A kind of heat-resistant magnesium alloy and preparation method thereof

Abstract

The invention relates to a heat-resisting magnesium alloy and a preparation method thereof, and belongs to the technical field of magnesium alloys. The heat-resisting magnesium alloy is composed of the following components of, by mass, 10-12% of Sm, 0.8-1.0% of Al, 1.2-1.5% of Sn, 1.0-1.2% of Si, 1.5-2.0% of Mn, 0,8-1.0% of Ag, 1.0-1.5% of Zn, 0.43-0.71% of Ca and the balance Mg and inevitable impurities. According to the heat-resisting magnesium alloy, on the basis that 10-12% of the Sm rare earth element is added as the first component, appropriate amounts of additives including the Al, Sn, Si, Mn, Ag, Zn, CaO and the like are introduced, an Mg-Sm alloy is modified in a multicomponent microalloying method, an obtained as-cast alloy is subjected to T6 heat treatment, and the obtained heat-resisting magnesium alloy has excellent high-temperature tensile strength and creep resistance.

Description

technical field

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

[0002] Magnesium and magnesium alloys, as the lightest metal structural materials in engineering applications at the present stage, have low density, high specific strength and specific stiffness, excellent damping and shock absorption performance, and good heat dissipation, and have excellent performance in many fields. Application potential, especially in aerospace, automobiles, motorcycles and high-speed light rail trains, as well as 3C products, it has irreplaceable application advantages.

[0003] At present, commercial magnesium alloys are mainly divided into two categories: cast magnesium alloys and wrought magnesium alloys. In cast magnesium alloys, the AZ series is widely used due to its excellent mechanical properties at room temperature, good fluidity, small heating tendency...

Examples

Embodiment 1

[0036] The heat-resistant magnesium alloy of this embodiment is composed of the following components in mass percentage: 10% Sm, 0.9% Al, 1.5% Sn, 1.2% Si, 2.0% Mn, 0.9% Ag, 1.4% Zn, 0.64% Ca, the balance For Mg and unavoidable impurities.

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

[0038] 1) Ingredients: According to the weight of raw materials calculated according to the above weight percentage content, weigh pure magnesium, pure aluminum, pure tin, pure silver, pure zinc, master alloys Mg-Sm, Mg-Si, Mg-Mn and 3 μm particle size Calcium oxide particles, and place the raw material in a drying oven at 200°C for drying and preheating, and the preheating time is 2 hours;

[0039] 2) in CO 2 +SF 6 Under the protection of mixed gas, heat and melt the preheated pure magnesium, pure aluminum, pure tin, pure silver, and pure zinc, and then add master alloys Mg-Sm, Mg-Si, Mg-Mn and particle size when heat...

Embodiment 2

[0043] The heat-resistant magnesium alloy of this embodiment is composed of the following components in mass percentage: 11% Sm, 1.0% Al, 1.4% Sn, 1.0% Si, 1.6% Mn, 1.0% Ag, 1.0% Zn, 0.71% Ca, the balance For Mg and unavoidable impurities.

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

[0045] 1) Ingredients: According to the weight of raw materials calculated according to the above weight percentage content, weigh pure magnesium, pure aluminum, pure tin, pure silver, pure zinc, master alloys Mg-Sm, Mg-Si, Mg-Mn and 4 μm particle size Calcium oxide particles, and put the raw materials in a drying oven at 210°C for drying and preheating, and the preheating time is 3 hours;

[0046] 2) in CO 2 +SF 6 Under the protection of mixed gas, heat and melt the preheated pure magnesium, pure aluminum, pure tin, pure silver, and pure zinc, and then add master alloys Mg-Sm, Mg-Si, Mg-Mn and particle size when heated ...

Embodiment 3

[0050] The heat-resistant magnesium alloy of this embodiment is composed of the following components in mass percentage: 12% Sm, 0.8% Al, 1.2% Sn, 1.0% Si, 1.5% Mn, 0.8% Ag, 1.2% Zn, 0.43% Ca, the balance For Mg and unavoidable impurities.

