High-strength creep resistant magnesium alloy

A technology of creep resistance and magnesium alloy, which is applied in the field of alloy materials, can solve problems such as high-temperature strength and excellent high-temperature creep resistance, and achieve low production costs, excellent high-temperature creep resistance, and ensure safety and reliability. Effect

Inactive Publication Date: 2015-01-21
HENAN UNIV OF SCI & TECH
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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 provide a high-strength creep-resistant magnesium alloy to solve the problem that existing magnesium alloys cannot simultaneously take into account higher high-temperature strength and excellent high-temperature creep resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The high-strength creep-resistant magnesium alloy of this embodiment is composed of the following components by mass percentage: 4.0% Y, 2.5% Sm, 0.3% Sb, the total mass percentage of impurity elements Si, Fe, Cu, Ni is less than 0.2%, and the rest The amount is Mg. The sum of the mass percentages of Y and Sm is 6.5%.

[0017] The high-strength creep-resistant magnesium alloy of this embodiment is formed by melting and casting magnesium, antimony and intermediate alloys Mg-Y and Mg-Sm as raw materials and undergoing solid solution and aging heat treatment, specifically:

[0018] The alloy is formulated according to the above ingredients, and the melting and casting process is as follows: using a corundum crucible and an intermediate frequency induction furnace, in CO 2 +SF 6 Melting under the protection of mixed gas, when the temperature of magnesium liquid rises to 750°C, it is cast into a steel mold to obtain Mg-4.0Y-2.5Sm-0.3Sb as-cast alloy, followed by heat treat...

Embodiment 2

[0022] The high-strength creep-resistant magnesium alloy of this embodiment is composed of the following components by mass percentage: 4.5% Y, 1.5% Sm, 0.5% Sb, the total mass percentage of impurity elements Si, Fe, Cu, Ni is less than 0.2%, and the remaining The amount is Mg. The sum of the mass percentages of Y and Sm is 6.0%.

[0023] The high-strength creep-resistant magnesium alloy of this embodiment is made by melting and casting magnesium, antimony and intermediate alloys Mg-Y and Mg-Sm as raw materials, and undergoing solid solution and aging heat treatment. Concrete casting method, heat treatment process and tensile, creep test method are the same as embodiment 1.

[0024] The high-strength creep-resistant magnesium alloy obtained in this example has a tensile strength of 180MPa at 300°C and a steady-state creep rate of 4.0×10 at 300°C / 50MPa. -8 the s -1 .

Embodiment 3

[0026] The high-strength creep-resistant magnesium alloy of this embodiment is composed of the following components by mass percentage: 5.0% Y, 2.0% Sm, 0.2% Sb, the total mass percentage of impurity elements Si, Fe, Cu, Ni is less than 0.2%, and the rest The amount is Mg. The sum of the mass percentages of Y and Sm is 7.0%.

[0027] The high-strength creep-resistant magnesium alloy of this embodiment is made by melting and casting magnesium, antimony and intermediate alloys Mg-Y and Mg-Sm as raw materials, and undergoing solid solution and aging heat treatment. Concrete casting method, heat treatment process and tensile, creep test method are the same as embodiment 1.

[0028] The high-strength creep-resistant magnesium alloy of this embodiment has a tensile strength of 194MPa at 300°C and a steady-state creep rate of 2.9×10 at 300°C / 50MPa. -8 the s -1 .

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Abstract

The invention discloses a high-strength creep resistant magnesium alloy. The magnesium alloy comprises, by mass, 4.0-5.0% of Y, 1.5-2.5% of Sm, 0.2-0.5% of Sb, and the balance of Mg and inevitable impurities. The component of the high-strength creep resistant magnesium alloy is Mg-Y-Sm-Sb, the high-strength creep resistant magnesium alloy has high high-temperature strength and excellent high temperature creep resistance, has a tensile strength at 300DEG C of 180MPa or more, and has a steady creep rate under 300DEG C/50MPa conditions of 4.0*10<-8> s<-1> or less, so the work safety and reliability of the magnesium alloy under high temperature conditions is guaranteed; and the species of alloy elements, especially rare earth elements is less, and the content is low, so the melting and casting difficulty of the magnesium alloy is greatly reduced, the quality of the alloy is well controlled, the production cost is low, and the alloy has wide application prospects in the aviation and spaceflight fields, the automobile industry and the like.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a high-strength creep-resistant magnesium alloy. Background technique [0002] Magnesium and magnesium alloys are the lightest metal structural materials in engineering applications. They have very significant advantages in many application fields, especially irreplaceable advantages in the automotive industry, aerospace and other aspects. However, the poor high-temperature strength and creep resistance of ordinary magnesium alloys seriously hinders its application in the automotive industry, aerospace and other fields. Therefore, improving the high temperature strength and creep resistance of magnesium alloys has become an important issue in the development of magnesium alloy materials. [0003] Existing research on high-strength creep-resistant magnesium alloys mainly starts with restricting dislocation movement and strengthening grain boundaries. Through a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06
CPCC22C23/06
Inventor 张清李全安陈君付三玲朱宏喜张兴渊
Owner HENAN UNIV OF SCI & TECH
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