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Short-process preparation method of ultra-fine grain Mg-3Al-1Zn alloy

An ultra-fine-grained, short-flow technology, used in metal processing equipment, manufacturing tools, casting and molding equipment, etc., can solve problems such as unsuitable processing of large-sized bulk materials, complex operating procedures, and unsuitable industrial production.

Inactive Publication Date: 2018-10-12
HUNAN INST OF TECH
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  • Abstract
  • Description
  • 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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  • Short-process preparation method of ultra-fine grain Mg-3Al-1Zn alloy
  • Short-process preparation method of ultra-fine grain Mg-3Al-1Zn alloy
  • Short-process preparation method of ultra-fine grain Mg-3Al-1Zn alloy

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Embodiment 1

[0025] The material selected in this embodiment 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.

[0026] A short process preparation method of ultrafine-grained Mg-3Al-1Zn alloy, comprising the following steps:

[0027] 1) Casting process: Prepare Mg-3Al-1Zn alloy melt according to the magnesium alloy smelting method, slowly pour the melt into a square water-cooled copper mold, the size of the copper mold is 150mm*150mm*150mm, the mold cooling water capacity is 300ml, cooling The water flow rate is 3 liters per minute. During the pouring process, sulfur powder is sprinkled to prevent burning, and the ingot is taken out after cooling; under the action of the water-cooled copper mold, the solidification structure of the alloy is relatively uniform equiaxed crystals, and there are no coarse grains near the grain boundaries. The second phase basically obtains a single-phase solid solution structure,...

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Abstract

A short-process preparation method of an ultra-fine grain Mg-3Al-1Zn alloy comprises the steps of alloy casting and hot processing. A square water cooling copper mold is adopted as an alloy casting mold, the molding size of the mold is 150mm*150mm*150mm, the capacity of mold cooling water is 300+ / -10 ml, and the flow speed of the cooling water is 3+ / -0.5 L / min; and the alloy hot processing temperature is 250+ / -5 DEG C, the soaking time before hot processing is 10+ / -1 min, the hot processing manner is small-pass-strain high-strain-rate triaxial forging, an air hammer is adopted as forging equipment, heating is not repeated between passes, the pass strain capacity is 10+ / -0.5%, strain passes are 12 passes, and air cooling is adopted as the cooling manner. According to the method, uniform andequiaxial casting structures similar to solid solutions are prepared through the water cooling copper mold, a large number of twin crystals are generated through high-speed deformation, dynamic recrystallization is induced through the twin crystals, and the alloy structure is refined fast; and the method is suitable for preparing ultra-fine grain Mg-3Al-1Zn alloy bulk materials.

Description

technical field [0001] The invention relates to a preparation method of a Mg-3Al-1Zn alloy, in particular to a short-flow preparation method of an ultrafine-grained Mg-3Al-1Zn alloy. 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 magnesium al...

Claims

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Application Information

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IPC IPC(8): C22F1/06B22C9/06B22D27/04
CPCC22F1/06B22C9/065
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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