Preparation method of high-toughness magnesium alloy bar

A magnesium alloy and bar technology is applied in the field of preparation of high-strength and tough magnesium alloy bars, which can solve the problems of complex process and mold structure, high cost, inability to meet the mass production of engineering applications, etc., so as to improve the comprehensive mechanical properties, Stable mechanical properties, avoiding the effect of complete growth

Active Publication Date: 2013-11-13
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to existing literature research, deep plastic deformation is beneficial to grain refinement, and rapid solidification powder sheathed extrusion or hot rolling, mechanical alloying powder sheathed extrusion or hot rolling, and equal channel angular extrusion (ECAE ) and other methods can refine the magnesium alloy grains to the submicron level, but the process and mold structure in the preparation method are complicated, and the cost is relatively high, so it cannot meet the needs of mass production for engineering applications

Method used

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  • Preparation method of high-toughness magnesium alloy bar

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Embodiment 1

[0021] A preparation method of a high-strength and toughness magnesium alloy bar, which comprises the following steps:

[0022] (1) The diameter is 300mm, the average grain size is 200μm, the room temperature tensile strength Rm is 280MPa, and the yield strength Rp 0.2 The AZ91D magnesium alloy cast slab with 210MPa and 10% elongation A was subjected to solution treatment at 413°C for 24 hours, that is, kept for 24 hours, so that the second phase Mg formed during the non-equilibrium solidification process of the cast slab 17 Al 12 The compound is completely dissolved in the magnesium matrix;

[0023] (2) The above-mentioned magnesium alloy billet is isothermally extruded using a horizontal extrusion machine equipped with an extrusion sleeve. The maximum extrusion capacity of this equipment is 3600t, and a mixture of molybdenum disulfide and cylinder oil is used as a lubricant Lubricate, which specifically adds molybdenum disulfide accounting for 15% of the total mass fractio...

Embodiment 2

[0029] A preparation method of a high-strength and toughness magnesium alloy bar, which comprises the following steps:

[0030] (1) The diameter is 400mm, the average grain size is 200μm, the room temperature tensile strength Rm is 260MPa, and the yield strength Rp 0.2 The AZ80 magnesium alloy cast slab with 200MPa and 12% elongation A was subjected to solution treatment at 410°C for 24 hours, so that the second phase Mg formed during the non-equilibrium solidification process of the cast slab 17 Al 12 The compound is completely dissolved in the magnesium matrix;

[0031] (2) A horizontal extruder equipped with an extrusion sleeve is used for isothermal extrusion. The maximum extrusion capacity of the selected equipment is 3600t, and a mixture of molybdenum disulfide and cylinder oil is used as a lubricant for lubrication. The specific It is to add molybdenum disulfide with a total mass fraction of 15% to the cylinder oil, stir it evenly and apply it on the surface of the bi...

Embodiment

[0036] A preparation method of a high-strength and toughness magnesium alloy bar, which comprises the following steps:

[0037] (1) The diameter is 340mm, the average grain size is 200μm, the room temperature tensile strength Rm is 250MPa, and the yield strength Rp 0.2 The AZ61D magnesium alloy cast slab with 200MPa and elongation after fracture A12% is subjected to solution treatment at 415°C for 24 hours, so that the second phase Mg formed during non-equilibrium solidification of the cast slab 17 al 12 The compound is completely dissolved in the magnesium matrix;

[0038] (2) Use a horizontal extrusion machine equipped with an extrusion sleeve for isothermal extrusion. The maximum extrusion force of this equipment is 3600t, and a mixture of molybdenum disulfide and cylinder oil is used as a lubricant for lubrication. Specifically, Add molybdenum disulfide with a total mass fraction of 10% to the cylinder oil, stir evenly and apply it on the inner surface of the billet and ...

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Abstract

The invention relates to a preparation method of a high-toughness magnesium alloy bar. The method comprises the following steps: 1, carrying out a solid solution treatment on a magnesium alloy casting blank with diameter of 300-400 mm, so as to completely dissolve a second phase Mg17Al12 formed in a non-equilibrium solidification process into a Mg matrix; 2, employing a routine horizontal extruder according to specifications of bars to be prepared with different diameters, wherein the horizontal extruder is assorted with a corresponding extruding sleeve, has a tonnage of 3600 t, and smearing a lubricant on a casting blank and a surface of the extruding sleeve, and carrying out isothermal extrusion molding. According to the invention, researches on influences of technological parameters including extrusion ratio, extruding temperature and extruding rate on crystal size and mechanical properties of magnesium alloy are conducted, and a two-step extrusion deformation process is employed to prepare the high-performance magnesium alloy material, so as to substantially improve integrated mechanical properties of the magnesium alloy material.

Description

technical field [0001] The invention relates to a processing method for a magnesium alloy material, in particular to a preparation method for a high-strength and toughness magnesium alloy rod. Background technique [0002] Magnesium alloy has the characteristics of light specific gravity, high specific strength, good impact resistance and shock resistance, excellent electromagnetic shielding performance and cutting performance, and is known as a clean metal structural material that can be recycled in the 21st century and does not pollute the environment, especially in It has an irreplaceable advantage in realizing the lightweight of product components / parts. With the development of high-tech weapons and equipment, vehicles, and electronic products in the direction of light weight and high performance, the application prospects of magnesium alloys in aerospace vehicles, weapons and equipment, automobiles, and electronic products will become more and more extensive. Structura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C21D8/06C22C23/02
Inventor 陈强舒大禹赵祖德胡传凯黄树海林军赵志翔万元元
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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