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Preparation method of ultra-fine grain AZ61 magnesium alloy bulk material

A technology of bulk material and magnesium alloy, applied in the field of ultra-fine grain AZ61 magnesium alloy bulk material preparation, can solve the problems of complicated operation process, unsuitable for processing large-sized bulk materials, unsuitable for industrialized production, etc., to ensure plastic forming ability Effect

Inactive Publication Date: 2018-09-14
HUNAN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the existing method has a complicated operation process, is not suitable for industrial production, and is not suitable for processing large-sized bulk materials

Method used

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  • Preparation method of ultra-fine grain AZ61 magnesium alloy bulk material
  • Preparation method of ultra-fine grain AZ61 magnesium alloy bulk material
  • Preparation method of ultra-fine grain AZ61 magnesium alloy bulk material

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Embodiment 1

[0026] The material selected in this embodiment is AZ61 magnesium alloy, the specific composition is Mg-3Al-1Zn, and the length, width and height of the sample before thermal processing are 35 mm, 35 mm and 40 mm, respectively.

[0027] A method for preparing an ultrafine-grained AZ61 magnesium alloy bulk material, comprising the following steps:

[0028] 1) Heat treatment process: put the sample in an iron box and cover it with graphite-containing sand, put it in a heat treatment furnace for heating and heat preservation, set the heating temperature to 400°C, and keep it warm for 10 hours after reaching the set temperature, so that the continuous network distribution The second phase of the alloy basically dissolves into the matrix, and the sample is taken out and air-cooled, so that the second phase does not have time to precipitate, and a single-phase solid solution with basically uniform properties is obtained. The microstructure of the alloy before and after heat treatment...

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Abstract

A preparation method of an ultra-fine grain AZ61 magnesium alloy bulk material comprises thermal treating and thermal processing of the alloy, wherein the temperature in the thermal treating of the alloy is maintained at 400+ / -5 DEG C, and the temperature is maintained for 10+ / -0.5 hours; the alloy is cooled by air; the temperature in the thermal processing of the alloy is 250+ / -5 DEG C, and the temperature is maintained for 10+ / -1min before thermal processing; the thermal processing mode is a small-pass-straining high-strain-rate three-way forging mode; a pneumatic hammer is used as a forgingdevice; passes are heated without repeating, and the pass strain capacity is 10+ / -0.5%; 12 deformation passes are provided; and the cooling mode is realized by air cooling. According to the method, asimilar solid solution structure is obtained by high-temperature short-time thermal treating; a large number of twin crystals can be produced by high-speed deformation and are induced to dynamicallyrecrystallized, and thus the alloy structure can be rapidly refined; and meanwhile, the temperature decrease caused by heat dissipating is compensated by temperature increase effect of high-speed deformation, and passes are not heated. The method is suitably used for preparing the ultra-fine grain AZ61 magnesium alloy bulk material.

Description

technical field [0001] The invention relates to a method for preparing an AZ61 magnesium alloy, in particular to a method for preparing an ultrafine-grained AZ61 magnesium alloy bulk material. Background technique [0002] Magnesium alloy is the lightest metal structure material with high specific strength, high specific stiffness, good vibration damping ability, excellent thermal conductivity and electrical conductivity, good dimensional stability, electromagnetic shielding and easy recycling. In recent years, with the increasingly prominent energy and environmental issues, magnesium alloys have rapidly emerged as new engineering materials, and have gradually become ideal substitutes for engineering materials such as aluminum alloys, steel, and engineering plastics. Electrical appliances and other fields have important application value and broad application prospects. [0003] However, the low strength of magnesium alloys and the lag in the development of high-strength ma...

Claims

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Application Information

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IPC IPC(8): C22F1/06B21J1/06B21J5/00
CPCC22F1/06B21J1/06B21J5/00
Inventor 吴远志李庆芬刘伟邓彬叶拓周小桃
Owner HUNAN INST OF TECH
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