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On-line quenching and heat treatment method for nano-carbon reinforced aluminum alloy composite extruded profiles
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A heat treatment method and technology for extruding profiles, applied in the field of metal matrix composite materials, can solve the problems of high equipment cost, long high temperature time, long product delivery cycle, etc., to reduce the production equipment cost, avoid secondary high temperature heating, shorten the product The effect of the delivery cycle
Active Publication Date: 2022-03-04
SHANGHAI JIAOTONG UNIV +1
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[0004] Although the above-mentioned method can prepare nano-carbon reinforced aluminum alloy composite materials, the profile extrusion and heat treatment processes are carried out independently, which has the following disadvantages: 1) the high temperature time that the material repeatedly experiences in the extrusion and heat treatment process is relatively long; 2) heat treatment A large-sized special heat treatment furnace that can accommodate extruded profiles is required, and the equipment cost is high; 3) Heat treatment requires additional heating and holding time, and the product delivery cycle is long
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Embodiment 1
[0044] The composite material is CNT / Al-Cu-Mg, wherein the mass fraction of carbon nanotube is 1.5%, the mass fraction of Cu is 4%, and the mass fraction of Mg is 1.5%.
[0045] The specific extrusion and online quenching heat treatment steps are as follows:
[0046]The ingot is prepared by a conventional method, specifically: pure aluminum powder, 4wt.% Cu powder, 1.5wt.% Mg powder and 1.5wt.% CNT are mixed in a mixer for 5 hours, and then put into a ball mill, and the stainless steel The ball is used as the ball milling medium, 1wt.% stearic acid is added as a process control agent, the ball-to-material ratio is 20:1, ball milled at a speed of 135 rpm for 8 hours, and then ball milled at a speed of 270 rpm for 1 hour, after ball milling The composite powder was pressed into a green body with a diameter of 40 mm under a pressure of 500 MPa, and then the green body was sintered in a vacuum sintering furnace at a temperature of 570 ° C for 2 h to obtain an ingot.
[0047] Heat...
Embodiment 2
[0052] The composite material is graphene / Al-Zn-Cu-Mg, wherein the mass fraction of graphene is 0.5%, the mass fraction of Zn is 5%, the mass fraction of Cu is 2%, and the mass fraction of Mg is 2%.
[0053] Adopt conventional method to prepare billet, specifically: pure aluminum powder and 5wt.% Zn powder, 2wt.% Cu powder, 2wt.% Mg powder and 0.5wt.% graphene are mixed 5h in the mixer, then put Put it into a ball mill, use stainless steel balls as the ball milling medium, add 1wt.% stearic acid as a process control agent, the ball-to-material ratio is 20:1, ball mill at a speed of 135 rpm for 6 hours, and then at a speed of 270 rpm After ball milling for 1 hour, the milled composite powder was pressed into a green body with a diameter of 40 mm under a pressure of 500 MPa, and then the green body was sintered in a vacuum sintering furnace at a temperature of 540° C. for 2 hours to obtain an ingot.
[0054] The specific extrusion and online quenching heat treatment steps are as...
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Abstract
The invention discloses an online quenching heat treatment method for an extruded profile of a nano-carbon reinforced aluminum alloy composite material, which comprises the steps of sequentially completing on-line temperature monitoring, solid solution treatment, Quenching treatment, aging treatment. Monitor the profile surface temperature online through the extrusion end of the extruded profile. If the surface temperature of the extruded profile is lower than the solid solution temperature, heat the temperature to the solid solution temperature through the in-situ induction heating system, and keep it warm for a long enough time to complete the solid solution; Put the extruded profiles after solid solution into the water tank for quenching treatment; finally, perform off-line artificial or natural aging on the quenched extruded profiles. This method completes the forming process of the extruded profile, solid solution, and quenching heat treatment sequentially online, avoiding the secondary high-temperature heating of the extruded profile, saving the large-size solid solution furnace, and shortening the product delivery cycle at the same time. Engineering practical value.
Description
technical field [0001] The invention belongs to the technical field of metal-based composite materials, and relates to an on-line quenching heat treatment method for extruded profiles of composite materials, in particular to an on-line quenching heat treatment method for extruded profiles of nano-carbon reinforced aluminum alloy composite materials. Background technique [0002] Nano-carbon reinforced aluminum alloy composite materials such as carbon nanotubes and graphene have the characteristics of high strength and toughness, high modulus, heat resistance and wear resistance, damping and vibration reduction, etc. The comprehensive mechanical properties are better than conventional high-strength aluminum alloys, and maintain the same Mechanical and plastic deformation processability, has a wide range of structural lightweight application prospects in many high-tech fields such as transportation, aerospace, military and national defense. [0003] However, the interfacial re...
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