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Production method for AZ91D alloy with ultra-fine grain solidification structure

A technology of solidification structure and ultra-fine grains, which is applied in the field of AZ91D alloy preparation, which can solve the problems of limited refining effect, the distribution and morphology are not substantially improved, and the average grain size is difficult to reach below 100 microns.

Active Publication Date: 2017-02-22
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the refinement effect is limited, and the average grain size is difficult to reach below 100 microns, and β-Mg 17 Al 12 Phase distribution and morphology have not been substantially improved

Method used

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  • Production method for AZ91D alloy with ultra-fine grain solidification structure
  • Production method for AZ91D alloy with ultra-fine grain solidification structure
  • Production method for AZ91D alloy with ultra-fine grain solidification structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method of an AZ91D alloy with ultra-fine grain solidification structure, comprising the following steps:

[0046] (1) Pretreatment: AZ91D alloy ingots were taken for diffusion annealing, and wire-cut into samples with a diameter of 10 mm and a length of 6 mm;

[0047] (2) Sample high-pressure solidification treatment: place the sample in step (1) in a CS-1B high-pressure six-sided top press for high-pressure solidification treatment, set the solidification pressure and preset temperature, and raise the pressure to solidification The pressure is 2GPa, and at the same time, it is rapidly heated to the preset temperature of 950°C, and then kept at this temperature for heat preservation and pressure, and then the heating is stopped for 18 minutes, and it is naturally cooled to room temperature under the pressure-holding condition, and it is ready after the pressure is released.

Embodiment 2

[0049] A preparation method of an AZ91D alloy with ultra-fine grain solidification structure, comprising the following steps:

[0050] (1) Pretreatment: AZ91D alloy ingots were taken for diffusion annealing, and wire-cut into samples with a diameter of 12 mm and a length of 6 mm;

[0051] (2) Sample high-pressure solidification treatment: place the sample in step (1) in a CS-1B high-pressure six-sided top press for high-pressure solidification treatment, set the solidification pressure and preset temperature, and raise the pressure to solidification The pressure is 3GPa, and at the same time, it is rapidly heated to the preset temperature of 900°C, and then kept at this temperature for heat preservation and pressure, and then the heating is stopped for 20 minutes, and it is naturally cooled to room temperature under the pressure-holding condition, and the product is obtained after pressure relief.

Embodiment 3

[0053] A preparation method of an AZ91D alloy with ultra-fine grain solidification structure, comprising the following steps:

[0054] (1) Pretreatment: AZ91D alloy ingots were taken for diffusion annealing, and wire-cut into samples with a diameter of 6 mm and a length of 6 mm;

[0055](2) Sample high-pressure solidification treatment: place the sample in step (1) in a CS-1B high-pressure six-sided top press for high-pressure solidification treatment, set the solidification pressure and preset temperature, and raise the pressure to solidification The pressure is 4GPa, and at the same time, it is rapidly heated to the preset temperature of 850°C, and then kept at this temperature for heat preservation and pressure, and then the heating is stopped for 15 minutes, and it is naturally cooled to room temperature under the pressure-holding condition, and the product is obtained after pressure relief.

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Abstract

The invention discloses a production method for AZ91D alloy with the ultra-fine grain solidification structure. The method includes the steps of 1, preprocessing and 2, high-pressure solidifying of samples. In the step 1, diffusion annealing is carried out on an AZ91D alloy ingot and the AZ91D alloy ingot is cut into the samples; and in the step 2, the samples in the step 1 are placed into a CS-1B type high-pressure cubic press for high-pressure solidification and then products are obtained. According to the production method for the AZ91D alloy with the ultra-fine grain solidification structure, the obtained products are high in strength and plasticity. In the AZ91D alloy obtained through the method, the grain size of a Mg substrate is reduced to 10 micrometers from 350 micrometers of virgin alloy, the dendritic structure is obviously refined, and the mode of distributing a beta-Mg17Al12 phase among dendritic crystals in a skeleton shape in a netted form of the virgin alloy is changed into the mode of distributing the beta-Mg17Al12 phase among the dendritic crystals in the shape of nanoscale particles in a dispersed form.

Description

technical field [0001] The invention relates to a method for preparing an AZ91D alloy with an ultra-fine grain solidification structure, and specifically belongs to the technical field of alloy preparation. Background technique [0002] Magnesium alloy has the characteristics of excellent electrical conductivity, thermal conductivity, electromagnetic shielding performance, high specific strength, specific stiffness, and shock absorption. It is currently the lightest metal structural material in practical application. and consumer electronics) and other industries have broad application prospects. However, the further application of magnesium alloys in industry is limited due to the problems of low strength, poor toughness, difficult plastic processing, and poor high-temperature creep properties. Therefore, improving the mechanical properties of magnesium alloys through various preparation technologies and expanding the application range of magnesium alloys are the focus of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22F3/00C22C23/02B22D27/11
CPCB22D27/11C22C23/02C22F1/06C22F3/00
Inventor 王林林小娉樊志斌李婵李传会陈思苗琳坤刘陈
Owner 东北大学秦皇岛分校