Extrusion method for SiC particle enhanced AZ91D magnesium-based composite material tubular product
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A technology of particle reinforcement and extrusion method, applied in the direction of metal extrusion dies, etc., can solve the problem of cracking and other problems of SiC particle reinforced magnesium matrix composites
Active Publication Date: 2020-10-27
NORTHEAST LIGHT ALLOY CO LTD
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[0004] The present invention aims to solve the technical problem that SiC particle-reinforced magnesium-based composite material is prone to cracking during extrusion, and provides an extrusion method for SiC particle-reinforced AZ91D magnesium-based composite material pipe
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specific Embodiment approach 1
[0025] Embodiment 1: In this embodiment, a SiC particle-reinforced AZ91D magnesium-based composite material pipe extrusion method is specifically carried out in the following steps:
[0026] 1. Heat the SiC / AZ91D magnesium-based ingot to 350-400°C, keep it warm for 4-5 hours, turn the temperature to 400-450°C, keep it warm for 25-30 hours, and cool it out of the furnace in air;
[0027] 2. Turning the air-cooled SiC / AZ91D magnesium-based ingot to obtain the SiC / AZ91D magnesium-based ring billet;
[0028] 3. Heat the SiC / AZ91D magnesium-based ring blank to 380-420°C, keep it warm for 5-8 hours, and then extrude the SiC / AZ91D magnesium-based ring blank by magnesium-coated extrusion to obtain prefabricated pipes;
[0029] 4. Solid solution treat the prefabricated pipe at a temperature of 370-390°C for 1-3 hours, then raise the temperature to 400-420°C, keep it warm for 20-22 hours, and cool it in air; then, at a temperature of 160-180°C, aging After treatment for 30-35 hours, a ...
specific Embodiment approach 2
[0033] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the SiC / AZ91D magnesium-based ingot described in step 1 is cast by a semi-solid stirring method, and the specific casting process is as follows: the AZ91D magnesium alloy is heated to 700~750℃, add SiC particles, then cool down to 580~595℃, stir, control the stirring speed to 800~1000r / min, and stir for 30~40min; then raise the temperature to 730~750℃, control the stirring speed to 200 ~300r / min, stirring for 15~25min to obtain a melt, inject the melt into a mold for casting and molding, and obtain a SiC / AZ91D magnesium-based ingot. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0034] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the composition of the AZ91D magnesium alloy is: 8.3%≤Al≤9.7%, 0.35%≤Zn≤1.0%, 0.15%≤ Mn≤0.5%, the balance is Mg. Others are the same as in the first or second embodiment.
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Abstract
The invention relates to an extrusion method for a SiC particle enhanced AZ91D magnesium-based composite material tubular product and relates to the technical field of metal-based composite material processing. The extrusion method is to solve the technical problem that the SiC particle enhanced magnesium-based composite material which is extruded is easily cracked. The method comprises the following steps of S1, heating a SiC / AZ91D magnesium-based cast ingot; S2, turning; S3, extruding a SiC / AZ91D magnesium-based ring ingot by way of magnesium-coating extrusion; and S4, solid solution and ageing. The method comprises the step of extruding the SiC / AZ91D magnesium-based ring ingot by way of magnesium-coating extrusion. In the magnesium-coating extrusion process, the SiC / AZ91D magnesium-based ingot blank is free of a cracking phenomenon to obtain the SiC particle enhanced AZ91D magnesium-based composite material tubular product which has the characteristics of being low in density, highin specific strength and specific stiffness, good in isotropism in physical property, good in damping shock absorbing property, excellent in electromagnetic shielding effect and the like. The method provided by the invention is used for obtaining the SiC particle enhanced AZ91D magnesium-based composite material tubular product.
Description
technical field [0001] The invention relates to the technical field of metal matrix composite material processing. Background technique [0002] The density of magnesium and its alloys is 1.6-1.85g / cm 3 It is about 1 / 4 of the density of traditional steel, which is 61% lighter than titanium alloy and about 67% lighter than aluminum alloy. It is one of the lightest metal structural materials at present, with low density, specific strength and It has the advantages of high specific stiffness, good thermal conductivity, good damping and shock absorption, good electromagnetic shielding effect, stable size of parts and easy recycling. The application in engineering can greatly reduce the quality of structural parts, and then become a structural functional material in lightweight engineering, which can effectively reduce energy consumption. At the same time, magnesium alloy is suitable for transportation equipment, aerospace equipment, military industry and other fields, and is k...
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