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Amorphous nickel-free zirconium alloy

a nickel-free zirconium alloy and nickel-free technology, applied in the field of amorphous alloys (or metallic glass), to achieve the effects of high fracture toughness, high strength and easy formation

Inactive Publication Date: 2013-02-07
INST OF METAL RES CHINESE ACADEMY OF SCIENECE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an amorphous zirconium alloy that is easy to form without any nickel and can be made through a copper mold casting process to create materials or parts with high strength, fracture toughness, and resistance to corrosion under human biological environments. The alloy has a unique composition of zirconium and titanium, with a certain percentage of titanium, which increases its glass-forming ability. The alloy does not contain any impurities such as hydrogen, oxygen, nitrogen, carbon, or phosphorus, which can significantly degrade its glass-forming ability. To maintain its strength and performance, the alloy should be processed to remove any impurities, particularly oxygen, which should not be more than 0.1%.

Problems solved by technology

This limiting factor is due to the requirement of sufficiently high rate of heat absorption from the alloy melt in order to suppress the crystallization process.

Method used

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  • Amorphous nickel-free zirconium alloy
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Examples

Experimental program
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Effect test

exemplary embodiment 1

b>2.1Cu25Al12 Alloy (Numeric References Refer to Atomic Percentage)

[0043]The starting materials are pure Zr, Ti, Cu, Al in the forms of rod, bulk, ingot, sheet brought in the market (the purity is higher than 99.5% in percentage weight), which are processed under Ti-gettered argon atmosphere in a water-cooled copper hearth by arc melting to form a quaternary master alloy ingot. The master alloy ingot is melted for several times in order to ensure compositional homogeneity. Place 55 g master alloy ingot in a water-cooled copper crucible. Arc melting the ingot to a temperature which is higher than the melting point for forming an alloy melt. After melting, turning the copper crucible to pour the alloy melt to a copper mold for casting. The copper mold has an inner cavity with a preset size of φ10 mm×110 mm (other dimension with different diameter and length or various geometry can also be selected). After cooling, the alloy melt forms an alloy rod with a diameter of 10 mm and a length...

exemplary embodiment 2

b>4.4Cu24Al10 Alloy

[0044]The starting materials are pure Zr, Ti, Cu, Al in the forms of rod, bulk, ingot, sheet brought in the market (the purity is higher than 99.5% in percentage weight), which are processed under Ti-gettered argon atmosphere in a water-cooled copper hearth by arc melting to form a quaternary master alloy ingot. The master alloy ingot is melted for several times in order to ensure compositional homogeneity. Place 40 g master alloy ingot in a water-cooled copper crucible. Arc melting the ingot to a temperature which is higher than the melting point for forming an alloy melt. After melting, turning the copper crucible to pour the alloy melt to a copper mold for casting. The copper mold has an inner cavity with a preset size of φ8 mm×110 mm (other dimension with different diameter and length or various geometry can also be selected). After cooling, the alloy melt forms an alloy rod with a diameter of 8 mm and a length of 70 mm. The cross-section of the alloy rod is p...

exemplary embodiment 3

ub>2.02Hf2.52Cu25Al12 Alloy

[0045]The starting materials are pure Zr, Ti, Cu, Al, Hf in the forms of rod, bulk, ingot, sheet brought in the market (the purity is higher than 99.5% in percentage weight), which are processed under Ti-gettered argon atmosphere in a water-cooled copper hearth by arc melting to form a quinary master alloy ingot. The master alloy ingot is melted for several times in order to ensure compositional homogeneity. Place 55 g master alloy ingot in a water-cooled copper crucible. Arc melting the ingot to a temperature which is higher than the melting point for forming an alloy melt. After melting, turning the copper crucible to pour the alloy melt to a copper mold for casting. The copper mold has an inner cavity with a preset size of φ10 mm×110 mm (other dimension with different diameter and length or various geometry can also be selected). After cooling, the alloy melt forms an alloy rod with a diameter of 10 mm and a length of 70 mm. The cross-section of the all...

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Abstract

An amorphous Nickel-Free Zirconium alloy which is readily formed through copper mold casting, comprising a composition consisting of four elements in which the first element is Zr, the second element is Ti, the third element is Cu and the fourth element is Al, wherein an atomic percent of the first to the fourth elements in the composition are represented by a, b, c and d respectively, wherein a=45˜69%, b=0.25˜8%, c=21˜35%, and d=7.5˜15%, where a sum of a, b, c and d is smaller than or equal to 100%. The composition of the amorphous alloy within the above range is melted in a copper mold to form bulk amorphous materials or parts which have characteristics of high tensile strength, high fracture toughness, low Young's modulus and high corrosion resistance.

Description

BACKGROUND OF THE PRESENT INVENTION[0001]1. Field of Invention[0002]The present invention relates to an amorphous alloy (or metallic glass), and more particularly to an amorphous nickel-free zirconium alloy which is readily formed through copper mold casting.[0003]2. Description of Related Arts[0004]Compared to general polycrystalline structured materials, amorphous alloy (also known as metallic glass) has the major structural features of absence of long-range order and grain-boundary. Accordingly, amorphous alloy is advantageous in providing high strength level, high resistance to corrosion and isotropic feature and has great potentials in a variety of applications in the field of micromechanics, microelectronics, sports apparatus or equipment, sophisticated equipment, security device and medical materials, etc. In comparison, general metals and alloys undergo crystallization when normally cooled from liquid state to form polycrystalline structured materials, while amorphous alloys...

Claims

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Application Information

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IPC IPC(8): C22C45/10
CPCC22C1/002C22C45/10C22C1/03C22C1/02C22C1/11
Inventor HE, QIANGXU, JIAN
Owner INST OF METAL RES CHINESE ACADEMY OF SCIENECE
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