High-strength high-ductility Mg-Al-Mn die-casting magnesium alloy containing lanthanum-cerium mixed rear earth

Abstract

The invention provides a high-strength high-toughness Mg-Al-Mn die cast magnesium alloy containing lanthanum-cerium rare earth compound, which is composed of 97% to 90% by mass of AM60 magnesium alloyand 3% to 10% by mass of magnesium-lanthanum cerium interalloy in a proportion of 3% to 10%. The magnesium-lanthanum cerium interalloy is prepared by 80% by mass of magnesium ingot and 20% by weightof lanthanum-cerium rare earth compound; the lanthanum-cerium rare earth compound is the residual lanthanum-cerium rare earth compound after Pr and Nd are separated from cerium-rich rare earth compound, composed of 20% to 80% by mass of Ce, 80% to 20% by mass of La and no more than 1% of other rare earth elements. Comparing the preparing method with that of traditional magnesium alloy, the differences lies in: magnesium-lanthanum cerium interalloy is first prepared, and then magnesium-lanthanum cerium interalloy is added during smelting process. The rare earth has small lose, is easy to control its compositions, the smelting time is shorted, thus to improve the alloy quality.

Description

technical field

[0001] The invention relates to a method for preparing a high-strength and high-toughness Mg-Al-Mn die-casting magnesium alloy containing lanthanum-cerium mixed rare earth, and belongs to the field of metal materials. Background technique

[0002] With the development of the automobile industry, the current application of magnesium alloys has expanded from small parts such as covers to large components and power systems, which puts forward higher requirements for the strength, plasticity and damping performance of magnesium alloys. The Mg-Al-Mn alloy represented by AM60 has been widely used due to its excellent casting process performance, good plasticity, and good shock absorption performance. However, such alloys also have inherent performance shortcomings of low strength and poor corrosion resistance, which limit their further application. In order to solve these shortcomings, rare earth elements are introduced into the alloy system in order to improve it...

Examples

Embodiment 1

[0018] Embodiment 1AM60+CeLa (Ce=0.2, La=0.3) die-casting magnesium alloy

[0019] The preparation method of AM60+CeLa (Ce=0.2, La=0.3) die-casting magnesium alloy is as follows:

[0020] 1. Preparation of magnesium-lanthanum-cerium master alloy: according to the mass ratio of 80% magnesium and 20% mixed rare earth raw materials, the magnesium ingot and mixed rare earth raw materials are put into a cast iron or graphite crucible, heated and melted, and the temperature is raised to 780°C. Stir evenly and cast into a magnesium-lanthanum-cerium master alloy ingot. SF is introduced into the smelting process 6 :CO 2 Protective gas with a volume ratio of 1:200. The mixed rare earth raw material used for preparing the master alloy is the lanthanum-cerium mixed rare earth after separating Pr and Nd from the cerium-rich mixed rare earth.

[0021] 2. Preparation of high-strength and high-toughness Mg-Al-Mn die-casting magnesium alloy: according to the weight ratio of 97.5% for AM60 ...

example 2

[0025] Example 2 AM60+CeLa (Ce=0.6, La=0.4) die-casting magnesium alloy

[0026] The AM60+CeLa (Ce=0.6, La=0.4) die-casting magnesium alloy is formulated according to the following mass percentages: 95% for the AM60 magnesium alloy, and 5% for the magnesium-lanthanum-cerium master alloy. Its preparation method is as embodiment 1.

[0027] The chemical composition of the obtained alloy is by mass percentage:

[0028] Al

[0029] The high-strength and high-toughness Mg-Al-Mn die-casting magnesium alloy containing cerium-lanthanum mixed rare earth prepared according to the aforementioned process steps, the properties of the alloy are shown in Table 1 and Table 2.

example 3

[0030] Example 3 AM60+CeLa (Ce=0.6, La=0.9) die-casting magnesium alloy

[0031] The AM60+CeLa (Ce=0.6, La=0.9) die-casting magnesium alloy is formulated according to the following mass percentages: 92.5% for the AM60 magnesium alloy and 7.5% for the magnesium-lanthanum-cerium master alloy. Its preparation method is as embodiment 1.

