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Mold for preparing tricrystal and preparation method of tricrystal

A mold and seed crystal technology, which is applied in the field of preparing three-crystal molds and three-crystal preparation, can solve the problems of unable to systematically study the three-pronged grain boundary, and the Bridgman crystal growth furnace cannot prepare three-crystal crystals, etc., to achieve simple molds Effect

Inactive Publication Date: 2020-12-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem in the prior art that the ternary crystal of the required orientation cannot be prepared by using the Bridgman crystal growth furnace, so that the ternary grain boundary cannot be systematically studied

Method used

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  • Mold for preparing tricrystal and preparation method of tricrystal
  • Mold for preparing tricrystal and preparation method of tricrystal
  • Mold for preparing tricrystal and preparation method of tricrystal

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Such as Figure 1-6 As shown, in a preferred embodiment, the mold and preparation method used for preparing pure Cu triple crystals from pure Cu single crystals are as follows:

[0062] The mold for preparing three crystals of the present invention is used in the core area of ​​the mold in the Bridgman crystal growth furnace, including the furnace wall 4 and the core main body area 5; wherein, the furnace wall 4 is a hollow cylinder, and the furnace wall 4 has two ends. The thread is located outside the core body area 5, and the outer diameter of the furnace wall 4 is 35 mm.

[0063] The core body region 5 includes an outer graphite layer 8 , an inner graphite layer 9 and a seed placement layer 10 .

[0064] The inner graphite layer 9 is the remaining part of an equilateral triangular prism after cutting off six triangular prisms at the center positions of three corners and three side lengths, and is located in the center of the core body area 5. The cross-sectional he...

Embodiment 2

[0076] Such as Figure 1-6 As shown, in a preferred embodiment, the mold and preparation method used to prepare pure Au triple crystals from pure Au single crystals are as follows:

[0077] The mold for preparing the three crystals of the present invention is basically the same as that of Example 1, except that the section height of the inner graphite layer 9 is 6.5 mm.

[0078] In this embodiment, using the above-mentioned mold to prepare pure Au three crystals includes the following steps:

[0079] Step 1: Take out the pure Au single crystal, and use the X-ray Laue method to determine the orientation of the single crystal.

[0080] Step 2: The pure Au single crystal is cut into trapezoidal columns by wire cutting to obtain the pure Au seed crystal. The height of the trapezoidal cross section of the pure Au seed crystal is 0.8 mm.

[0081] Step 3: immerse the pure Au seed crystal in nitric acid solution for 30 minutes, and then wash it with ethanol solution for 10 minutes t...

Embodiment 3

[0087] Such as Figure 1-6 Shown, in a preferred embodiment, by Cu-Ni alloy (2.5at.%Ni) single crystal preparation Cu-Ni alloy (2.5at.%Ni) triple crystal used mold and preparation method are as follows:

[0088] The mold used to prepare the three crystals of the present invention is the same as that in Example 1.

[0089] In this embodiment, the preparation of Cu-Ni alloy (2.5at.%Ni) triple crystals using the above-mentioned mold includes the following steps:

[0090] Step 1: Take out the Cu-Ni alloy (2.5 at.% Ni) single crystal, and judge the orientation of the single crystal by X-ray Laue method.

[0091] Step 2: Cut the Cu-Ni alloy (2.5at.%Ni) single crystal into a trapezoidal columnar body by wire cutting to obtain the Cu-Ni alloy (2.5at.%Ni) seed crystal, and the Cu-Ni alloy (2.5at.%Ni) .% Ni) The height of the trapezoidal section of the seed crystal is 2.5mm.

[0092] Step 3: Put the Cu-Ni alloy (2.5at.%Ni) seed crystal into the nitric acid solution and immerse it for...

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Abstract

The invention provides a mold for preparing a tricrystal and a preparation method of the tricrystal, and relates to the field of metal materials. The preparation method specifically comprises the following steps of: cleaning trapezoidal columnar seed crystals with nitric acid, putting the cleaned trapezoidal columnar seed crystals into a specially designed mold in a Bridgman crystal growth furnace, putting a polycrystalline raw material into a raw material barrel, controlling the growth temperature and the heat preservation time of the tricrystal by using a temperature control system, enablingthe molten polycrystalline raw material to flow into the mold, controlling the growth speed of the tricrystal by moving a movable bracket, detecting the orientation of the tricrystal by using an X-ray Laue method, thus obtaining the result that the molten polycrystalline raw material is directionally crystallized along the direction of the seed crystals, and the tricrystal is formed according tothe relative orientation relationship among the seed crystals. The mold adopted by the invention is simple and can be repeatedly used, and the tricrystal body with a preset grain boundary structure can be easily obtained.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a mold for preparing three crystals and a preparation method of the three crystals. Background technique [0002] Trifurcated grain boundaries, as lines where three interfaces intersect, are ubiquitous and important components in materials. The importance of trigeminal grain boundaries in phenomena such as liquid sintering, interfacial infiltration, nucleation, recrystallization, and grain growth has attracted more and more attention. Studies have shown that the grain growth kinetics of nanocrystalline metals is different from that of traditional materials, and the influence of the energy and mobility of the trifurcation grain boundary needs to be considered. Among them, the measurement of the trigeminal grain boundary energy has not been obtained until recent years: The theory and experiments have proved that the energy of the trigeminal grain boundary containing the ...

Claims

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Application Information

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IPC IPC(8): C30B11/00C30B29/02C30B29/52C22C9/06
CPCC22C9/06C30B11/00C30B11/002C30B11/006C30B29/02C30B29/52
Inventor 赵冰冰
Owner SHANGHAI JIAO TONG UNIV
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