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Cobalt iron base block body metal glass with super-large super-cooling interval and preparation method thereof

A bulk metal, cobalt-iron-based technology, applied in the field of amorphous alloys, can solve the problems of restricted application, limited application, high raw material cost, etc., and achieve excellent mechanical properties, good superplastic forming processability, and excellent comprehensive performance Effect

Inactive Publication Date: 2012-03-14
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] So far, the developed Fe-based and Co-based bulk metallic glasses exhibit high fracture strength and hardness, but the small width and critical dimension of the supercooled liquid phase region restrict their application in the field of superplastic forming
Some noble metal-based bulk metallic glasses, such as Pd, Pt, or Au-based metallic glass alloys, although they exhibit strong amorphous-forming ability and have a wide supercooled liquid region, there is a good supercooled liquid region. Plasticity and precision forming ability, but high raw material cost limits its application in engineering field

Method used

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  • Cobalt iron base block body metal glass with super-large super-cooling interval and preparation method thereof
  • Cobalt iron base block body metal glass with super-large super-cooling interval and preparation method thereof
  • Cobalt iron base block body metal glass with super-large super-cooling interval and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, the molecular formula of the cobalt-iron-based bulk metallic glass is (Co 0.5 f 0.5 ) 62 Nb 6 Dy 2 B 30 , its preparation method is as follows:

[0042] Co, Fe, Nb, Dy and B components with a raw material purity of not less than 99.5wt% are prepared in a molar ratio of 31:31:6:2:30, mixed and smelted in an electric arc furnace with an argon atmosphere 3 to 4 times, after cooling to get (Co 0.5 Fe 0.5 ) 62 Nb 6 Dy 2 B 30 Master alloy ingot; then using vacuum copper mold casting method, this ingot is re-melted to obtain master alloy melt, and then the master alloy melt is pressed into the copper mold to obtain the composition (Co 0.5 Fe 0.5 ) 62 Nb 6 Dy 2 B 30 , bulk metallic glass amorphous rod samples with diameters of 2mm and 3mm, and amorphous sheet samples with a size of 17mm×10mm×1mm.

[0043] The above bulk metallic glass amorphous samples were tested as follows:

[0044] X-ray diffraction (XRD) was used to analyze the structur...

Embodiment 2

[0056] In this embodiment, the molecular formula of the cobalt-iron-based bulk metallic glass is (Co 0.5 Fe 0.5 ) 61 Nb 6 Dy 3 B 30 , its preparation method is substantially the same as in Example 1, specifically as follows:

[0057] Co, Fe, Nb, Dy and B components with a raw material purity of not less than 99.5wt% are prepared in a molar ratio of 30.5:30.5:6:3:30, mixed and smelted in an electric arc furnace with an argon atmosphere 3 to 4 times, after cooling to get (Co 0.5 Fe 0.5 ) 62 Nb 6 Dy 2 B 30 Master alloy ingot; then using vacuum copper mold casting method, this ingot is re-melted to obtain master alloy melt, and then the master alloy melt is pressed into the copper mold to obtain the composition (Co 0.5 Fe 0.5 ) 61 Nb 6 Dy 3 B 30 , bulk metallic glass amorphous rod samples with diameters of 3mm and 4mm, and amorphous sheet samples with a size of 17mm×10mm×1mm.

[0058] The same method and equipment as in Example 1 were used to test the bulk metalli...

Embodiment 3～23

[0064] Similar to Example 1, the molecular formulas of the alloy components of the cobalt-iron-based bulk metallic glasses in Examples 3 to 23 are the molecular formulas shown in the following table, respectively. Its preparation method is basically the same as Example 1. The same method and equipment as in Example 1 were used to test the above bulk metallic glass amorphous samples respectively. The critical dimensions, thermodynamic parameters, mechanical properties and soft magnetic properties of the tested samples are shown in Table 1.

[0065] The symbols in Table 1 have the following meanings:

[0066] D——sample diameter under the experimental conditions; T g ——Glass transition temperature; ΔT——Width of supercooled liquid phase region; T 1 ——liquidus temperature; σ——compression fracture strength; H V - Vickers hardness; H c ——coercive force; μ e ——Effective magnetic permeability (1A / m, 1kHz); M s - Saturation magnetization.

[0067] Table 1: Alloy composition, cri...

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Abstract

The invention discloses cobalt iron base block body metal glass with a super-large super-cooling interval, which has a molecular formula of CoaFebNbcMdBe, wherein M is any one kind of elements from Dy, Y, Tb, Er and Gd, a, b, c, d and e are atom mol contents, a is greater than or equal to 24 but smaller than or equal to 56, b is greater than or equal to 6 but smaller than or equal to 38, c is greater than or equal to 4 but smaller than or equal to 8, d is greater than 0 but smaller than or equal to 5, e is greater than or equal to 6 but smaller than or equal to 31, and in addition, the sum of a, b, c, d and e is 100. The cobalt iron base block body metal glass has high glass forming capability and super-large super-cooling liquid phase interval width, the value can exceed 100K or even reach 130K, simultaneously, the ultra-high intensity and the excellent soft magnetic performance are realized, and in addition, the price of raw materials is relatively low, so the cobalt iron base block body metal glass belongs to the block body metal glass with the excellent integral performance, and wide application prospects are realized in the fields of miniature precise devices, magnetic function materials and the like.

Description

technical field [0001] The invention belongs to the field of amorphous alloys, and in particular relates to a cobalt-iron-based bulk metallic glass with a super-large supercooling interval and a preparation method thereof. Background technique [0002] In modern society, traditional metal materials and glass materials are one of the most widely used materials in human production and life. Metallic materials are characterized by excellent mechanical properties, electrical and thermal conductivity, and some metallic materials also exhibit excellent magnetic properties. However, the manufacturing process of metal parts is relatively complicated, especially the processing and manufacturing of high-strength and miniature precision metal devices is more difficult. [0003] Glass materials above the softening temperature are easily deformed after being pressurized, and the shape remains unchanged after cooling down or pressure disappearing. Combined with various forming methods s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/00C22C45/04C22C1/02
Inventor 沈宝龙满其奎董亚强
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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