Preparation And Properties Of Tungsten Fibers/Particles Reinforced Zr-based Amorphous Composite Materials

Zr_41.25Ti_13.75Ni₁₀Cu_12.5Be_22.5(Vit 1)amorphous alloy has become one of the favored materials for researchers due to its excellent glass forming ability and mechanical properties.As a kind of amorphous alloy,Vit 1 amorphous alloy has not only the advantages of high strength and high toughness,but also the disadvantage of low plasticity.Through the researches in recent years,it has been found that by the addition of particles or fibers to amorphous alloys,or by the self-reinforcing solidification in amorphous alloys,the amorphous composites can be fabricated,which is an effective way to solve the low plasticity of amorphous alloys.In order to adjust and improve the comprehensive mechanical properties of bulk amorphous materials,in this paper,the tungsten fibers and tungsten particles were introduced into the base amorphous alloy as the second reinforcement phase,respectively,which can inhibit the formation and expansion of shear bands during the deformation process of the composite material,thus improving the plasticity and strength of the base amorphous alloy.The influence of the preparation process parameters on the interface of the fiber reinforced amorphous alloy composites was systematically studied.At the same time,the improvement effect of the matrix alloying on the interfacial reaction was discussed,and the relationship between the degree of interfacial reaction and the interfacial strength and the mechanical properties of the composite material was analyzed.The following aspects are mainly included in the paper:1)The vacuum infiltration casting device was designed and developed by ourselves.The tungsten fiber reinforced Zr-based amorphous composite materials were successfully prepared by using the U-shaped quartz tube,straight quartz tube,and Q235 steel tube with the infiltration casting water quenching method,respectively.The size of the composite materials is?13×70mm.The interfacial reaction and mechanical properties of the Zr-based amorphous composites reinforced with the tungsten fibers were also studied.The results show that the amorphous composite material prepared by the U-shaped tube has the best mechanical properties.In addition,the amorphous composite material prepared by the Q235steel tube shows a shear fracture.2)The effect of different infiltrating time on the interfacial reaction of the amorphous composites was studied.The results show that when the infiltrating time is 1min,the interfacial reaction of the composite material has occurred,and tiny nanocrystalline phases are generated at the boundary of the tungsten particles.With the increase of the infiltrating time,the degree of the interfacial reaction increases,and the size of the crystalline phase generatedincreases.When the infiltrating time is 10 min,the compressive strength reaches a maximum of 2030 MPa,the compressive plasticity is 44%,and a small amount of large polygonal crystals appear in the amorphous matrix of the composite material.According to the scanning analysis results of the compressed sample of the composite material,it is indicated that with the increase of the infiltrating time,the number of shear bands during the deformation of the sample increases,and the gap width between the shear bands decreases,thereby improving the compression performance of the composite material.3)The tungsten particles reinforced Zr-based amorphous composites with different diameters were prepared,and their interfacial reactions and mechanical properties were investigated.The results show that the interfacial reaction of the sample with the larger diameter is more intense.When the sample diameter is 6mm,the composite material has better compression ductility and strength.