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A kind of anti-creep rare earth magnesium alloy and preparation method thereof

A rare earth magnesium and creep resistance technology, which is used in the preparation of creep resistance rare earth magnesium alloys and the field of creep resistance rare earth magnesium alloys, and can solve problems such as inability to meet application requirements.

Active Publication Date: 2017-08-25
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The obtained magnesium alloy has good plasticity, high temperature strength and creep resistance, but under the creep condition of 250℃ / 80MPa, the steady-state creep rate is basically 1.0×10 -8 the s -1 Above, in the application fields with relatively high requirements on creep resistance performance, this magnesium alloy can not meet the requirements of use.

Method used

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  • A kind of anti-creep rare earth magnesium alloy and preparation method thereof

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Embodiment 1

[0029] The creep-resistant rare earth magnesium alloy of this embodiment consists of the following components in mass percentage: 2.5% Sm, 1.8% Nd, 2.7% Gd, 1.5% Zr, 0.9% Ca, 1.2% Ag, 0.5% Sb, 0.4% Er, the balance is Mg and unavoidable impurities.

[0030] The preparation method of the creep-resistant rare earth magnesium alloy of the present embodiment comprises the following steps:

[0031] 1) Put raw materials pure magnesium, pure silver, pure antimony and master alloy Mg-Nd, master alloy Mg-Gd, master alloy Mg-Sm, master alloy Mg-Er, master alloy Mg-Zr, master alloy Mg-Ca Dry and preheat in a drying oven at 200°C, and the preheating time is 2 hours;

[0032] 2) Put the preheated pure magnesium, pure silver and pure antimony in CO 2 +SF 6 Melt under the protection of mixed gas, add master alloy Mg-Nd, master alloy Mg-Gd, master alloy Mg-Sm, master alloy Mg-Er, master alloy Mg-Zr, master alloy Mg-Ca when heated to 740°C, keep warm for 10min After the alloy is completely ...

Embodiment 2

[0036] The creep-resistant rare earth magnesium alloy of this embodiment consists of the following components in mass percentage: 3.6% Sm, 1.1% Nd, 1.3% Gd, 1.7% Zr, 1.1% Ca, 0.7% Ag, 0.7% Sb, 0.9% Er, the balance is Mg and unavoidable impurities.

[0037] The preparation method of the creep-resistant rare earth magnesium alloy of the present embodiment comprises the following steps:

[0038] 1) Put raw materials pure magnesium, pure silver, pure antimony and master alloy Mg-Nd, master alloy Mg-Gd, master alloy Mg-Sm, master alloy Mg-Er, master alloy Mg-Zr, master alloy Mg-Ca Dry and preheat in a drying oven at 220°C, and the preheating time is 1.5h;

[0039] 2) Put the preheated pure magnesium, pure silver and pure antimony in CO 2 +SF 6 Melt under the protection of mixed gas, add master alloy Mg-Nd, master alloy Mg-Gd, master alloy Mg-Sm, master alloy Mg-Er, master alloy Mg-Zr, master alloy Mg-Ca when heated to 730°C, keep warm for 10min After the alloy is completely mel...

Embodiment 3

[0043] The creep-resistant rare earth magnesium alloy of this embodiment consists of the following components in mass percentage: 4.2% Sm, 0.3% Nd, 3.1% Gd, 2.1% Zr, 0.2% Ca, 0.3% Ag, 0.9% Sb, 0.3% Er, the balance is Mg and unavoidable impurities.

[0044] The preparation method of the creep-resistant rare earth magnesium alloy of the present embodiment comprises the following steps:

[0045] 1) Put raw materials pure magnesium, pure silver, pure antimony and master alloy Mg-Nd, master alloy Mg-Gd, master alloy Mg-Sm, master alloy Mg-Er, master alloy Mg-Zr, master alloy Mg-Ca Dry and preheat in a drying oven at 210°C, and the preheating time is 2 hours;

[0046] 2) Put the preheated pure magnesium, pure silver and pure antimony in CO 2 +SF 6 Melt under the protection of mixed gas, add master alloy Mg-Nd, master alloy Mg-Gd, master alloy Mg-Sm, master alloy Mg-Er, master alloy Mg-Zr, master alloy Mg-Ca when heated to 735°C, keep warm for 10min After the alloy is completely ...

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Abstract

The invention discloses an anti-creep rare earth magnesium alloy and a preparation method thereof. The magnesium alloy consists of the following components in percentage by mass: 2-6% of Sm, 0.2-2.2% of Nd, 0.5-3.5% of Gd, 1.2-2.4% of Zr, 0.2-1.5% of Ca, 0.2-1.4% of Ag, 0.3-1.1% of Sb, 0.2-1.3% of Er, and the balance of Mg and inevitable impurities. The anti-creep rare earth magnesium alloy is higher in room temperature and high-temperature mechanical performance; under the creep condition of 250 DEG C / 100 MPa, the creep quantity is decreased to 0.15%, and the stable creep speed is decreased to 5.14*10-9s-1; and the magnesium alloy is excellent in high-temperature creep resistance, lower in total content of rare earth, low in cost, uniform in microscope structure and suitable for the engineering field having higher high-temperature creep resistance requirement on the magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloys, in particular to a creep-resistant rare-earth magnesium alloy, and also to a preparation method of the creep-resistant rare-earth magnesium alloy. Background technique [0002] As the lightest metal structural materials in engineering applications, magnesium and magnesium alloys have low density, high specific strength and specific stiffness, excellent damping and shock absorption performance, and good heat dissipation. They have very significant advantages in many fields of application , especially in aerospace, automobiles, motorcycles, and high-speed light rail trains, it has irreplaceable advantages. However, the poor high-temperature mechanical properties of magnesium alloys seriously hinder their application in aerospace, military, automobile and other industries. Therefore, improving the mechanical and heat resistance properties of magnesium alloys is an important issue for the de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03
Inventor 李全安陈君张清李梅菊朱宏喜周耀严景龙
Owner HENAN UNIV OF SCI & TECH
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