Effects Of Iron And Carbon On Physic-chemical Properties And Grinding Properties Of Cu-Zr-Ti Amorphous Alloy

The short-range ordered and long-range disordered structure of amorphous alloy makes it stand out among metal alloys.The copper-based amorphous alloy has attracted much attention due to its low cost,high strength,and excellent corrosion resistance.However,the limited amorphous forming ability and room temperature brittleness limit the application of copper-based amorphous alloy.Therefore,it is of great significance to develop copper-based amorphous alloys with better glass-forming ability and comprehensive properties.In this paper,the effects of iron and carbon microalloying on the amorphous forming ability,thermodynamics,mechanics,corrosion and grinding of Cu₅₀Zr₄₀Ti₁₀alloy are systematically studied,and the related mechanisms are discussed.The bulk water-cooled copper mold suction casting method.The amorphous structure of the material was determined by X-ray diffraction technology.The thermal properties of the material were studied by differential scanning calorimetry,the mechanical properties of the material were obtained by the unidirectional compression method and the corrosion resistance was obtained by electrochemical polarization method.The microscopic morphology was analyzed by scanning electron microscopy.The results show that the addition of iron and carbon can improve the amorphous forming ability,glass transition temperature,crystallization temperature,glass transition activation energy and crystallization activation energy of(Cu₅₀Zr₄₀Ti₁₀)_1-x（Fe C）_x（x=2.20at.%）alloy,however,the supercooled liquid region is reduced.The composition of cu-based Amorphous alloys gradually changes to eutectic or near-eutectic with the increase of iron and carbon contents.The results show that the addition of iron and carbon increases the amorphous forming ability of cu-based alloys.From the parameters,the addition of iron and carbon had no obvious effect on the parameters,and the content of iron and carbon had no obvious effect on the amorphous forming ability of cu-based alloys.The addition of iron and carbon reduces the corrosion current density of(Cu₅₀Zr₄₀Ti₁₀)_1-x（Fe C）_x（x=2.20 at.%）amorphous alloy and increases the corrosion potential.Copper-based amorphous alloys all exhibit unique sawtooth polarization behavior.With the increase of iron and carbon content,current sawtooth decreases,and its corrosion mechanism changes from pitting to self-passivation.The influence of grinding depth on surface roughness and grinding force is significant.The order of the three influencing factors on surface roughness and grinding force is grinding depth,workpiece moving speed and iron and carbon content.Taking the minimum surface roughness as the evaluation target,the theoretical optimal technological conditions are iron and carbon content of 1.32 at.%,grinding depth of 2μm and workpiece speed of 12m/min.The actual optimum technological conditions are as follows:iron and carbon content is 1.32 at.%,grinding depth is 2μm and workpiece speed is 18m/min.Taking the minimum grinding force as the evaluation target,the theoretical optimal technological conditions are:iron and carbon content is 0,grinding depth is 2μm and workpiece moving speed is 9m/min.The actual optimum technological conditions are as follows:iron and carbon content is 1.32 at.%,grinding depth is 2μm and workpiece moving speed is 18m/min.