Study On Amorphous Formation Ability And Mechanical Properties Of Zr-Cu-Al Alloy Intermetallic Compound ?3

In recent years,amorphous alloys have received extensive attention due to their excellent strength,hardness,corrosion resistance,and elastic limit,as well as excellent processability in the supercooled liquid region.Among them,Zr-based amorphous alloys have the excellent properties of amorphous alloys,strong amorphous forming ability,and relatively cheap price,and have more research value.However,how to make larger amorphous alloys by simpler methods and how to improve the plasticity of amorphous alloys have been two major problem limiting the wide application of amorphous alloys.Therefore,the research content of this thesis is mainly from the two aspects of the formation ability and compressive mechanical properties of amorphous alloy.Study on the amorphous forming ability,amorphous content and size and mechanical properties of alloys in the vicinity of intermetallic compound?3(Zr₅₁Cu₂₈Al₂₁)in Zr-Cu-Al alloy system.By analyzing the components of the intermetallic compound?3 by XRD and DSC,the amorphous forming ability of the alloy in the vicinity thereof is determined.Some samples were selected for room temperature compression,and the stress-strain curve of the compression test was obtained.The fracture morphology was analyzed by scanning electron microscopy.Summarize the relationship between amorphous content and size and mechanical properties.By studying the amorphous forming ability of 3at.%of the alloys in the vicinity of the intermetallic compound?3(Zr₅₁Cu₂₈Al₂₁)in the Zr-Cu-Al ternary alloy system,it was found that a diameter of 1 at.%in the vicinity of the intermetallic compound?3can be obtained.1 mm bulk amorphous alloy.In the upper right part of the?3 point,the formation ability is particularly poor,and a bulk amorphous alloy cannot be obtained,and a bulk amorphous alloy having a diameter of 1 mm or more can be obtained at the lower left of the?3 point,and as the Zr content increases,The amorphous forming ability is gradually enhanced,and the formation ability is best in the vicinity of Zr₅₄Cu₂₈Al₁₈ composition,and a bulk amorphous alloy with a diameter of 2 mm can be obtained.Exploring the relationship between amorphous content and size and mechanical properties,it was found that for each sample with a forming ability of 1 mm near the intermetallic compound?3,the greater the enthalpy of crystallization,the more amorphous the amorphous alloy,the plasticity.The better the deformation ability.The smaller the size of the Zr₅₄Cu₂₈Al₁₈ amorphous alloy,the smaller the size,the greater the cooling rate during solidification,and the better the plastic deformation ability.