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Secondary hot-extrusion technology of AQ80M magnesium alloy profiles

A magnesium alloy and hot extrusion technology, which is applied in the field of secondary hot extrusion of AQ80M magnesium alloy profiles, can solve problems such as limiting the application of magnesium alloys, poor plastic deformation ability, and limited texture strength of materials

Inactive Publication Date: 2017-09-19
HUNAN JINGE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Magnesium has a close-packed hexagonal crystal structure, insufficient movable slip systems at room temperature and low temperature, and poor plastic deformation ability, which severely limits the application of magnesium alloys.
Traditional extrusion is one-time extrusion molding, and the material is often limited by high temperature molding, so the texture strength is low

Method used

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  • Secondary hot-extrusion technology of AQ80M magnesium alloy profiles
  • Secondary hot-extrusion technology of AQ80M magnesium alloy profiles
  • Secondary hot-extrusion technology of AQ80M magnesium alloy profiles

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In this example, the ingot is melted by a large-capacity furnace, cast semi-continuously, and turned and peeled to obtain an ingot with a specification of Φ580mm and a length of 1500mm. Chemical treatment; then heat the extrusion die and extrusion barrel, the mold temperature is 380°C, the extrusion barrel temperature is 420°C, and then the magnesium alloy billet is heated to 380°C and kept for 3 hours, then put into the extrusion barrel, and the 10000T horizontal hydraulic press Extrude on the top to obtain a primary extruded bar, the extrusion ratio is 2, and the exit speed is 6mm / s; the primary extruded bar with a length of 600mm after sawing and blanking is kept at 380°C for 3h, and extruded at 380°C The secondary extrusion is carried out inside the cylinder and the mold, the extrusion ratio is 12, the exit speed is 12mm / s, the diameter of the circumscribed circle of the triangular profile after extrusion is 108mm, and the length is ≥5000mm. After extrusion, the prof...

Embodiment 2

[0027] In this embodiment, the ingot is melted by a large-capacity furnace, and after semi-continuous casting, the ingot size is Φ570 mm and the length is 1500 mm after turning and peeling. Homogenization treatment; then heat the extrusion die and extrusion barrel, the temperature of the mold is 340°C, the temperature of the extrusion barrel is 380°C, and then the magnesium alloy billet is heated to 340°C for 1 hour and then put into the extrusion barrel. Extrude on a hydraulic press to obtain a primary extruded bar with an extrusion ratio of 9 and an exit speed of 1.5 mm / s. The primary extruded bar with a length of 800 mm after sawing and blanking is kept at 340°C for 1 hour, and then heated at 360°C. Extrusion inside the extrusion barrel and mold, extrusion ratio 15, exit speed 4mm / s, extruded triangular profile circumscribed circle diameter 95mm, length ≥ 5000mm, extruded profile kept at 410°C for 1 hour, then cooled at 200°C After isothermal aging heat treatment for 20 h, ...

Embodiment 3

[0031] In this example, the ingot is melted by a large-capacity furnace, and after semi-continuous casting, the ingot size is Φ580 mm and the length is 1500 mm after turning and peeling. Homogenization treatment; then heat the extrusion die and extrusion cylinder, the temperature of the mold is 420°C, the temperature of the extrusion cylinder is 340°C, and then the magnesium alloy billet is heated to 420°C for 1 hour and then put into the extrusion cylinder. Extruded on a hydraulic press to obtain a primary extruded bar, the extrusion ratio is 6, and the exit speed is 3mm / s; the primary extruded bar with a length of 400mm after sawing and blanking is kept at 360°C for 2h, and extruded at 340°C Extrude inside the cylinder and the mold, the extrusion ratio is 14, the exit speed is 4mm / s, the diameter of the circumscribed circle of the triangular profile after extrusion is 105mm, and the length is ≥5000mm. After the isothermal aging heat treatment for 40h, the mechanical properti...

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Abstract

The invention discloses a secondary hot-extrusion technology of AQ80M magnesium alloy profiles. The secondary hot-extrusion technology comprises the steps: 1) performing double-stage homogenizing treatment to magnesium alloy billets after peeling; 2) heating the magnesium alloy billets to 340-420 DEG C after double-stage homogenizing pretreatment, holding the magnesium alloy billets for 1-3 h at 340-420 DEG C, performing primary hot-extrusion deformation at the extrusion ratio of 2:9 and the extrusion speed of 1.5-6 mm / s to obtain bars; 3) heating the magnesium alloy bars obtained in 3) to 340-380 DEG C, holding the magnesium alloy bars for 1-3 h at 340-380 DEG C, performing secondary hot-extrusion deformation at the extrusion ratio of 12:15 and the extrusion speed of 4-12 mm / s to obtain magnesium alloy triangular profiles; 4) performing thermal treatment to the magnesium alloy triangular profiles obtained in 3) to obtain final products. According to the secondary hot-extrusion technology disclosed by the invention, the triangular profiles with the circumscribed circle diameter of 95-108 mm and the length of at least 5000 mm can be obtained, the high-temperature tensile strength of the magnesium alloy triangular profiles after thermal treatment is >= 250 MPa, the yield strength is >= 195 MPa, and the elongation is >= 23%.

Description

technical field [0001] The invention relates to the field of extrusion deformation processing of magnesium alloys, in particular to a secondary hot extrusion process for AQ80M magnesium alloy profiles. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, good thermal conductivity, strong shock absorption capacity, easy cutting, recyclability and stable size. As a structural material, it is extremely important in the fields of automobiles, electronic communications, aerospace and national defense. Application value and broad application prospects. [0003] Compared with Mg-RE magnesium alloys, the cost of Mg-Al alloys is low, and at the same time, the plasticity of this alloy is better than that of most Mg-RE alloys. However, since the melting point of the main precipitated phase is 437°C, the heat resistance is poor. After adding elements such as Ag and RE, the volume fraction of the precipitated phase in the alloy increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22F1/06
CPCC22C23/02C22F1/06
Inventor 邹利民邹若之邹胜民李卓
Owner HUNAN JINGE NEW MATERIAL
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