Study Of Preparation For Amorphous Alloy Shaped Charge Liner And High Temperature Flow Behavior

Compared with crystalline materials,Hf-based amorphous alloys do not have dislocations and crystal grains,so they have excellent mechanical properties,and the series of amorphous alloys have a higher density,which is a potential drug-type cover material.However,Hf-based amorphous alloys have problems such as strong glass-forming ability and high density that cannot coexist,almost no plasticity at room temperature and difficult to process,which restricts the application of Hf-based amorphous alloys as shaped charge liner materials.In order to improve its glass-forming ability,this paper takes the Hf30Be18Ti16Zr16Cu7.5Ni12.5 amorphous alloy with a density of 8.7932 g/cm3 as the basis,and improves the glass-forming ability of the Hf-based amorphous alloy by changing the alloying element Cu/Ni ratio,developed Hf-based amorphous alloy with high glass forming ability and high density,preparation of amorphous alloy shaped charge liner.And the deformation behavior of Hf-based amorphous alloys in the supercooled liquid region is studied,and the influence of deformation conditions on crystallization and rheological behavior is analyzed,which provides technical support for the further precision processing of amorphous alloys.The main research results are as follows:(1)The effect of Cu/Ni ratio on the glass forming ability of Hf-based amorphous alloys is studied.When the Cu/Ni ratio is 0.21,the corresponding amorphous composition is Hf30Be18Ti16Zr16Cu3.5Ni16.5,the amorphous forming ability is the best,its critical size reaches 18mm,the supercooled liquid zone is 61.15 K,the hardness is 650 HV,and the friction coefficient is 0.4149.In the Hf30Be18Ti16Zr16Cu7.5-xNi12.5+x alloy system,as the Cu/Ni ratio decreases,the equivalent atomic size difference ? and the equivalent electronegativity difference ?x increase,and the enthalpy of mixing ?Hmix decreases,leading to difficulties in long-range rearrangement of atoms,effectively inhibiting the crystallization process,increasing the stacking density between atoms,promoting the formation of local atomic clusters,and inhibiting the diffusion and rearrangement of atoms,which is conducive to the improvement of the ability to form amorphous.(2)50mm diameter amorphous alloy shaped charge liner and 100mm diameter amorphous alloy shaped charge liner are prepared.The molds of 50 mm diameter amorphous alloy shaped charge liner and 100 mm diameter amorphous alloy shaped charge liner are designed respectively.The main material of the mold is pure copper,and the material of baffle and drainage mold is high-purity graphite.The 50 mm-diameter amorphous alloy shaped charge liner has a small amount,and the moldable casting temperature is 1110±20??1510±20?.Only by casting at 1210±20? can a completely amorphous shaped charge liner be prepared.Compared with the amount of 50 mm diameter amorphous alloyshaped charge liner,the amount of 100 mm diameter amorphous alloy shaped charge liner is doubled,and the heat storage is large.The moldable casting temperature is 1110±20??410±20 ?,Only by casting at 1410±20? can a completely amorphous shaped charge liner be prepared.(3)Compared with the ?T(59.49 K)of the Hf30Be18Ti16Zr16Cu7.5Ni12.5 amorphous alloy,the ?T(61.15 K)of the Hf30Be18Ti16Zr16Cu3.5Ni16.5 amorphous alloy is larger and the thermal stability is better.Therefore,the Hf30Be18Ti16Zr16Cu3.5Ni16.5 amorphous alloy is selected for isothermal annealing research,with the higher the temperature and the longer the holding time,the intensity of the crystallization peak becomes higher and the degree of crystallization becomes larger.And preliminarily selected an interval suitable for superplastic forming of Hf30Be18Ti16Zr16Cu3.5Ni16.5 amorphous alloy:temperature is 663 K-693 K,strain rate is 5×10-4 s-1-1×10-2s-1.(4)The superplastic deformation of Hf30Be18Ti16Zr16Cu3.5Ni16.5 amorphous alloy is mainly affected by strain rate and deformation temperature.As the temperature increases or the strain rate decreases,the uniform deformation of the amorphous alloy changes from non-Newtonian flow to Newtonian flow change.The higher the deformation temperature,the more obvious the amorphous to crystalline transition of Hf30Be18Ti16Zr16Cu3.5Ni16.5 amorphous alloy;when the deformation temperature is lower,the alloy is still amorphous;and when the deformation temperature is higher than 673 K,with as the deformation temperature increases,the degree of crystallization of the alloy continues to increase.(5)Amorphous alloy has the best superplastic deformation ability,which is characterized by Newtonian viscous rheology and no crystallization.According to the rheological behavior microstructure analysis results of Hf30Be18Ti16Zr16Cu3.5Ni16.5 amorphous alloy is obtained.The best processing parameters of amorphous alloy superplastic deformation:temperature is 663 K-693 K,strain rate is 5×10-4 s-1-1×10-3 s-1,which provides technology for further precision processing of amorphous alloy shaped charge liner stand by.