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Secondary hot extrusion process of aq80m magnesium alloy sheet

A magnesium alloy, hot extrusion technology, applied in the secondary hot extrusion process of AQ80M magnesium alloy sheet, can solve the problems of poor plastic deformation ability, limited texture strength of materials, and limited application of magnesium alloys.

Active Publication Date: 2020-06-30
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 into boards, and materials are often limited to high temperature boards, so the texture strength is low

Method used

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  • Secondary hot extrusion process of aq80m magnesium alloy sheet
  • Secondary hot extrusion process of aq80m magnesium alloy sheet
  • Secondary hot extrusion process of aq80m magnesium alloy sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, the magnesium alloy semi-continuous casting billet is Φ580mm, the length is 1600mm, and the specification of the extruded plate is 160mm wide, 70mm thick, and the length is ≥5000mm.

[0024] After turning and peeling the above billet, carry out homogenization treatment at 250°C / 10h+410°C / 20h; then heat the extrusion die and extrusion barrel, the temperature of the mold is 380°C, the temperature of the extrusion barrel is 420°C, and then the magnesium alloy The billet is heated to 380°C and kept for 3 hours, then put into the extrusion cylinder, and extruded on a 10000T horizontal hydraulic press to obtain an extruded bar with an extrusion ratio of 3 and an exit speed of 4mm / s; the length after sawing and blanking is 600mm The primary extruded bar is then kept at 380°C for 3 hours, and then secondly extruded in the extrusion cylinder and mold at 380°C, the extrusion ratio is 5, the exit speed is 12mm / s, and the extruded plate is kept at 380°C After co...

Embodiment 2

[0028] In this embodiment, the magnesium alloy semi-continuous casting billet is adopted with a specification of Φ580mm and a length of 1800mm, and the specifications of the extruded plate are 145mm wide, 55mm thick and ≥5000mm long.

[0029] After turning and peeling the above billet, perform a homogenization treatment at 300°C / 15h+400°C / 25h; 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 The billet is heated to 340°C for 1 hour, put into the extrusion cylinder, and extruded on a 10,000T horizontal hydraulic press to obtain an extruded bar with an extrusion ratio of 9 and an exit speed of 1.5mm / s. The 800mm primary extruded bar is then kept at 340°C for 1 hour, then extruded in the extrusion barrel and mold at 360°C, with an extrusion ratio of 8 and an exit speed of 6mm / s. After extrusion, the plate is held at 410°C for 1 hour and then cooled Then carry out ...

Embodiment 3

[0033] In this embodiment, a magnesium alloy semi-continuous casting billet Φ610 mm is used, and the length is 1500 mm. The specifications of the extruded plate are 155 mm wide, 63 mm thick, and ≥5000 mm long.

[0034] After turning and peeling the above billet, perform homogenization treatment at 270°C / 20h+380°C / 30h; then heat the extrusion die and extrusion barrel, the temperature of the mold is 420°C, the temperature of the extrusion barrel is 340°C, and then the magnesium alloy The billet is heated to 420°C for 1 hour, put into the extrusion cylinder, and extruded on a 10000T horizontal hydraulic press to obtain an extruded bar with an extrusion ratio of 6 and an exit speed of 2.5mm / s; The 400mm primary extrusion bar is then kept at 360°C for 2 hours, then extruded in the extrusion cylinder and mold at 340°C, the extrusion ratio is 6, and the exit speed is 4mm / s. After extrusion, the plate is kept at 400°C for 1 hour and then cooled Then perform isothermal aging heat treat...

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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 5:8 and the extrusion speed of 4-12 mm / s to obtain magnesium alloy plates; 4) performing thermal treatment to the magnesium alloy plates obtained in 3) to obtain final products. According to the secondary hot-extrusion technology disclosed by the invention, the plates with the width of 145-160 mm, the thickness of 55-70 mm and the length of at least 5000 mm can be obtained, the high-temperature tensile strength of the magnesium alloy plates is >= 250 MPa, the yield strength is >= 190 MPa, and the elongation is >= 25%.

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 plates. 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 increase...

Claims

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Application Information

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Patent Type & Authority Patents(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