A heat-resistant and creep-resistant magnesium alloy and its preparation method

Abstract

The invention relates to a heat-resistant creep-resistant magnesium alloy and a preparing method thereof, which belong to the field of metal materials and metallurgy. The heat-resistant creep-resistant magnesium alloy is mainly formed by the following components in percent by mass: 7-8% of Sm, 0.7-0.9% of Nd, 1.5-2.0% of Zn, 1.0-1.3% of Ca, 1.2-1.5% of Mn, 1.1-1.3% of Al and the balance of Mg and inevitable impurities. The magnesium alloy in the invention has good tensile strength and better creep resistance under a high temperature, and has better application prospect.

Description

technical field

[0001] The invention relates to a heat-resistant and creep-resistant magnesium alloy and a preparation method thereof, belonging to the field of metal materials and metallurgy. Background technique

[0002] Magnesium and magnesium alloys are the lightest metal structural materials in engineering applications. They have significant advantages in many fields, especially in aviation, aerospace and automobiles, motorcycles, and high-speed light rail trains. 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] The existing heat-resistant magnesium alloy development mainly starts with restricting dislocation movement and strengthening grain boundaries. By adding appropriate alloying elements, introducing a sec...

Examples

Embodiment 1

[0035] In this embodiment, the heat-resistant and creep-resistant magnesium alloy is composed of the following components in mass percentage: 7% Sm, 0.8% Nd, 1.8% Zn, 1.0% Ca, 1.5% Mn, 1.1% Al, and the balance is Mg and not Avoid impurities. The inevitable impurity elements are Si, Fe, Cu, Ni; the sum of the mass percentages of Si, Fe, Cu, Ni is less than 0.015%.

[0036] The preparation method of the heat-resistant and creep-resistant magnesium alloy in this embodiment comprises steps:

[0037] (1) Place the pure magnesium, pure aluminum, pure zinc and magnesium samarium master alloy, magnesium neodymium master alloy, magnesium calcium master alloy, magnesium manganese master alloy respectively in the dry box of 200 ℃ for separate preheating, preheat The heating time is 2 hours;

[0038] (2) in CO 2 with SF 6 In the mixed gas atmosphere, melt the magnesium, aluminum and zinc preheated in step (1), and when heated to 740 ° C, add the magnesium samarium master alloy, magnes...

Embodiment 2

[0042] In this embodiment, the heat-resistant and creep-resistant magnesium alloy is composed of the following components in mass percentage: 7.5% Sm, 0.7% Nd, 2.0% Zn, 1.3% Ca, 1.2% Mn, 1.3% Al, and the balance is Mg and not Avoid impurities. The inevitable impurity elements are Si, Fe, Cu, Ni; the sum of the mass percentages of Si, Fe, Cu, Ni is less than 0.015%.

[0043] The preparation method of the heat-resistant and creep-resistant magnesium alloy in this embodiment comprises steps:

[0044] (1) Place the pure magnesium, pure aluminum, pure zinc and magnesium samarium master alloy, magnesium neodymium master alloy, magnesium calcium master alloy, magnesium manganese master alloy respectively in the dry box of 210 ℃ for separate preheating, preheat The heating time is 2 hours;

[0045] (2) in CO 2 with SF 6 In a mixed gas atmosphere, melt the preheated magnesium, aluminum, and zinc in step (1), and when heated to 750°C, add the preheated magnesium samarium master allo...

Embodiment 3

[0049] In this embodiment, the heat-resistant and creep-resistant magnesium alloy is composed of the following components in mass percentage: 7.8% Sm, 0.9% Nd, 1.9% Zn, 1.2% Ca, 1.5% Mn, 1.3% Al, and the balance is Mg and not Avoid impurities. The inevitable impurity elements are Si, Fe, Cu, Ni; the sum of the mass percentages of Si, Fe, Cu, Ni is less than 0.015%.

