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Method for refining Mn-containing Mg-Zn-Al series cast magnesium alloy grains

A technology for casting magnesium alloys and grain refinement, which is applied in the direction of improving process efficiency, can solve problems such as unfavorable magnesium alloy application scope, increase production costs, etc., to ensure mechanical properties and corrosion resistance, improve quality, and simple methods. controllable effect

Pending Publication Date: 2022-07-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the way of refining grains in external field requires the use of complex instruments and equipment, which increases production costs; and some methods of refining grains by adding expensive grain refining agents are not conducive to expanding the application range of magnesium alloys and other issues The present invention provides a method for grain refinement of Mn-containing Mg-Zn-Al series cast magnesium alloys, that is, magnesium carbonate powder is used as a grain refiner to crystallize Mg-Zn-Al-Cu-Mn alloys. Grain refinement, to obtain cast magnesium alloy products with yield strength higher than 220MPa and elongation higher than 10%

Method used

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  • Method for refining Mn-containing Mg-Zn-Al series cast magnesium alloy grains
  • Method for refining Mn-containing Mg-Zn-Al series cast magnesium alloy grains
  • Method for refining Mn-containing Mg-Zn-Al series cast magnesium alloy grains

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Example 1: Low-cost and high-strength Mg-Zn-Al-Mn-Cu cast magnesium alloy, 0.2% mass fraction of magnesium carbonate was added as a grain refiner during the smelting process, and the constituent elements and weight percentages were: Zn 10.0% , Al 1.0%, Mn 0.3%, Cu 0.5%, the rest are Mg and unavoidable impurities in the smelting process, and the total content of impurities is less than 0.1%; element addition method: Mg, Zn, Al, Cu to pure Mg (99.97% ) block, pure Zn (99.9%) block, pure Al (99.7% block), pure Cu (99.9%) block are added, and Mn element is added in the form of Mg-5wt.%Mn master alloy;

[0044] (1) Batching: The raw materials are pure metal Mg, pure metal Zn, pure metal Al, pure metal Cu and Mg-5wt.%Mn master alloy, and are batched according to the weight percentage; before smelting, the oxide film on the surface of the raw material is polished and cleaned , and consider the element burning loss in the smelting process, and calculate the element burning loss...

Embodiment 2

[0053] Example 2: Low-cost and high-strength Mg-Zn-Al-Mn-Cu cast magnesium alloy, 0.5% mass fraction of magnesium carbonate was added as a grain refiner during the smelting process, and the constituent elements and weight percentages were: Zn 10.0% , Al 1.0%, Mn 0.3%, Cu 0.5%, the rest are Mg and unavoidable impurities in the smelting process, and the total content of impurities is less than 0.1%; element addition method: Mg, Zn, Al, Cu to pure Mg (99.97% ) block, pure Zn (99.9%) block, pure Al (99.7% block), pure Cu (99.9%) block are added, and Mn element is added in the form of Mg-5wt.%Mn master alloy;

[0054] (1) Batching: The raw materials are pure metal Mg, pure metal Zn, pure metal Al, pure metal Cu and Mg-5wt.%Mn master alloy, and are batched according to the weight percentage; before smelting, the oxide film on the surface of the raw material is polished and cleaned , and consider the element burning loss in the smelting process, and calculate the element burning loss...

Embodiment 3

[0063] Example 3: High-strength Mg-Zn-Al-Mn-Cu cast magnesium alloy, the constituent elements and weight percentages are: Zn 10.0%, Al 1.0%, Mn 0.3%, Cu 0.5%, the rest are Mg and the smelting process Inevitable impurities, the total content of impurities is less than 0.1%; element addition method: Mg, Zn, Al, Cu, pure Mg (99.97%) block, pure Zn (99.9%) block, pure Al (99.7% block), pure Cu (99.9%) is added in bulk, and Mn is added in the form of Mg-5wt.%Mn master alloy;

[0064] (1) Batching: The raw materials are pure metal Mg, pure metal Zn, pure metal Al, pure metal Cu and Mg-5wt.%Mn master alloy, and are batched according to the weight percentage; before smelting, the oxide film on the surface of the raw material is polished and cleaned , and consider the element burning loss in the smelting process, and calculate the element burning loss rate according to the actual situation;

[0065](2) Smelting: after preheating the raw materials in step (1) at a temperature of 180-20...

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Abstract

The invention relates to a method for refining Mn-containing Mg-Zn-Al series cast magnesium alloy grains, and belongs to the field of Mg-Zn-Al series cast magnesium alloy preparation. The preparation method comprises the following steps: preheating raw materials, putting metal Mg, metal Al, metal Zn, metal Cu and Mg-5wt.% Mn intermediate alloy into a smelting furnace, introducing protective gas, smelting at the temperature of 720-760 DEG C until the metal is completely molten, and keeping the temperature for 10-15 minutes to obtain an alloy melt A; adding dry magnesium carbonate powder into the alloy melt A, uniformly stirring, slagging, and standing for 10-20 minutes to obtain a grain refined alloy melt B; an RJ-6 refining agent is adopted for conducting purification and refining treatment on the alloy melt B obtained after grain refinement for 5-10 min, the temperature of the melt is adjusted to 720-740 DEG C after slagging-off treatment, standing is conducted for 20-40 min, and a refined alloy melt C is obtained; pouring the refined alloy melt C into a preheating mold, demolding, and cooling to room temperature in air to obtain an alloy ingot; and the alloy ingot is subjected to solid solution-two-stage aging treatment to obtain the magnesium alloy ingot. Cast magnesium alloy grains are refined through magnesium carbonate, and the magnesium alloy is high in yield strength and good in plasticity after heat treatment.

Description

technical field [0001] The invention relates to a method for refining grains of Mg-Zn-Al cast magnesium alloys containing Mn, belonging to the field of preparation of Mg-Zn-Al cast magnesium alloys. Background technique [0002] Magnesium alloy has a series of advantages such as low density, high specific strength and specific stiffness, strong electromagnetic shielding ability, good shock absorption performance, and easy recycling. It is the lightest metal engineering structural material in practical application. Magnesium alloys play a significant role in achieving light weight, reducing energy consumption, and reducing environmental pollution. [0003] At present, magnesium alloys used in industry mainly include cast and wrought magnesium alloys. Casting magnesium alloy accounts for 70% of the total magnesium alloy product consumption. However, the low yield strength and insufficient toughness of traditional cast magnesium alloys such as AZ91D and AM60B are still the ke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C23/04C22F1/06
CPCC22C1/03C22C1/06C22C23/04C22F1/06Y02P10/20
Inventor 谭军陈一鸣刘继江何光明李思睿黄博炎周云轩宋江凤陈先华蒋斌潘复生
Owner CHONGQING UNIV
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