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A double-spherulite/zirconium-based amorphous composite material and its preparation method
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A composite material, zirconium-based amorphous technology, applied in the field of metal matrix composite materials, can solve the problem of sacrificing material strength, etc., and achieve the effect of excellent performance, novel double composite structure, and simple and controllable preparation method
Active Publication Date: 2020-01-24
NANJING UNIV OF SCI & TECH
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Although the solid solution phase can enhance the plasticity of amorphous composites to a certain extent, it will seriously sacrifice the strength of the material
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Embodiment 1
[0042] (1) Selection of raw materials
[0043] The purity of each metal component that the present invention prepares master alloy ingot for selection is as table 1, and alloy composition is
[0044] (Zr 56.2 Ti 13.8 Nb 5.0 Cu 6.9 Ni 5.6 be 12.5 ) 99 C 1 (abbreviation: S1+C 1) (atomic percent).
[0045] Table 1 Purity (%) of metal components selected for preparation of master alloy ingots
[0046] alloy element Zr Ti Cu Ni Be Nb C purity / % 99.95 99.95 99.99 99.99 99.5 99.9 99.99
[0047] (2) Preparation of master alloy ingots
[0048] Under the condition of Ti inhalation and high-purity argon protection, the master alloy ingot is melted in a non-consumable arc melting furnace. The specific procedure is as follows:
[0049] a. After mechanically grinding the surface of the metal raw material to remove the oxide scale on the surface, prepare the material according to the designed composition ratio; according to the weight of abo...
Embodiment 2
[0061] Using the same method as Example 1, the alloy composition is: (Zr 56.2 Ti 13.8 Nb 5.0 Cu 6.9 Ni 5.6 Be 12.5 ) 99.5 C 0.5 , a bulk metallic glass composite sample of β-Zr(Ti) phase and ZrC phase double spherulite composite with a diameter of 6 mm was prepared. Figure 4 As shown, two nearly spherical phases are distributed on the amorphous matrix, with an average size of about 20 μm and 4 μm, respectively, which were analyzed by XRD ( image 3 ), it is found that the two phases of this size are β-Zr(Ti) phase and ZrC phase, respectively, and both phases are in-situ precipitation in the matrix, which is well combined with the interface of the amorphous matrix.
Embodiment 3
[0063] Using a method similar to Example 1, the alloy composition is: (Zr 60 Ti 14.67 Nb 5.33 Cu 5.56 Ni 4.44 Be 10 ) 99 C 1 , a bulk metallic glass composite sample with β-Zr(Ti) phase and ZrC phase double spherulite composite with a diameter of 6 mm was prepared under the condition of semi-solid heat preservation for 50 min. Figure 5 As shown, two nearly spherical phases are distributed on the amorphous matrix, with an average size of about 35 μm and 8 μm, respectively, which were analyzed by XRD ( image 3 ), it is found that the two phases of this size are β-Zr(Ti) phase and ZrC phase, respectively, and both phases are in-situ precipitation in the matrix, which is well combined with the interface of the amorphous matrix.
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Abstract
The invention discloses a double spherulite phase / amorphous composite material and a preparation method thereof. The chemical expression of the zirconium-based amorphous composite material of the present invention is (Zr a Ti b Cu c Ni d Nb e be f ) C g (atomic percent), where 35≤a≤70, 5≤b≤15, 5≤c≤20, 2≤d≤12, 5≤e≤15, 5≤f≤23, 0.5≤g≤2, a+ b+c+d+e+f+g=100. According to the principle of material compounding, the large-scale plastic phase β-Zr(Ti) phase is compounded on the amorphous matrix to improve the plasticity of the material, and the fine and uniform ceramic phase ZrC phase is compounded to enhance the yield strength of the material. The specific preparation method is as follows: melt the master alloy ingot and cast it into a master alloy profile; put the master alloy profile into a crucible and heat it until it is completely melted, after a certain period of overheating treatment, cool down to the solid-liquid two-phase region, perform semi-solid treatment, and control the phase The morphology and size of the zirconium-based amorphous composite material composed of β‑Zr (Ti) phase and ZrC phase double spherulite phase were obtained by rapid sequential solidification method.
Description
technical field [0001] The invention belongs to the technical field of metal-matrix composite materials, in particular a zirconium-based amorphous composite material with double spherical phases and a preparation method thereof. Background technique [0002] Compared with traditional materials, bulk metallic glass (BMG) has the advantages of high strength and high hardness, but its special atomic structure also leads to its serious defect of room temperature brittleness, which hinders the application of BMG in engineering. Therefore, finding ways to improve the plasticity of BMG has always been a hot issue in the research of amorphous alloys. [0003] Researchers have also made a lot of efforts to solve this problem. In 2000, the Johnson research group in the United States prepared micron-sized β-Zr(Ti) for the first time by adding Nb alloying elements to the Zr-Ti-Cu-Ni-Be alloy system. Solid solution phase plasticized BMG composites, and then Chen Guang et al. performed s...
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