[0050] The preparation method of the heat-resistant and creep-resistant magnesium alloy in this embodiment comprises steps:

[0051] (1) Place the pure magnesium, pure aluminum, pure zinc and magnesium samarium master alloy, magnesium neodymium master alloy, magnesium calcium master alloy, magnesium manganese master alloy respectively in the dry box of 210 ℃ for separate preheating, preheat The heating time is 2 hours;

[0052] (2) in CO 2 with SF 6 In the mixed gas atmosphere, melt the magnesium, aluminum and zinc preheated in step (1), and when heated to 740 ° C, add the magnesium samarium master alloy, magn...

technical field

[0001] The invention relates to a heat-resistant and creep-resistant magnesium alloy and a preparation method thereof, belonging to the field of metal materials and metallurgy. Background technique

[0002] Magnesium and magnesium alloys are the lightest metal structural materials in engineering applications. They have significant advantages in many fields, especially in aviation, aerospace and automobiles, motorcycles, and high-speed light rail trains. 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] The existing heat-resistant magnesium alloy development mainly starts with restricting dislocation movement and strengthening grain boundaries. By adding appropriate alloying elements, introducing a sec...

Examples

Embodiment 1

[0035] In this embodiment, the heat-resistant and creep-resistant magnesium alloy is composed of the following components in mass percentage: 7% Sm, 0.8% Nd, 1.8% Zn, 1.0% Ca, 1.5% Mn, 1.1% Al, and the balance is Mg and not Avoid impurities. The inevitable impurity elements are Si, Fe, Cu, Ni; the sum of the mass percentages of Si, Fe, Cu, Ni is less than 0.015%.

[0036] The preparation method of the heat-resistant and creep-resistant magnesium alloy in this embodiment comprises steps:

[0037] (1) Place the pure magnesium, pure aluminum, pure zinc and magnesium samarium master alloy, magnesium neodymium master alloy, magnesium calcium master alloy, magnesium manganese master alloy respectively in the dry box of 200 ℃ for separate preheating, preheat The heating time is 2 hours;

[0038] (2) in CO 2 with SF 6 In the mixed gas atmosphere, melt the magnesium, aluminum and zinc preheated in step (1), and when heated to 740 ° C, add the magnesium samarium master alloy, magnes...

Embodiment 2

[0042] In this embodiment, the heat-resistant and creep-resistant magnesium alloy is composed of the following components in mass percentage: 7.5% Sm, 0.7% Nd, 2.0% Zn, 1.3% Ca, 1.2% Mn, 1.3% Al, and the balance is Mg and not Avoid impurities. The inevitable impurity elements are Si, Fe, Cu, Ni; the sum of the mass percentages of Si, Fe, Cu, Ni is less than 0.015%.

[0043] The preparation method of the heat-resistant and creep-resistant magnesium alloy in this embodiment comprises steps:

[0044] (1) Place the pure magnesium, pure aluminum, pure zinc and magnesium samarium master alloy, magnesium neodymium master alloy, magnesium calcium master alloy, magnesium manganese master alloy respectively in the dry box of 210 ℃ for separate preheating, preheat The heating time is 2 hours;

[0045] (2) in CO 2 with SF 6 In a mixed gas atmosphere, melt the preheated magnesium, aluminum, and zinc in step (1), and when heated to 750°C, add the preheated magnesium samarium master allo...

Embodiment 3

[0049] In this embodiment, the heat-resistant and creep-resistant magnesium alloy is composed of the following components in mass percentage: 7.8% Sm, 0.9% Nd, 1.9% Zn, 1.2% Ca, 1.5% Mn, 1.3% Al, and the balance is Mg and not Avoid impurities. The inevitable impurity elements are Si, Fe, Cu, Ni; the sum of the mass percentages of Si, Fe, Cu, Ni is less than 0.015%.

[0050] The preparation method of the heat-resistant and creep-resistant magnesium alloy in this embodiment comprises steps:

[0051] (1) Place the pure magnesium, pure aluminum, pure zinc and magnesium samarium master alloy, magnesium neodymium master alloy, magnesium calcium master alloy, magnesium manganese master alloy respectively in the dry box of 210 ℃ for separate preheating, preheat The heating time is 2 hours;

[0052] (2) in CO 2 with SF 6 In the mixed gas atmosphere, melt the magnesium, aluminum and zinc preheated in step (1), and when heated to 740 ° C, add the magnesium samarium master alloy, magn...

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