A kind of preparation method of az91d alloy with ultra-fine grain solidification structure

A technology of solidification structure and ultra-fine grain, which is applied in the field of preparation of AZ91D alloy, can solve the problems of limited refinement effect, no essential improvement in distribution and shape, and difficulty in achieving an average grain size below 100 microns.

Active Publication Date: 2020-05-15
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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  • A kind of preparation method of az91d alloy with ultra-fine grain solidification structure
  • A kind of preparation method of az91d alloy with ultra-fine grain solidification structure
  • A kind of preparation method of az91d alloy with ultra-fine grain solidification structure

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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 preparation method of an AZ91D alloy with an ultra-fine grain solidification structure, comprising the following steps: (1) pretreatment: taking an AZ91D alloy ingot for diffusion annealing, and cutting it into samples; (2) high-pressure solidification of the sample Processing: Place the sample in step (1) in a CS-1B high-pressure six-sided top press for high-pressure solidification treatment to obtain the product. The invention provides a method for preparing an AZ91D alloy with an ultra-fine grain solidification structure, and the obtained product has high strength and good plasticity. In the AZ91D alloy prepared by the method of the present invention, the Mg matrix grain size is reduced from 350 μm of the original alloy to 10 μm, and the dendrite structure is significantly refined; 17 al 12 The phase changes from the "skeleton" shape of the original alloy to the network distribution among the dendrites to the dispersed distribution among the dendrites in the form of nano-scale particles.

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 Patents(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
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