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A technology for magnesium alloys and master alloys, applied in the field of magnesium alloys doped with rare earth elements and its preparation, can solve the problems of limited application, singleness, and inability to have good corrosion resistance, mechanical properties, and welding strength at the same time
Active Publication Date: 2015-06-24
BYD CO LTD
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[0005] However, the above-mentioned magnesium alloys in the prior art show good single performance, and cannot have good corrosion resistance, mechanical properties and welding strength at the same time, and as a material widely used in engineering, it must meet various complex working conditions requirements, which requires that alloy materials must have good comprehensive properties, so the industrial application of existing magnesium alloys is limited
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Embodiment 1
[0025] Embodiment 1: A kind of magnesium alloy doped with rare earth, its composition and percentage by weight are Al: 5%, Zn: 0.5%, Mn: 1.0%, Ce: 0.5%, La: 0.27%, Y: 0.5%, The total amount of impurity elements Fe, Cu and Ni is 0.013%, the content of Fe is 0.004%, and the balance is magnesium.
[0026] The magnesium alloy preparation method of this embodiment is carried out according to the following steps, and the corresponding raw materials are weighed according to the above ratio.
[0027] 1) Preparation of Mg-Ce-La master alloy: N2, SF6 mixed gas pressure under a protective atmosphere of 0.4MPa, put some magnesium ingots in a crucible, heat to 700-740°C, and wait until the magnesium ingots are completely melted. Then add lanthanum-cerium mixed rare earth (the composition is La35.9Ce64.1). After the rare earth is completely melted, keep it warm for 30 minutes, and pour the melt into the metal mold to obtain the Mg-Ce-La master alloy.
[0028] 2) Preparation of Mg-Y master ...
Embodiment 2
[0030]Embodiment 2: a kind of magnesium alloy doped with rare earth, its composition and percentage by weight are Al: 5.5%, Zn: 0%, Mn: 1.5%, Ce: 0.15%, La: 0.08%, Y: 1.0%, The total amount of impurity elements Fe, Cu and Ni is 0.014%, the content of Fe is 0.004%, and the balance is magnesium.
[0031] The preparation method of the magnesium alloy in this example is the same as in Example 1, and the magnesium alloy casting or ingot E2 of the present invention is obtained.
Embodiment 3
[0032] Embodiment 3: a kind of magnesium alloy doped with rare earth, its composition and percentage by weight are Al: 6.0%, Zn: 0.5%, Mn: 0.5%, Ce: 0.3%, La: 0.16%, Y: 1.0%, The total amount of impurity elements Fe, Cu and Ni is 0.013%, the content of Fe is 0.003%, and the balance is magnesium.
[0033] The preparation method of the magnesium alloy in this example is the same as in Example 1, and the magnesium alloy casting or ingot E3 of the present invention is obtained.
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Abstract
The invention provides a rare earth element-doped magnesium alloy, which comprises the following specific components in percentage by weight: 5-7.5% of Al, 0-1.0% of Zn, 0.1-1.5% of Mn, 0.15-1.0% of Ce, 0.08-0.54% of La, 0.1-1.0% of Y, impurity elements and the balance of magnesium, wherein the total content of Fe, Cu and Ni in the impurity elements is less than 0.015%, and Fe content is not more than 0.005%. The invention also relates to a preparation method of the magnesium alloy. According to the invention, the traditional magnesium alloy is simultaneously doped with rare earth elements Ce, La and Y and the weight percentages of Ce, La and Y in the alloy are controlled, thus the overall comprehensive performances of the magnesium alloy are improved; and through testing, the magnesium alloy has stronger corrosion resistance and has good mechanical properties and welding strength.
Description
technical field [0001] The invention relates to a magnesium alloy doped with rare earth elements and a preparation method thereof. Background technique [0002] Magnesium alloy is known as "the green engineering material of the 21st century", which has a series of advantages such as high strength, strong electromagnetic shielding ability, good damping, shock absorption, thermal conductivity and machinability. However, the large-scale application of magnesium alloys as engineering materials is seriously hindered due to the active chemical properties of magnesium, poor corrosion resistance, and low welding strength. [0003] According to the research work of Xia Lanting et al. (Xia Lanting, Gao Shan, Luo Xiaoping, Zang Dongmian, "Analysis of Factors Affecting Corrosion Properties of Magnesium Alloys", "Casting", 1001-4977 (2005) 08-0794-03), it is known that the influence of magnesium Alloy corrosion factors mainly include alloy composition and heat treatment state. When the ...
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