Preparation method of yttria dispersion strengthened copper alloy

A technology of dispersion strengthening copper and yttrium trioxide, applied in the field of metal matrix composite materials and preparation, which can solve problems such as complex process, low diffusion efficiency, and component deviation, and achieve simple process, high diffusion efficiency, and uniform components Effect

Active Publication Date: 2019-07-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the deficiencies in the existing ODS-Cu alloy preparation methods: (1) the process is complicated, the cycle is long, the influence factors are many, and the efficiency is low; (2) the oxide melting and floating phenomenon caused by the large difference in the specific gravity of the components; ( 3) Strengthening phase segregation and particle size in the alloy are difficult to control precisely; (4) Composition deviation caused by volatilization of rare earth elements at high temperature; (5) Small oxygen solid solubility limit and low diffusion efficiency in solid crystals

Method used

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  • Preparation method of yttria dispersion strengthened copper alloy
  • Preparation method of yttria dispersion strengthened copper alloy
  • Preparation method of yttria dispersion strengthened copper alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 ODS-Cu alloy with nominal composition Cu -0.3 wt. % Y

[0019] Step 1: Prepare the composition as Cu 75 Y 25 Alloy ingots with amorphous strips:

[0020] Using Cu (99.99%), Y (99.9%) metal raw materials, by weight percentage Cu 75 Y 25 To prepare Cu-Y alloy, mix the weighed metal raw materials and place them in the water-cooled copper crucible of the non-consumable arc melting furnace, and then evacuate to 5×10 -3 ~1×10 -2 Pa, and then filled with 0.01-0.08 MPa of pure argon protective gas for melting, the working current of the arc melting is 50-200 A; then the alloy ingot is turned upside down, and the melting is repeated 3 times to obtain an alloy ingot with uniform composition;

[0021] The alloy ingot was crushed and put into a quartz tube, and Cu-Y amorphous was prepared by vacuum copper roller single-roller spin quenching technology. The size of the quartz tube nozzle is about 1-1.5 mm in diameter. Place the charged quartz tube in the induction...

Embodiment 2

[0028] Example 2 ODS-Cu alloy with nominal composition Cu -0.6 wt. % Y

[0029] Step 1: Prepare the composition as Cu 65 Y 35 Alloy ingots with amorphous strips:

[0030] Same as Step 1 in Embodiment 1. Cu is measured here 65 Y 35 The crystallization temperature Tx of the amorphous is 290°C.

[0031] Step 2: Cu 65 Y 35 Oxidation of amorphous strips:

[0032] Same as Step 2 in Embodiment 1. Cu here 65 Y 35 The oxidation treatment temperature of the amorphous is 250°C, and the temperature is kept for 3 h.

[0033] Step 3: Melting and preparing ODS-Cu alloy

[0034] Same as Step 3 in Embodiment 1. The microstructure is similar to that of the alloy in Example 1, and the particles of the oxide strengthening phase are slightly smaller, but the distribution density is nearly 30% higher than that of the former. The performance test results show that the ODS-Cu alloy with Cu-0.6 wt. % Y has a hardness of 62 HV0.2 / 20 and a room temperature tensile strength of 675 MPa, but ...

Embodiment 3

[0035] Example 3 ODS-Cu alloy with nominal composition Cu -1.0 wt. % Y

[0036] Step 1: Prepare the composition as Cu 50 Y 50 Alloy ingots with amorphous strips:

[0037] Same as Step 1 in Embodiment 1. Cu is measured here 50 Y 50 The crystallization temperature Tx of the amorphous is 230°C.

[0038] Step 2: Cu 50 Y 50 Oxidation of amorphous strips:

[0039] Same as Step 2 in Embodiment 1. Cu here 50 Y 50 The oxidation treatment temperature of the amorphous is 200°C, and the temperature is kept for 5 h.

[0040] Step 3: Melting and preparing ODS-Cu alloy

[0041] Same as Step 3 in Embodiment 1. The microstructure is similar to that of the alloy in Example 1, the oxide particles are more dispersed, and the phase distribution density is also larger, which is 50% higher than the former. The performance test results show that the ODS-Cu alloy with Cu -1.0 wt. % Y has a hardness of 63.5HV0.2 / 20 and a tensile strength of over 700MPa at room temperature, reaching 705MPa...

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Abstract

The invention relates to a preparation method of yttria dispersion strengthened copper alloy, and belongs to the technical field of new materials. By oxidizing Cu-Y amorphous master alloy, Cu-Y2O3 combination with the specific gravity close to the specific gravity of matrix Cu is obtained in advance, and ODS-Cu alloy with uniform and controllable structure is obtained by directly smelting the combination. The method has the main advantages that (1), the problem of Y2O3 powder floating caused by the large difference between the specific gravities of the oxide and the matrix during smelting in the prior art is overcome; (2), the advantages of amorphous structure, homogeneous composition, and large solid solubility and high diffusion efficiency of oxygen in the alloy are brought into play toaccurately control oxygen addition amount of the alloy, and effective regulation and control of the size, number density, morphology and distribution of Y2O3 reinforced particles are realized; (3), the ODS-Cu alloy with uniform structure is directly obtained through a casting process, and the casting process is simple, efficient, controllable and easy to realize for large-scale production; and (4), the Y2O3 dispersion strengthened high-strength high-conductivity copper alloy prepared by the method has room-temperature conductivity greater than 90% IACS and tensile strength greater than 650 MPa.

Description

technical field [0001] The present invention relates to a kind of diyttrium trioxide (Y 2 o 3 ) The preparation method of dispersion strengthened copper alloy belongs to the field of metal matrix composite material and preparation technology. Background technique [0002] High-strength and high-conductivity copper alloy materials have broad application prospects in aerospace, high-speed rail, integrated circuits, and nuclear fusion. It belongs to new copper alloy materials, mainly including precipitation strengthened copper (PH-Cu) alloy and dispersion strengthened copper (DS-Cu) alloy. The precipitation phase precipitated in the PH-Cu alloy represented by CuCrZr alloy often has a coherent relationship with the matrix, and the strengthening effect is excellent. However, the biggest problem facing the PH-Cu alloy is that the thermal stability of the precipitated phase is poor. When the service temperature is high, the precipitated phase will be melted back and coarsened, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C32/00C22C1/10B22D11/06C22C45/00
CPCC22C9/00C22C45/001C22C45/00B22D11/0611C22C1/1036C22C32/0021C22C1/11
Inventor 王英敏羌建兵陈修彤刘歆翌
Owner DALIAN UNIV OF TECH
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