Efficiently-extrudable low-cost high-performance heat-conducting magnesium alloy and preparation method thereof

A low-cost technology for magnesium alloys, applied in the field of heat-conducting alloys and their preparation, can solve the problems of high production costs of magnesium alloys, high alloy costs, and low extrusion speeds, and achieve high-efficiency production and processing performance, excellent mechanical properties, and stress distribution uniform effect

Active Publication Date: 2014-09-10
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, among Mg-Al-Zn alloys with low thermal conductivity, alloys with low Al content (such as AZ21, AZ31, etc.) can obtain a larger extrusion exit speed (≤20m/min), but after extrusion The room temperature tensile yield strength of the material is generally all lower than 150MPa (Japan Light Metal, 54pp.472-477 (2004), Chinese Patent Publication No. CN101805866B); although alloys with high Al content (such as AZ80, etc.) can obtain higher room temperature tensile Tensile yield strength (>200MPa), but its maximum extrusion exit speed is generally lower than 2m/min (Japan Light Metal, 54pp.472-477 (2004)), low production efficiency leads to high production cost of this series of magnesium alloys
Although patent CN101805866B discloses a kind of alloy that can carry out extruding speed to reach 15m/min, but this alloy contains noble metal Sr and rare earth element Ce, Y, and alloy cost is higher; , density 2.7g/cm 3 ) and Sb (antimony, density 6.7g/cm 3 ) elemen

Method used

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  • Efficiently-extrudable low-cost high-performance heat-conducting magnesium alloy and preparation method thereof
  • Efficiently-extrudable low-cost high-performance heat-conducting magnesium alloy and preparation method thereof
  • Efficiently-extrudable low-cost high-performance heat-conducting magnesium alloy and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0063] Example 1

[0064] 1) A low-cost high-performance heat-conducting magnesium alloy that can be extruded efficiently, and its chemical composition content is: 0.41wt% Al, 0.20wt% Ca, 0.12wt% Mn, 0.10wt% La, and the rest is Mg (referred to as: Mg -0.41Al-0.20Ca-0.12Mn-0.10La); with pure Mg ingot, pure Al ingot, pure Ca particles and Mg-1.3Mn (that is, the composition content of the master alloy is: 1.3wt% Mn, the rest is Mg) and Mg-20La (that is, the composition content of the master alloy is: 20wt% La, and the rest is Mg) the master alloy is used as a raw material, and the ingredients are prepared according to the weight percentage of the above-mentioned magnesium alloy composition;

[0065] 2) After cleaning and preheating the crucible, put all the pure magnesium ingots and Mg-1.3Mn master alloy into the crucible of the smelting furnace. 2 and SF 6 Heating under the protection of mixed protective gas, the heating rate is 20~30℃ / min, CO 2 and SF 6 The flow ratio is 50...

Example Embodiment

[0072] Example 2

[0073] 1) The designed magnesium alloy composition content is: 0.30wt% Al, 0.26wt% Ca, 0.11wt% Mn, 0.12wt% La, and the rest is Mg (referred to as: Mg-0.30Al-0.26Ca-0.11Mn-0.12La );

[0074] 2) smelting process is identical with embodiment 1;

[0075] 3) Casting into magnesium alloy ingots by semi-continuous casting;

[0076] 4) heating the magnesium alloy ingot prepared above to 495°C under the protection of argon atmosphere for 24 hours of homogenization treatment, and then cutting the homogenized magnesium alloy ingot into corresponding extrusion billets;

[0077] 5) Put the billet into the induction heating furnace and quickly heat it to the extrusion deformation temperature of 350°C within 5 minutes;

[0078] 6) Then put it into the extrusion cylinder and adopt the high-efficiency hot extrusion process to deform the billet and process it into a shaped material, the extrusion outlet speed is 25m / min, and the extrusion ratio is 25;

[0079] 7) After ex...

Example Embodiment

[0081] Example 3

[0082] The magnesium alloy composition content and smelting process of design are identical with embodiment 1;

[0083] 1) Casting into a magnesium alloy ingot by metal mold casting;

[0084] 2) heating the magnesium alloy ingot prepared above to 495°C under the protection of argon atmosphere for 24 hours of homogenization treatment, and then cutting the homogenized magnesium alloy ingot into corresponding extrusion billets;

[0085] 3) Put the billet into the induction heating furnace and quickly heat it to the extrusion deformation temperature of 420°C within 8 minutes;

[0086] 4) Then put it into the extrusion cylinder and adopt the high-efficiency hot extrusion process to deform the billet and process it into a profile, the extrusion outlet speed is 60m / min, and the extrusion ratio is 25;

[0087] 5) After extrusion, the profile is cooled by air cooling for subsequent treatment.

[0088] In this example, melting and surface cracking did not occur dur...

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Abstract

The invention discloses an efficiently-extrudable low-cost high-performance heat-conducting magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following chemical components by weight percent: 0.1%-0.8wt% of Al, 0.1%-0.6wt% of Ca, 0.1%-0.6wt% of Mn, 0.05%-0.4wt% of La and the balance of Mg and inevitable impurities. The density of the magnesium alloy is less than 1.78g/cm<3>, quick extrusion production at highest extrusion outlet speed of not less than 20m/min can be carried out, the room-temperature heat-conducting coefficients of final extrusion products are all more than 125W/(m*K), and the magnesium alloy is excellent in comprehensive mechanical property and can be applied to aerospace, computer, communication and consumer electronics, heat dissipation system structure materials of LED illumination products and structural member materials of medical, welfare and outdoor sports equipment.

Description

technical field [0001] The invention relates to a heat-conducting alloy and a preparation method thereof, in particular to a high-efficiency extrusion low-cost high-performance heat-conducting magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium is the lightest of commonly used metal structural materials, with a specific gravity of about 1.74g / cm 3 , is 1 / 4 of steel and 2 / 3 of aluminum. Magnesium and magnesium alloys have the three advantages of rich resources, energy saving, and environmental friendliness, and are lightweight structural materials and functional materials with high specific strength. They are recognized by the world as "the most promising new materials in the 21st century" ". [0003] The thermal conductivity of pure magnesium at room temperature is high, about 157W / m*K, but the strength is too low, and the tensile yield strength in the cast state is about 21MPa. After pure magnesium is alloyed, its strength is signifi...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C23/02C22C23/06C22F1/06
Inventor 徐世伟唐伟能秦云蒋浩民张丕军
Owner BAOSHAN IRON & STEEL CO LTD
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