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Rare earth magnesium alloy with stable high-temperature strength

A technology of high-temperature strength and rare earth magnesium, which is applied in the field of rare earth magnesium alloys, can solve the problems of excessive strength drop and insufficient heat resistance, and achieve the effects of less rare earth consumption, low cost, and stable high-temperature strength

Inactive Publication Date: 2012-07-25
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current commercial heat-resistant magnesium alloys such as WE54 have the main disadvantages that the heat resistance is not stable enough, and the strength drops more at high temperatures, which cannot fully meet the requirements of aerospace, military, automotive and other industries in a wide range of operating temperatures. It is a higher requirement for strength stability when used at 200°C-300°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The heat-resistant rare earth magnesium alloy with stable high-temperature strength in this embodiment is composed of the following components by mass percentage: 5% Y, 3% Sm, 0.2% Ca, 1% Sb, 0.5% Al, and the balance is Mg and unavoidable Impurities, in which the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.2%. The total content of rare earths (Y and Sm) is 8%.

[0016] The alloy is formulated according to the above ingredients, and the melting and casting process is as follows: melting in a corundum crucible and an intermediate frequency induction furnace. in CO 2 +SF 6 Under the protection of mixed gas, the molten magnesium is heated to 750°C for casting, and a steel mold is used for casting. Finally, Mg-5Y-3Sm-0.2Ca-1Sb-0.5Al cast magnesium alloy is obtained. The heat treatment process is: solution treatment at 525°C for 8 hours, and isothermal aging treatment at 250°C for 16 hours.

[0017] The method for the tensile strength test of the r...

Embodiment 2

[0020] The heat-resistant rare earth magnesium alloy with stable high-temperature strength in this embodiment is composed of the following components by mass percentage: 6% Y, 2% Sm, 0.8% Ca, 0.2% Sb, 1% Al, and the balance is Mg and unavoidable Impurities, in which the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.2%. The total content of rare earths (Y and Sm) is 8%.

[0021] The smelting, heat treatment and tensile strength test methods of the rare earth magnesium alloy with stable high-temperature strength in this embodiment are the same as those in Embodiment 1.

[0022] The rare earth magnesium alloy obtained in this example has a tensile strength of 238MPa at room temperature, an elongation of 3.71%, a tensile strength of 228MPa at 200°C, a tensile strength of 208MPa at 250°C, and a tensile strength of 205MPa at 300°C. The tensile strength of the rare earth magnesium alloy in this example is within 200°C to 300°C, the tensile strength is only reduc...

Embodiment 3

[0024] The heat-resistant rare earth magnesium alloy with stable high-temperature strength in this embodiment is composed of the following components by mass percentage: 8% Y, 1% Sm, 1% Ca, 0.5% Sb, 0.2% Al, and the balance is Mg and unavoidable Impurities, in which the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.2%. The total content of rare earths (Y and Sm) is 9%.

[0025] The smelting, heat treatment and tensile strength test methods of the rare earth magnesium alloy with stable high-temperature strength in this embodiment are the same as those in Embodiment 1.

[0026] The rare earth magnesium alloy obtained in this example has a tensile strength of 243MPa at room temperature, an elongation of 3.42%, a tensile strength of 221MPa at 200°C, a tensile strength of 216MPa at 250°C, and a tensile strength of 198MPa at 300°C. The tensile strength of the rare earth magnesium alloy in this example is within 200°C to 300°C, the tensile strength is only reduc...

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Abstract

The invention discloses a rare earth magnesium alloy with stable high-temperature strength, which comprises the following components in percentage by mass: 5-8% of Y, 1-3% of Sm, 0.2-1% of Ca, 0.2- 1% of Sb, 0.2 -1% of Al and the balance of Mg and unavoidable impurities. The rare earth magnesium alloy disclosed by the invention has extremely stable high-temperature tensile strength which is reduced slightly with the rise of temperature in the range of 200-300 DEG C. The rare earth magnesium alloy disclosed by the invention has tensile strength as high as 266MPa at room temperature, 223MPa at 200 DEG C, 216MPa at 250 DEG C, and 208MPa at 300 DEG C. Compared with commercial heat-resistance magnesium alloy WE54, the rare earth magnesium alloy disclosed by the invention has the advantages of lower cost, more stable high-temperature strength and has wide application prospect in aerospace, automobile industry, military hardware and other fields.

Description

technical field [0001] The invention relates to a rare earth magnesium alloy with stable strength at high temperature. Background technique [0002] Magnesium is the lightest metallic structural material and is increasingly used in automobiles. The use of magnesium alloys in automobiles can reduce weight and reduce exhaust emissions. Therefore, the research and development of magnesium alloys is of great significance for saving energy and suppressing environmental pollution. However, the poor strength and heat resistance of magnesium alloys seriously hinders its application in aerospace, military, automobile and other industries. Therefore, improving the strength and heat resistance of magnesium alloys is an important issue for the development of magnesium alloy materials. [0003] Existing heat-resistant magnesium alloys mainly start with restricting dislocation movement and strengthening grain boundaries. Through proper alloying, by introducing a second phase with high th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06
Inventor 李全安张清李萍张兴渊李长青文九巴
Owner HENAN UNIV OF SCI & TECH
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