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A kind of high thermal conductivity and high strength mg-al-la-mn wrought magnesium alloy and preparation method thereof

A deformed magnesium alloy, high thermal conductivity technology, applied in the field of magnesium alloy and its preparation, to achieve high strength, meet heat dissipation performance requirements, and good overall performance

Active Publication Date: 2022-03-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the strength and thermal conductivity of magnesium alloys are in an inverted relationship, the present invention provides a high thermal conductivity and high strength Mg-Al-La-Mn deformed magnesium alloy and a preparation method thereof

Method used

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  • A kind of high thermal conductivity and high strength mg-al-la-mn wrought magnesium alloy and preparation method thereof
  • A kind of high thermal conductivity and high strength mg-al-la-mn wrought magnesium alloy and preparation method thereof
  • A kind of high thermal conductivity and high strength mg-al-la-mn wrought magnesium alloy and preparation method thereof

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specific Embodiment approach 1

[0028] Specific implementation mode 1: The elements and contents in the high thermal conductivity and high strength Mg-Al-La-Mn deformed magnesium alloy in this embodiment are: Al: 2.8-3.5wt.%, La: 4.3-5.0wt.%, Mn: 0.28- 0.3wt.%, Mg is the balance. The alloy also contains some unavoidable impurities such as Fe and Si.

[0029] This embodiment has the following beneficial effects:

[0030] The room temperature thermal conductivity of the high thermal conductivity and high strength Mg-Al-La-Mn alloy extruded alloy of this embodiment is 112-120W / (m K), the yield strength is 245-271MPa, and the tensile strength is 318-335MPa , the elongation rate is 10%-21%. The alloy has both high thermal conductivity and high strength, and has good comprehensive performance. It can effectively meet the heat dissipation performance requirements of components such as communication equipment and electronic products. It has broad application prospects in the fields of aerospace, automobile, electr...

specific Embodiment approach 2

[0032] Specific embodiment two: The preparation method of the high thermal conductivity and high strength Mg-Al-La-Mn deformed magnesium alloy of this embodiment is carried out according to the following steps:

[0033] 1. Raw material preparation:

[0034] According to the mass percentage of elements, Al: 2.8-3.5wt.%, La: 4.3-5.0wt.%, Mn: 0.28-0.3wt.%, and the rest is Mg. Weigh Mg-Al master alloy and Mg-La master alloy , Mg-Mn master alloy and pure Mg ingot are used as raw materials to remove oxide skin and inclusions on the surface of pure Mg ingot and master alloy;

[0035] 2. Preheating: Preheat the raw materials weighed in step 1 to 200-250°C;

[0036] 3. Melting:

[0037] ①. Put the crucible into a resistance heating furnace, set the temperature of the heating furnace to 750-760°C, when the temperature of the crucible reaches 600°C-650°C, feed SF 6 and CO 2Mix the protective gas, and put the pure Mg ingot obtained in step 2 into the crucible for smelting. After 30-45...

specific Embodiment approach 3

[0047] Specific embodiment three: the difference between this embodiment and the second embodiment is that in step one, the mass percentage of elements is Al: 2.8wt.%, La: 5.0wt.%, Mn: 0.3wt.%, and the rest is Mg, which is called Take the ingredients.

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Abstract

A high thermal conductivity and high strength Mg-Al-La-Mn deformed magnesium alloy and a preparation method thereof, relating to a magnesium alloy and a preparation method thereof. In order to solve the problem that the strength and thermal conductivity of magnesium alloys are inversely related. Elements and content are: Al: 2.8-3.5wt.%, La: 4.3-5.0wt.%, Mn: 0.28-0.3wt.%, and Mg is the balance. Method: Raw materials are prepared and preheated, and pure Mg ingot, Mg-La master alloy, Mg-Mn master alloy and Mg-Al master alloy are smelted in sequence, and the crucible is water-cooled and demoulded to obtain magnesium alloy ingot; the magnesium alloy ingot is removed Oxidize the part and turn it to get the as-cast billet, extrusion deformation. The present invention also improves the plasticity of the alloy because most of the grains of the alloy after extrusion are uniform and fine, and the second phase is diffusely distributed. The invention is suitable for preparing magnesium alloy.

Description

technical field [0001] The invention relates to a magnesium alloy and a preparation method thereof. Background technique [0002] As the lightest metal structure material, magnesium alloy has a density of 1 / 4 of steel and 2 / 3 of aluminum, with high specific strength, specific stiffness, good casting performance, cutting performance, electromagnetic shielding performance and other advantages, and Environmentally friendly and easy to recycle, it is known as "green engineering material in the 21st century" and has broad application prospects in aerospace, national defense, automobile, 3C products and other fields. [0003] With the rapid development of modern industry, heat dissipation materials in aerospace, automobile, 3C products and other fields not only require good thermal conductivity, but also must have performance characteristics such as light weight and high strength, so the development and preparation of excellent thermal conductivity and mechanical properties The p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03B22D7/00B21C23/20
CPCC22C23/06C22C1/03B22D7/005B21C23/20
Inventor 徐超刘华锋左静胡小石王晓军范国华耿林赵德利郭伟
Owner HARBIN INST OF TECH
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