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Mosten Alloy Co., Ltd.

Tungsten pellets reinforced Bulk Amorphous Composites

  • Mosten
  • 26 Nov

Under uniaxial tension and compression, the single-phase amorphous alloy has high strength (about 2 GPa) and elastic strain (about 2%). However, the failure of amorphous alloy along a single shear band shows the characteristics of brittle material, that is, there is almost no plastic deformation. The plastic deformation of amorphous materials can be greatly improved by adding ductile phase V into amorphous matrix or precipitating ductile phase 2 through alloy composition design, which provides more opportunities for the application of bulk amorphous materials in engineering. Tungsten pellets or wires reinforced bulk amorphous composites have a certain application prospect in armor piercing materials. Zr41.25Ti13.75Ni10Cu12.5Be22.5 alloy has large amorphous forming ability 4 (diameter up to 50 mm) and low melting point (937k), therefore, it is convenient to prepare tungsten wire reinforced amorphous composite 6 with large volume fraction by infiltration casting method. Due to the limitation of master alloy preparation and casting difficulty, there are few studies on the preparation of Amorphous Composites Reinforced with large amount of tungsten pellets (high volume fraction). At present, only the United States has reported on this aspect. The alloys used are Zr57Nb5Al10Cu15.4Ni12.6. The volume fraction of reinforced phase is 50%. And the particle size is larger. The preparation of large size and high content of small particle ductile amorphous matrix composites has not been reported. On the one hand, high volume fraction particle reinforced composites can be prepared by reducing the particle size of reinforcement phase, which can improve the density of armor piercing materials. On the other hand, due to the increase of melt viscosity, the casting process is difficult. At the same time, the possibility of crystallization is increased due to the increase of liquid-solid interface area, which brings some difficulties to the formation of amorphous.

Zr41.25Ti13.75Ni10Cu12.5Be22.5 the average size of tungsten pellets is less than 10 The amorphous matrix composites with the volume fraction of UM up to 60% can avoid the pouring process, solve the problem that the traditional infiltration casting process can not penetrate into the small particles, at the same time, it also reduces the action time of liquid and solid phase, and avoids the occurrence of crystallization phenomenon of alloy melt in the preparation process.

Test method
Zr41.25Ti13.75Ni10Cu12.5Be22.5 (atomic percentage) has a large amorphous forming ability D]. Amorphous rods with a diameter of 14 mm can be prepared at least under the condition of water quenching in quartz tube. Therefore, the alloy was used as the matrix material of the composite. Put the weighed metal into a BN crucible sealed in a quartz tube. The vacuum degree of the quartz tube is not greater than 1x10-3 Pa, and the high-purity argon is used to replace it for three times. Melting in medium frequency electric furnace. The purity of the metal used is more than 99.95% (mass fraction, the same below). After melting, the alloy is cooled naturally. The structure of the master alloy obtained by this method is uniform, easy to be broken into powder and easy to mix with other powder particles in solid state. The tungsten powder is commercial chemical pure material, the tungsten content is 99%. Under the condition of vacuum and argon protection, tungsten powder with a certain volume fraction and Zr41.25Ti13.75Ni10Cu12.5Be22.5 alloy powder were mixed in a ball mill (self-made) for 5 minutes. The mixed powder was lumped on the hydraulic press. The briquette was put into 1Cr18Ni9Ti steel pipe with a diameter of 10 mm and a diameter of 8 mm and a length of 100 mm were installed on the top of the pressure block in the steel pipe The tungsten rod with a diameter of MM is vacuumed to 1 × 10-3Pa, and is quickly introduced into a resistance furnace with a temperature of 1370 K for 5 min. by shaking the steel pipe up and down, the tungsten rod impacts the melted material, increases the flow of molten material and reduces the porosity, and then quenchs in saturated brine. In order to carry out comparative test, single-phase amorphous alloy was prepared by using bulk master alloy under the same other conditions. For composite materials, only two kinds of composites with the lowest (10%) and the highest (60%) w particle volume fraction are given in this paper.

After water quenching, the stainless steel layer was removed. The phase composition of the sample was analyzed by RIGAKU D / max-Ra X-ray diffractometer (12 kW, Cu Ka radiation, wavelength a = 1.5405 nm). The mechanical properties of the sample were measured by static compression test (wdw4200 microcomputer controlled electronic universal testing machine). The indenter rate was 1 × 10-4 s-1, and the preload was 0.1 kN. The fracture morphology was observed by S-3000N scanning electron microscope.