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Nickel-free, beryllium-free, copper-free zirconium-based bulk amorphous alloy with high amorphous-forming ability and its preparation

An amorphous alloy, zirconium-based technology, applied in the field of bulk amorphous alloys, can solve the problems of limited practical application, catastrophic fracture of materials, and inability to prepare large-sized amorphous alloys.

Active Publication Date: 2020-12-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these systems, the excellent amorphous formation ability is closely related to the addition of Be and Ni elements. However, Be, Cu, and Ni are highly cytotoxic and bioincompatible elements, especially when Be and Ni are removed from these alloy compositions. Ni elements tend to greatly reduce the amorphous forming ability of the system, making it impossible to prepare large-sized amorphous alloys.
On the other hand, the room temperature brittleness of these Be-containing Zr-based amorphous alloys will lead to sudden catastrophic fracture of the material, which limits its practical application.

Method used

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  • Nickel-free, beryllium-free, copper-free zirconium-based bulk amorphous alloy with high amorphous-forming ability and its preparation
  • Nickel-free, beryllium-free, copper-free zirconium-based bulk amorphous alloy with high amorphous-forming ability and its preparation
  • Nickel-free, beryllium-free, copper-free zirconium-based bulk amorphous alloy with high amorphous-forming ability and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The atomic percentage of each component in the zirconium-based bulk amorphous alloy is: Zr 55%, Co 20%, Al 15%, Ag8%, Hf 2% formed Zr 55 co 20 Al 15 Ag 8 f 2 It has strong amorphous forming ability, and can obtain bulk amorphous alloy with critical size not less than 10mm under the condition of electric arc melting copper mold suction casting.

[0040] Such as figure 1 As shown in Zr 55 co 20 Al 15 Ag 8 f 2 The XRD pattern of the 10mm sample has only typical diffuse scattering peaks of amorphous, indicating that the 10mm alloy is an amorphous phase, and the alloy has a strong ability to form amorphous.

[0041] figure 2 Zr shown 55 co 20 Al 15 Ag 8 f 2 The DSC curve of the sample, the heating rate is 20K / min, it can be seen from the figure that the glass transition temperature (T g ), initial crystallization temperature (T x ) and the width of the supercooled liquid phase region (T x -T g ) are 716K, 759K and 43K respectively.

[0042] The room temp...

Embodiment 2

[0044] The atomic percentage of each component in the zirconium-based bulk amorphous alloy is: Zr 55%, Co 21%, Al 15%, Ag6%, Nb 3% formed Zr 55 co 21 Al 15 Ag 6 Nb 3 It has strong amorphous forming ability, and can obtain bulk amorphous alloy with critical size not less than 10mm under the condition of electric arc melting copper mold suction casting.

[0045] Such as figure 1 As shown in Zr 55 co 21 Al 15 Ag 6 Nb 3 The XRD pattern of the 10mm sample has only typical diffuse scattering peaks of amorphous, indicating that the 10mm alloy is an amorphous phase, and the alloy has a strong ability to form amorphous.

[0046] The room temperature compressive stress-strain curve of the amorphous alloy is given by Figure 4 As shown, the strain rate is 1.0*10 -4 the s -1 . It can be seen that the alloy does not undergo catastrophic fracture immediately after reaching the yield strength, but undergoes a period of plastic deformation (>3%), indicating that the amorphous all...

Embodiment 3

[0048] The atomic percentage of each component in the zirconium-based bulk amorphous alloy is: Zr 55%, Co 20%, Al 15%, Ag8%, Nb 2% formed Zr 55 co 20 Al 15 Ag 8 Nb 2 It has strong amorphous forming ability, and can obtain bulk amorphous alloy with critical size not less than 10mm under the condition of electric arc melting copper mold suction casting.

[0049] Such as figure 1 As shown in Zr 55 co 20 Al 15 Ag 8 Nb 2 The XRD pattern of the 10mm sample has only typical diffuse scattering peaks of amorphous, indicating that the 10mm alloy is an amorphous phase, and the alloy has a strong ability to form amorphous.

[0050] The room temperature compressive stress-strain curve of the amorphous alloy is given by Figure 5 As shown, 1.0*10 -4 the s -1 . It can be seen that the alloy does not undergo catastrophic fracture immediately after reaching the yield strength, but undergoes a period of plastic deformation (>4.5%), indicating that the amorphous alloy has good plast...

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Abstract

The present invention is a nickel-free, beryllium-free, copper-free, zirconium-based bulk amorphous alloy with high amorphous-forming ability and its preparation, which belongs to the bulk amorphous alloy and aims to not only remove nickel, beryllium and copper elements that have toxic side effects on the human body, but also have Strong amorphous forming ability, the centimeter-level bulk amorphous alloy can be prepared by arc melting copper mold suction casting method. The atomic percentage expression of the amorphous alloy composition is Zr a co b Al c Ag d m e , where 53≤a≤55, 20≤b≤23, 10≤c≤15, 3≤d≤9, M is Nb or Hf, 2≤e≤8, and 30≤b+c≤36, a +b+c+d+e=100. The zirconium-based bulk amorphous alloy of the present invention has a plastic deformation capacity of >2.5% and high strength, is easy to produce and does not contain Ni, Be, Cu harmful elements to biology, and can be used in biological materials, sporting goods and medical devices, etc. The field has very broad application prospects.

Description

technical field [0001] The invention belongs to bulk amorphous alloys, in particular to a zirconium-based bulk amorphous alloy with high amorphous-forming ability not containing metal elements Ni, Be and Cu, the critical size of which is not less than 10 mm, and the plastic deformation capacity is not less than 2% nickel-free, beryllium-free, copper-free zirconium-based bulk amorphous alloy with high amorphous-forming ability and its preparation. Background technique [0002] Bulk amorphous alloys are a new class of metastable materials developed in the late 1980s. It is a multi-component system composed of a variety of elements with a large difference in atomic radius and a large negative heat of mixing. The critical cooling rate for glass transition of this type of alloy can be reduced to below 100K / s, so large pieces of amorphous can be prepared by conventional copper mold casting. Different from the long-range ordered arrangement of atoms in traditional metal materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/10
CPCC22C45/10C22C1/11
Inventor 吕昭平刘广来吴渊王辉刘雄军
Owner UNIV OF SCI & TECH BEIJING