| The vacuum-magnetic levitation smelting water-cooled copper mold process to prepare Fe-15Mn-5Si-10Cr-0.2C,Fe-15Mn-5Si-10Cr-0.2C-1.0RE（Y,Nd,Ce,Dy）and(Fe0.34Cu0.47Si0.19)95Al5 amorphous composite sample.The research contents include:microstructure,macroscopic mechanical properties,micro-mechanical properties of Fe-15Mn-5Si-10Cr-0.2C amorphous composites and the effects of addition of Y,Nd,Ce,Dy on the properties of the constituent alloys;Fe-15Mn-5Si-10Cr-0.2C amorphous composite materials with different friction conditions,friction properties in the medium;annealing treatment of(Fe0.34Cu0.47Si0.19)95Al5 composite structure and mechanical properties.The material was analyzed and characterized by XRD,OM,SEM,universal capability test machine,and nano indentation.The following co nclusions were obtained:（1）The microstructure of as-cast Fe-15Mn-5Si-10Cr-0.2C alloy is amorphous matrix+singleγaustenite phase.At the same time,the volume fraction of crystal phase increases from surface to surface,and the morphology changes from tiny dendrite to coarse dendrite.During the room temperature compression process,due to the TRIP effect,it exhibits excellent comprehensive mechanical properties（breaking strength of2900 MPa,plastic strain of 30.02%）,and the fracture morphology confirms its good plastic toughness.In the micro-mechanical properties,the material shows that the surface amorphous structure is harder than the central crystal and the transition zone,and the plastic deformation and nano-hardness show opposite trends.All regions of the alloy have obvious creep behavior.The energy dissipation factor and creep deformation of the alloy show the changing trend of central area>transition area>marginal area.The structure of Fe-15Mn-5Si-10Cr-0.2C-Re is all amorphous+crystalline composite structure,and the crystal phase is singleγaustenite.Among them,alloys with Re=1 Y exhibited goodγ-austenite phase while exhibiting good amorphous-forming ability.And the alloy sample has the best comprehensive mechanical properties,fracture strength and elastic modulus were 3280MPa,respectively,and the plastic deformation capacity of the alloy also performed well,the plastic strain was 31.23%.And its fracture morphology confirmed its good plastic toughness.（2）Under the condition of dry friction,the wear mechanism of Fe-15Mn-5Si-10Cr-0.2C amorphous alloy is fatigue and abrasive wear.With the increase of the load,the friction coefficient becomes smaller and shows excellent wear resistance at room temperature.When the wet friction medium is an artificial seawater solution,the wear mechanism of Fe-15Mn-5Si-10Cr-0.2C/Si3N4 is fatigue and corrosion wear.As the load increases,the frictional wear coefficient becomes smaller,and cracks and pits appear on the surface of the specimen.Compared with crystalline alloys,Fe-based amorphous alloy composites with the same composition have good wear resistance and corrosion resistance,exhibit good wear resistance in the atmosphere and artificial seawater,and are a potential high strength.Wear-resistant steel.（4）After(Fe0.34Cu0.47Si0.19)95Al5 is annealed at low temperature,the compressive fracture strength and Vickers hardness increase,and the plasticity slightly decreases;for the high-temperature annealing sample,as the annealing process proceeds,due to amorphous The orderliness of the atomic arrangement and the degree of synergy of the motion increase in the state alloy,the free volume annihilation,and the ordering of the structure will lead to the embrittlement of the amorphous alloy,so the performance at high temperature annealing decreases.After the annealing treatment,the disorder microstructure in the microstructure is high,and the microstructure changes little during annealing,which has little effect on the plasticity and ductility of the alloy.After proper annealing,the hardness and thermal stability of the alloy are improved,and the annealing process can improve the performance of the amorphous alloy composite. |
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