[0051] The preparation method of the present embodiment heat-resistant magnesium alloy comprises the following steps:

[0052] 1) Ingredients: According to the weight of raw materials calculated according to the above weight percentage content, weigh pure magnesium, pure aluminum, pure tin, pure silver, pure zinc, master alloys Mg-Sm, Mg-Si, Mg-Mn and 5 μm particle size Calcium oxide particles, and the raw materials are placed in a drying oven at 220°C for drying and preheating, and the preheating time is 2 hours;

[0053] 2) in CO 2 +SF 6 Under the protection of mixed gas, heat and melt the preheated pure magnesium, pure aluminum, pure tin, pure silver, and pure zinc, and then add master alloys Mg-Sm, Mg-Si, Mg-Mn and particle size whe...

technical field

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

[0002] Magnesium and magnesium alloys, as the lightest metal structural materials in engineering applications at the present stage, have low density, high specific strength and specific stiffness, excellent damping and shock absorption performance, and good heat dissipation, and have excellent performance in many fields. Application potential, especially in aerospace, automobiles, motorcycles and high-speed light rail trains, as well as 3C products, it has irreplaceable application advantages.

[0003] At present, commercial magnesium alloys are mainly divided into two categories: cast magnesium alloys and wrought magnesium alloys. In cast magnesium alloys, the AZ series is widely used due to its excellent mechanical properties at room temperature, good fluidity, small heating tendency...

Examples

Embodiment 1

[0036] The heat-resistant magnesium alloy of this embodiment is composed of the following components in mass percentage: 10% Sm, 0.9% Al, 1.5% Sn, 1.2% Si, 2.0% Mn, 0.9% Ag, 1.4% Zn, 0.64% Ca, the balance For Mg and unavoidable impurities.

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

[0038] 1) Ingredients: According to the weight of raw materials calculated according to the above weight percentage content, weigh pure magnesium, pure aluminum, pure tin, pure silver, pure zinc, master alloys Mg-Sm, Mg-Si, Mg-Mn and 3 μm particle size Calcium oxide particles, and place the raw material in a drying oven at 200°C for drying and preheating, and the preheating time is 2 hours;

[0039] 2) in CO 2 +SF 6 Under the protection of mixed gas, heat and melt the preheated pure magnesium, pure aluminum, pure tin, pure silver, and pure zinc, and then add master alloys Mg-Sm, Mg-Si, Mg-Mn and particle size when heat...

Embodiment 2

[0043] The heat-resistant magnesium alloy of this embodiment is composed of the following components in mass percentage: 11% Sm, 1.0% Al, 1.4% Sn, 1.0% Si, 1.6% Mn, 1.0% Ag, 1.0% Zn, 0.71% Ca, the balance For Mg and unavoidable impurities.

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

[0045] 1) Ingredients: According to the weight of raw materials calculated according to the above weight percentage content, weigh pure magnesium, pure aluminum, pure tin, pure silver, pure zinc, master alloys Mg-Sm, Mg-Si, Mg-Mn and 4 μm particle size Calcium oxide particles, and put the raw materials in a drying oven at 210°C for drying and preheating, and the preheating time is 3 hours;

[0046] 2) in CO 2 +SF 6 Under the protection of mixed gas, heat and melt the preheated pure magnesium, pure aluminum, pure tin, pure silver, and pure zinc, and then add master alloys Mg-Sm, Mg-Si, Mg-Mn and particle size when heated ...

Embodiment 3

[0050] The heat-resistant magnesium alloy of this embodiment is composed of the following components in mass percentage: 12% Sm, 0.8% Al, 1.2% Sn, 1.0% Si, 1.5% Mn, 0.8% Ag, 1.2% Zn, 0.43% Ca, the balance For Mg and unavoidable impurities.

[0051] The preparation method of the present embodiment heat-resistant magnesium alloy comprises the following steps:

[0052] 1) Ingredients: According to the weight of raw materials calculated according to the above weight percentage content, weigh pure magnesium, pure aluminum, pure tin, pure silver, pure zinc, master alloys Mg-Sm, Mg-Si, Mg-Mn and 5 μm particle size Calcium oxide particles, and the raw materials are placed in a drying oven at 220°C for drying and preheating, and the preheating time is 2 hours;

[0053] 2) in CO 2 +SF 6 Under the protection of mixed gas, heat and melt the preheated pure magnesium, pure aluminum, pure tin, pure silver, and pure zinc, and then add master alloys Mg-Sm, Mg-Si, Mg-Mn and particle size whe...

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