[0032] The chemical composition of the obtained alloy is by mass percentage:

[0033] Al

[0034] The high-strength and high-toughness Mg-Al-Mn die-casting magnesium alloy containing cerium-lanthanum mixed rare earth prepared according to the aforementioned process steps, the properties of the alloy are shown in Table 1 and Table 2.

technical field

[0001] The invention relates to a method for preparing a high-strength and high-toughness Mg-Al-Mn die-casting magnesium alloy containing lanthanum-cerium mixed rare earth, and belongs to the field of metal materials. Background technique

[0002] With the development of the automobile industry, the current application of magnesium alloys has expanded from small parts such as covers to large components and power systems, which puts forward higher requirements for the strength, plasticity and damping performance of magnesium alloys. The Mg-Al-Mn alloy represented by AM60 has been widely used due to its excellent casting process performance, good plasticity, and good shock absorption performance. However, such alloys also have inherent performance shortcomings of low strength and poor corrosion resistance, which limit their further application. In order to solve these shortcomings, rare earth elements are introduced into the alloy system in order to improve it...

Examples

Embodiment 1

[0018] Embodiment 1AM60+CeLa (Ce=0.2, La=0.3) die-casting magnesium alloy

[0019] The preparation method of AM60+CeLa (Ce=0.2, La=0.3) die-casting magnesium alloy is as follows:

[0020] 1. Preparation of magnesium-lanthanum-cerium master alloy: according to the mass ratio of 80% magnesium and 20% mixed rare earth raw materials, the magnesium ingot and mixed rare earth raw materials are put into a cast iron or graphite crucible, heated and melted, and the temperature is raised to 780°C. Stir evenly and cast into a magnesium-lanthanum-cerium master alloy ingot. SF is introduced into the smelting process 6 :CO 2 Protective gas with a volume ratio of 1:200. The mixed rare earth raw material used for preparing the master alloy is the lanthanum-cerium mixed rare earth after separating Pr and Nd from the cerium-rich mixed rare earth.

[0021] 2. Preparation of high-strength and high-toughness Mg-Al-Mn die-casting magnesium alloy: according to the weight ratio of 97.5% for AM60 ...

example 2

[0025] Example 2 AM60+CeLa (Ce=0.6, La=0.4) die-casting magnesium alloy

[0026] The AM60+CeLa (Ce=0.6, La=0.4) die-casting magnesium alloy is formulated according to the following mass percentages: 95% for the AM60 magnesium alloy, and 5% for the magnesium-lanthanum-cerium master alloy. Its preparation method is as embodiment 1.

[0027] The chemical composition of the obtained alloy is by mass percentage:

[0028] Al

[0029] The high-strength and high-toughness Mg-Al-Mn die-casting magnesium alloy containing cerium-lanthanum mixed rare earth prepared according to the aforementioned process steps, the properties of the alloy are shown in Table 1 and Table 2.

example 3

[0030] Example 3 AM60+CeLa (Ce=0.6, La=0.9) die-casting magnesium alloy

[0031] The AM60+CeLa (Ce=0.6, La=0.9) die-casting magnesium alloy is formulated according to the following mass percentages: 92.5% for the AM60 magnesium alloy and 7.5% for the magnesium-lanthanum-cerium master alloy. Its preparation method is as embodiment 1.

[0032] The chemical composition of the obtained alloy is by mass percentage:

[0033] Al

[0034] The high-strength and high-toughness Mg-Al-Mn die-casting magnesium alloy containing cerium-lanthanum mixed rare earth prepared according to the aforementioned process steps, the properties of the alloy are shown in Table 1 and Table 2.

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