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A method for preparing fine-grained magnesium alloy by alternate reverse extrusion

A magnesium alloy, reverse extrusion technology, applied in the field of magnesium alloy processing, achieves the effects of simple equipment, expanded application scope, and easy operation

Inactive Publication Date: 2018-02-16
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned shortcomings that the existing fine-grained magnesium alloy blocks are difficult to prepare, the present invention provides a method for preparing fine-grained magnesium alloys by alternate back extrusion, which is a special forming method for preparing fine-grained magnesium alloys by alternate back extrusion: Using ordinary extrusion punches and dies, the magnesium alloy undergoes multiple severe plastic deformations through alternate back-extrusion processes to refine the grains of the magnesium alloy. Back pressure keeps the deformed body in a strong three-dimensional compressive stress state, preventing cracks; improving the plastic deformation capacity of magnesium alloys

Method used

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  • A method for preparing fine-grained magnesium alloy by alternate reverse extrusion
  • A method for preparing fine-grained magnesium alloy by alternate reverse extrusion
  • A method for preparing fine-grained magnesium alloy by alternate reverse extrusion

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Embodiment 1

[0033] A method for preparing a fine-grained magnesium alloy by alternate back extrusion, comprising the steps of:

[0034] Step 1, cutting:

[0035] Cutting the extruded AZ31 magnesium alloy rod into a magnesium alloy cylindrical rod, wherein the outer diameter of the magnesium alloy cylindrical rod is 80 mm, and the height of the cylindrical rod is 30 mm;

[0036] Step 2, bar heat treatment:

[0037] Put the magnesium alloy cylindrical rod into the heating furnace, heat it to the extrusion opening temperature of 350°C at a heating rate of 10°C / s, and keep it warm for 60min;

[0038] Step 3, mold preheating:

[0039] Put the central punch, hollow punch and die into the mold heater and preheat to 200°C; the outer diameter of the central punch is 40mm, the inner diameter of the hollow punch is 30mm, and the outer diameter of the hollow punch is 80mm , the inner diameter of the die is 80mm, and the depth of the die is 100mm;

[0040] Step 4, Alternate back extrusion:

[004...

Embodiment 2

[0050] A method for preparing a fine-grained magnesium alloy by alternate back extrusion, comprising the steps of:

[0051] Step 1, cutting:

[0052] Cut the cast magnesium alloy rods into magnesium alloy cylindrical rods;

[0053] Step 2, bar heat treatment:

[0054] Put the magnesium alloy cylindrical rod into the heating furnace, heat it to the extrusion opening temperature of 380°C at a heating rate of 15°C / s, and keep it warm for 60min;

[0055] Step 3, mold preheating:

[0056] Put the central punch, hollow punch and die into the mold heater, and preheat to 230°C; wherein, the outer diameter of the magnesium alloy cylindrical rod is 80mm, the height of the cylindrical rod is 30mm, and the central convex The outer diameter of the mold is 40mm, the inner diameter of the hollow punch is 30mm, the outer diameter of the hollow punch is 80mm, the inner diameter of the die is 80mm, and the depth of the die is 100mm;

[0057] Step 4, Alternate back extrusion:

[0058] (1) T...

Embodiment 3

[0066] A method for preparing a fine-grained magnesium alloy by alternate back extrusion, comprising the steps of:

[0067] Step 1, cutting:

[0068] The cast magnesium alloy bar is cut into a magnesium alloy cylindrical rod; wherein, the outer diameter of the magnesium alloy cylindrical rod is 80mm, and the height of the cylindrical rod is 30mm.

[0069] Step 2, bar heat treatment:

[0070] Put the magnesium alloy cylindrical rod into the heating furnace, heat it to the extrusion opening temperature of 300°C at a heating rate of 10°C / s, and keep it for 90min;

[0071] Step 3, mold preheating:

[0072] Put the central punch, hollow punch and die into the mold heater and preheat to 180°C; the outer diameter of the central punch is 40mm, the inner diameter of the hollow punch is 30mm, and the outer diameter of the hollow punch is 80mm, the inner diameter of the die is 80mm, and the depth of the die is 100mm;

[0073] Step 4, Alternate back extrusion:

[0074] (1) The first ...

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Abstract

A method for preparing fine-grained magnesium alloy by alternating reverse extrusion, belonging to the field of magnesium alloy processing technology. Method: 1) Cut the magnesium alloy cylindrical rod; 2) Heat treatment of the bar material; 3) Preheat the mold; 4) Alternate reverse extrusion: Perform 3 to 6 passes of reverse extrusion on the magnesium alloy cylindrical rod. Magnesium alloy deformed parts are produced; the operation sequence of each pass of reverse extrusion is the same; between every two passes of reverse extrusion, the billet is reheated, and the billet is turned over for the next pass of reverse extrusion; among them, the first reverse extrusion Extrusion, place the magnesium alloy cylindrical rod at the bottom of the die, the center punch goes down and then is unloaded, and then the hollow punch goes down; 5) Final pass forging: the center punch and the hollow punch are extruded down at the same time to obtain fine Crystalline magnesium alloy. The method of the present invention prepares fine-grained magnesium alloy materials with significantly improved strength and plasticity and an average grain size of less than 10 μm through alternating reverse extrusion; the equipment is simple, low cost, high efficiency, easy to operate, and industrialized in sight.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy processing, and in particular relates to a method for preparing fine-grained magnesium alloy by alternate reverse extrusion. Background technique [0002] As an advanced lightweight metal structure material, magnesium alloy has high specific strength and good impact resistance, which can meet the lightweight requirements of aerospace, automobiles and electronic products, and reduce energy consumption and environmental pollution. One of the fastest growing materials for industrial applications. However, the close-packed hexagonal lattice structure determines the poor plastic deformation ability of magnesium alloy at room temperature, which greatly limits its application range. Grain refinement can not only effectively improve the room temperature plasticity of magnesium alloy, but also significantly improve its corrosion resistance and fatigue. performance. The use of solid-state deformat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 梅瑞斌包立李飘飘闫鹏飞张欣黄明丽张朕马家兵
Owner NORTHEASTERN UNIV LIAONING
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