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Large-size Zr standard crystal material and preparation method thereof

A large-scale, benchmark technology, applied in the field of quasicrystal materials and their preparation, can solve the problems of complex process, unfavorable understanding of the formation mechanism of Zr benchmark crystal materials, and unfavorable application of Zr benchmark crystal materials, etc., and achieves a simple preparation process. Effect

Active Publication Date: 2015-02-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Zr reference crystal materials are mainly obtained by amorphous crystallization method, which is complicated and difficult to control
This is not conducive to the understanding of the formation mechanism of Zr reference crystal materials, and is not conducive to the application of Zr reference crystal materials as structural materials.

Method used

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  • Large-size Zr standard crystal material and preparation method thereof
  • Large-size Zr standard crystal material and preparation method thereof
  • Large-size Zr standard crystal material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The selected alloy composition is Zr 64 Ti 6 Cu 13.5 Ni 8.5 Al 8 (atomic percent).

[0035] The smelting method of the master alloy of the present invention adopts the electric arc melting technology. The raw materials are Zr, Ti, Ni, Cu, and Al high-purity metals (purity not less than 99.9wt.%), and the master alloy ingot is melted by electric arc. First evacuate the working chamber to 10 -3 ~10 -4 Pa, then pass into high-purity argon gas (purity is 99.99wt.%) for smelting; before smelting alloy, Ti metal ingot is melted at first, forms titanium oxide by oxidation reaction to further reduce the partial pressure of oxygen in the working chamber; To ensure that the composition of the alloy ingot is as uniform as possible, each alloy ingot needs to be smelted 4 times. Take 20g of alloy ingot and put it into the crucible of tilting casting equipment, vacuumize the working chamber to 10 -3 ~10 -4Pa, and then arc melting, after the alloy is completely melted, tilt ...

Embodiment 2

[0037] The difference from Example 1 is that the alloy composition is Zr 62 Ti 8 Cu 13.5 Ni 8.5 Al 8 (atomic percent); figure 1 B is the photo of the quasicrystal sample with a diameter of 8mm in this embodiment, Figure 5 The X-ray diffraction results of the as-cast samples with diameters of 6 mm and 8 mm in this example show that the samples are mainly composed of quasi-crystalline phases.

Embodiment 3

[0039] The difference from Example 1 is that the alloy composition is Zr 60 Ti 10 Cu 13.5 Ni 8.5 Al 8 (atomic percent); diameter is 2mm sample adopts copper mold spray-casting method to prepare, gets 5g alloy ingot and puts into quartz crucible, the working cavity is evacuated to 10 -3 ~10 -4 Pa, then carry out induction melting, after the alloy is completely melted (alloy melt temperature is higher than 1250 ° C), use argon to spray the alloy melt into the copper mold, and obtain a cast sample with a diameter of 2 mm (cooling rate is about 10 2 K / s).

[0040] image 3 Middle curve A and Figure 4 Photo A in the middle is the corresponding X-ray diffraction result and transmission electron microscope analysis result, which shows that the sample is mainly composed of quasicrystals. It can be found that the volume fraction of quasicrystals is higher than 90% by analyzing transmission electron microscope photos.

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Abstract

The invention provides a large-size Zr standard crystal material and a preparation method thereof and belongs to the technical field of standard crystal materials and preparation thereof. The large-size Zr standard crystal material is mainly composed of by volume percentage, 90-100% of Zr standard crystals and includes, by atomic percentage, ZrMNi<c>Cu<d>Al<e>, wherein the M indicates one or two of Ti and Ta, the a=52-68, the b=2-18, the c=6.5-10, the d=12-15, the e=8-10, and the a+the b+ the c+the d+the e=100. By preparing a master alloy ingot via electric arc smelting and processing the master alloy ingot by the copper die casting technology, a large-size as-cast-condition standard crystal material can be obtained, and the size can range from millimeters to tens of millimeters. The large-size Zr standard crystal material is characterized by high strength and rigidity and has important value for development and application of standard crystals.

Description

technical field [0001] The invention belongs to the technical field of quasicrystal materials and preparation thereof, in particular to a large-size Zr reference crystal material with high strength, high elastic strain and adjustable quasicrystal particle size and a preparation method thereof. Background technique [0002] Since Shechtman et al. discovered quasicrystals in Al-Mn alloys in the 1980s, quasicrystals have attracted widespread attention for their unique structures. A large number of studies have shown that quasicrystalline materials have unique physical and chemical properties, such as high hardness, low coefficient of friction, non-stick, corrosion resistance and wear resistance, etc. [0003] In the past few decades, people have carried out a lot of research work on Zr reference crystal materials. Studies have found that Zr reference crystal materials have high hardness, high elasticity, high temperature deformation ability and high hydrogen storage performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C16/00C22C45/10C22C1/02
Inventor 朱正旺张海峰王爱民付华萌李宏胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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