Method for preparing spherocrystal toughening amorphous-based composite

A composite material and toughening technology, which is applied in the field of amorphous matrix composite materials, can solve the problems of low plasticity and toughness of materials, small resistance to shear band expansion, etc., and achieve high strength, excellent mechanical properties, and good fracture plasticity

Inactive Publication Date: 2012-11-14
TAIYUAN UNIV OF TECH
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Problems solved by technology

At present, the morphology of the endogenous crystal phase synthesized by these two methods is dendritic. Since the dendrite structure is relatively small, it has little resistance to the expansion of the shear band during the stress process, resulting in relatively high plasticity and toughness of the material. Low

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  • Method for preparing spherocrystal toughening amorphous-based composite
  • Method for preparing spherocrystal toughening amorphous-based composite
  • Method for preparing spherocrystal toughening amorphous-based composite

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Embodiment Construction

[0015] The present invention adopts semi-solid insulation spheroidization composite liquid metal cooling directional solidification method to prepare the composition as Zr a Ti b Nb c Cu d Ni e be f The spherulite toughened amorphous matrix composite material, wherein a, b, c, d, e, f represent atomic percentage and a+b+c+d+e+f=100. and with Zr 60.0 Ti 14.7 Nb 5.3 Cu 5.6 Ni 4.4 be 10.0 Described as a preferred embodiment.

[0016] The first is semi-solid heat preservation: the alloy needs to be heated to the two-phase region, in which the melting point of the second phase crystal is higher, and the melting point of the amorphous matrix is ​​lower. The morphology of the crystal phase mainly depends on the thermodynamics and kinetics of its growth. The free energy formula for crystal growth can be composed of two terms, surface area and volume, expressed as follows:

[0017] AG = ΔG i +ΔG v =σ·A+Δg·v (1)

[0018] Among them, σ is the interface energy between the c...

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Abstract

The invention relates to a method for preparing a ZraTibNbcCudNieBef (atomic ratio) spherocrystal toughening amorphous-based composite through adopting a semisolid thermal insulation composite liquid metal directional solidification method. The method comprises: selecting raw materials and proportioning according to the atomic elements of ZraTibNbcCudNieBef; using a high vacuum non-self-consuming arc melting furnace, and melting the raw materials into a master alloy button ingot under the protection of high-purity Ar; mechanically breaking an ingot to be contained in an alundum tube, vacuumizing to the protection of high-purity Ar, using an induction coil of a directional solidification furnace to heat the alundum tube to 1200 DEG C, and 1 minutes later, cooling to 900-920 DEG C; thermally insulating for 10 minutes at 900-920 DEG C; and directionally solidifying, controlling the axial temperature gradient of about 45K/min, selecting a drawing rate of 0.2-1.0 mm/s, and adopting Ga-In liquid alloy as a cooling medium. When uniaxial compression is carried out at room temperature, the strength and fracture ductility of the spherocrystal toughening amorphous-based composite Zr60.0Ti14.7Nb5.3Cu5.6Ni4.4Be10.0 respectively reach 1500MPa and 12.0%, and the fracture ductility strain is greatly improved.

Description

technical field [0001] The invention relates to the technical field of metal material preparation, in particular to the preparation of spherulite-toughened amorphous-based composite materials through a new method—a semi-solid thermal insulation composite liquid metal directional solidification method. technical background [0002] Bulk amorphous alloys have attracted the attention of many material scientists due to their high elastic limit, high tensile and compressive strength, and strong corrosion resistance. However, the vast majority of bulk amorphous alloys exhibit brittle fracture when loaded at room temperature due to the formation of highly localized shear bands during deformation, which shear when further deformed. The band softens, and finally fractures on the softened shear plane, which limits the engineering application of bulk amorphous [1]. Therefore, some researchers adjusted the composition and controlled the cooling rate so that the alloy melt first precipi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/10
Inventor 乔珺威张勇杨慧君周禾丰
Owner TAIYUAN UNIV OF TECH
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