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A method for refining the grain size of magnesium alloys

A grain size, magnesium alloy technology, applied in the field of refined magnesium alloy grain size, can solve the problems of reducing the corrosion resistance of magnesium alloys, increasing the cost of use, hindering the application and promotion, and achieving the effect of improving strength and plasticity

Active Publication Date: 2020-01-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the coexistence of Zr element and Al will deteriorate its grain refinement effect, so the Mg-Al alloy cannot use Zr as a grain refiner, and its application is extremely limited.
A large amount of Si will cause the formation of coarse Mg2Si phase in the Mg alloy, which will deteriorate its mechanical properties. Even if it is added in a small amount, it will greatly reduce the corrosion resistance of the magnesium alloy.
However, rare earth usually has high mining cost and high density, which not only greatly increases the cost of use, but also weakens the lightweight advantage of magnesium alloys, thus hindering its application and promotion
In addition, carbon-containing modifiers usually have a good grain refinement effect on most Mg-Al alloys, but such as CCl4, C2Cl6, etc. will cause a series of environmental problems, and the introduction of carbon will increase the corrosion rate of magnesium alloys

Method used

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  • A method for refining the grain size of magnesium alloys
  • A method for refining the grain size of magnesium alloys
  • A method for refining the grain size of magnesium alloys

Examples

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Embodiment 1

[0028] The invention discloses a method for refining the grain size of a magnesium alloy, which comprises the following steps:

[0029] S1: Preheat the resistance furnace with cast iron crucible to 660°C-680°C; put the alloy composition weighed by weight percentage into the preheating furnace for preheating, the preheating temperature is 200°C-300°C; Both resistance furnace and preheating furnace adopt gas protection;

[0030] S2: put the industrially pure magnesium weighed by weight percentage into the cast iron crucible;

[0031] S3: After the industrial pure magnesium is completely melted in the cast iron crucible, add the preheated alloy composition into the cast iron crucible;

[0032] S4: After the alloy composition is melted, raise the temperature of the resistance furnace to 725°C-735°C;

[0033] S5: Add the block-cut Al-B master alloy into the cast iron crucible, stir fully after the Al-B master alloy melts, and let it stand for 8-12 minutes; wherein, the Al-B maste...

Embodiment 2

[0039] The method and process parameters for refining the grain size of the magnesium alloy included in this example are basically the same as those in Example 1, except that in step S1, the alloy composition includes Al and Mg-5Mn, and the weight of Al in the magnesium alloy The percentage is 0.5-5.5 wt%, and the weight percentage of Mg-5Mn in the magnesium alloy is 1.0-10.0 wt%. The alloy composition and industrial pure magnesium are mixed and melted to form Mg-Al-Mn series magnesium alloy.

[0040] When the Al-B master alloy is added to the Mg-Al-Mn series magnesium alloy, the grain size of the magnesium alloy corresponding to the different weight percentage of B also changes. like Figure 1 to Figure 4 As shown, the grain size in the original AM50 without adding B was 550±150 μm; when adding 0.05wt% B, the grain size was significantly reduced to 320±96 μm; when the addition amount reached 0.1wt% B, the grain size was significantly reduced reduced to about 140 μm; when th...

Embodiment 3

[0042] The method and process parameters for refining the grain size of magnesium alloys included in this embodiment are basically the same as in embodiment 1 or embodiment 2, except that in step S1, CO2 and SF are used in the resistance furnace and the preheating furnace. The mixed gas is protected in the whole process according to the volume ratio V(CO2):V(SF6)=99:1. The mixed gas of CO2 and SF6 can effectively prevent the magnesium melt in the resistance furnace and the alloy composition in the preheating furnace from being oxidized by air.

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Abstract

The invention discloses a method for refining the grain size of a magnesium alloy. The method comprises the following steps that a resistance furnace with a cast iron crucible is preheated to 660 DEGC-680 DEG C; an alloy composition measured by weight percentage is put into a preheating furnace for preheating, and the preheating temperature is 200 DEG C-300 DEG C; commercially pure magnesium measured by the weight percentage is put into the cast iron crucible; the preheated alloy composition is added into the cast iron crucible; after the alloy composition is melted, the temperature of the resistance furnace is increased to 725 DEG C-735 DEG C; an AL-B intermediate alloy which is cut into blocks is added into the cast iron crucible, after the AL-B intermediate alloy is melted, fully stirring is performed, and standing is performed for 8-12 minutes; the Al-B intermediate alloy contains 3-4wt% of B and 96-97wt% of Al; and scum on the surface of a magnesium alloy molt in the cast iron crucible is wiped out, the magnesium alloy melt is poured into a swage with the temperature of 345 DEG C-355 DEG C, and after the swage is cooled, a magnesium alloy ingot casting can be obtained. The method for refining the grain size of the magnesium alloy can refine the grain of a magnesium aluminum alloy and improve the strength and plasticity of the magnesium aluminum alloy.

Description

technical field [0001] The invention relates to the technical field of production and processing of magnesium alloy materials, in particular to a method for refining the grain size of magnesium alloys. Background technique [0002] Magnesium-aluminum alloy is a common die-cast magnesium alloy with excellent casting properties and ductility, and is often used in the production of thin-walled automotive parts. Grain refinement can improve the strength and plasticity of metals at the same time, so the development of an efficient and low-cost grain refiner is an important way to improve the comprehensive properties of magnesium alloys. [0003] The commonly used magnesium-aluminum alloy grain refiners usually include Zr, Si, rare earth elements and carbon-containing modifiers. Among them, the coexistence of Zr element and Al will deteriorate its grain refinement effect, so the Mg-Al alloy cannot use Zr as a grain refiner, and its application is extremely limited. A large amoun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03
CPCC22C1/03
Inventor 宋江凤潘复生张烁刘强肖毕权蒋斌
Owner CHONGQING UNIV
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