declines ultimately and conductivity has a little ruleless change.With the true strain increasing,the tensile results prove that the tensile strength increases in the main and percentage elongation raises a little.With the mass percent increasing of FeS,the relative density,conductivity and percentage elongation decline,but the hardness increases.We research dynamic recovery and dynamic recrystallization of Cu/FeS materials in the process of elevated temperature plastic deformation.The results prove that Cu matrix grains of hot-press specimens are bulky unconventionally,and with the true strain increasing,the matrix grains become more tiny obviously which is beneficial to improve the distributing of FeS in Cu matrix.By annealing research of specimens after plastic deformation,we know that dispersed FeS particle with small size and space in Cu matrix obstruct recrystallization of Cu matrix effectively,leading to improvement of the softening temperature.In the same experiment condition,the softening temperature of Cu/FeS materials is much higher with the mass percent increasing of FeS and elevated temperature property is much steadier with the true strain increasing.