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LPSO-phase strengthened degradable high-temperature magnesium alloy and preparation method thereof

A magnesium alloy, high temperature technology, applied in the field of magnesium alloys, can solve the problems of high temperature mechanical properties and unsatisfactory degradation rate

Active Publication Date: 2020-06-05
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of unsatisfactory high-temperature mechanical properties and degradation rate in the prior art, the present invention provides a degradable high-temperature magnesium alloy strengthened by LPSO phase and its preparation method, which has excellent high-temperature resistance and degradation rate

Method used

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  • LPSO-phase strengthened degradable high-temperature magnesium alloy and preparation method thereof

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Embodiment 1

[0031] The chemical composition of the magnesium alloy in this embodiment is: Gd 8wt%, Ho 4wt%, Cu 0.86wt%, Ni 0.43%, Zn 0.215wt%, Zr 0.2wt%, and the balance is Mg.

[0032] The invention discloses a preparation method of an LPSO phase-strengthened degradable high-temperature magnesium alloy, which comprises the following steps:

[0033]Step 1: Pure magnesium ingot (>99.99wt%), pure gadolinium ingot (>99.99wt%), pure holmium ingot (>99.99wt%), pure copper ingot (>99.99wt%), pure nickel ingot (>99.99wt%) %), zinc ingot (>99.99wt%) and magnesium-30wt% zirconium master alloy as raw materials, the total amount of raw materials is 5kg;

[0034] Step 2: Preheat and dry the raw materials in step 1 at 200°C, then place the magnesium ingot in a low-carbon steel crucible in a resistance furnace and heat it to 750°C to melt and form magnesium liquid, then sequentially place the preheated gadolinium ingot, Add holmium ingots, copper ingots, nickel ingots, zinc ingots, and magnesium-zirco...

Embodiment 2

[0037] The chemical composition of the magnesium alloy in this embodiment is: Gd 10wt%, Ho 5wt%, Cu 2.4wt%, Ni 1.2%, Zn 0.6wt%, Zr 0.5wt%, and the balance is Mg.

[0038] The invention discloses a preparation method of an LPSO phase-strengthened degradable high-temperature magnesium alloy, which comprises the following steps:

[0039] Step 1: Pure magnesium ingot (>99.99wt%), pure gadolinium ingot (>99.99wt%), pure holmium ingot (>99.99wt%), pure copper ingot (>99.99wt%), pure nickel ingot (>99.99wt%) %), zinc ingot (>99.99wt%) and magnesium-30wt% zirconium master alloy as raw materials, the total amount of raw materials is 5kg;

[0040] Step 2: Preheat and dry the raw materials in step 1 at 200°C, then place the magnesium ingot in a low-carbon steel crucible in a resistance furnace and heat it to 750°C to melt and form magnesium liquid, then sequentially place the preheated gadolinium ingot, Add holmium ingots, copper ingots, nickel ingots, zinc ingots, and magnesium-zirconi...

Embodiment 3

[0043] The chemical composition of the magnesium alloy in this embodiment is: Gd 12wt%, Ho 6wt%, Cu 3.2wt%, Ni 1.6%, Zn 0.8wt%, Zr 0.8wt%, and the balance is Mg.

[0044] The invention discloses a preparation method of an LPSO phase-strengthened degradable high-temperature magnesium alloy, which comprises the following steps:

[0045] Step 1: Pure magnesium ingot (>99.99wt%), pure gadolinium ingot (>99.99wt%), pure holmium ingot (>99.99wt%), pure copper ingot (>99.99wt%), pure nickel ingot (>99.99wt%) %), zinc ingot (>99.99wt%) and magnesium-30wt% zirconium master alloy as raw materials, the total amount of raw materials is 5kg;

[0046] Step 2: Preheat and dry the raw materials in step 1 at 200°C, then place the magnesium ingot in a low-carbon steel crucible in a resistance furnace and heat it to 750°C to melt and form magnesium liquid, then sequentially place the preheated gadolinium ingot, Add holmium ingots, copper ingots, nickel ingots, zinc ingots, and magnesium-zirconi...

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Abstract

The invention discloses an LPSO-phase strengthened degradable high-temperature magnesium alloy and a preparation method thereof. The magnesium alloy comprises components in percentage by weight as follows: 12%-18% of rare earth elements (Gd and Ho), 1.5%-6% of transitional elements (Cu, Ni and Zn), 0.2%-0.8% of Zr and the balance Mg. The LPSO phase of the magnesium alloy has a special long-periodstructure, and according to dislocation and grain boundary hindrance effects, dynamic recrystallization promoting effect, grain size refining effect and coordination deformation of the LPSO phase, comprehensive mechanical properties of the alloy can be improved. The preparation method of the magnesium alloy adopts a semi-continuous casting process and a homogenizing treatment and extrusion process, the magnesium alloy with room-temperature tensile strength of 330 MPa or higher, room-temperature elongation of 15% or higher, 150-DEG C tensile strength of 300 MPa or higher, 150-DEG C elongation of 20% or higher, high mechanical properties and good degradation rate is obtained. The LPSO-phase strengthened degradable high-temperature magnesium alloy can be widely applied to a packer tool bridgeplug for fracturing construction of oil and gas fields.

Description

technical field [0001] The invention relates to nonferrous metal material technology, belongs to the field of magnesium alloys, and in particular relates to a degradable high-temperature magnesium alloy strengthened by LPSO phase and a preparation method thereof. Background technique [0002] In the development of oil and gas fields, the development of fracturing technology and related tools for low permeability oil and gas reservoirs has gradually become a hot spot. Bridge plugs are an important tool for staged fracturing and isolation of horizontal wells, but all bridge plugs need to be drilled and ground after fracturing to open oil and gas channels and keep the wellbore unblocked. However, during the fracturing construction process, problems such as casing deformation are prone to occur, resulting in long drilling plug cycles and high construction costs. [0003] With the development of industry, magnesium alloys are gradually used as degradable materials due to their h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03E21B33/134
CPCC22C1/03C22C23/06E21B33/134
Inventor 房大庆郭利君吕文雪刘佳南丁向东孙军
Owner XI AN JIAOTONG UNIV
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