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Multi-element Mg-Zn-Al based magnesium alloy and preparation method thereof

An alloy and magnesium-based technology, which is applied to industrial magnesium alloys, multi-component Mg-Zn-Al-based magnesium alloys and their preparation fields, can solve problems such as adverse effects on plasticity and tensile strength, and achieve convenient implementation, simple preparation process, The effect of improving creep resistance

Inactive Publication Date: 2013-03-13
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of alloying elements, coarse, continuous network-like compounds are often formed, which will adversely affect the relative plasticity and tensile strength.

Method used

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  • Multi-element Mg-Zn-Al based magnesium alloy and preparation method thereof
  • Multi-element Mg-Zn-Al based magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Taking Mg-12Zn-5Al-0.4Mn-0.2Sr-0.008Ti alloy as an example

[0036] Carry out batching according to following mass percentage:

[0037] Zn: 12%

[0038] Al: 5%

[0039] Mn: 0.4%

[0040] Sr: 0.2%

[0041] Ti: 0.008%

[0042] The balance is Mg

[0043] Prepare:

[0044] The casting mold is made of top-injected water-cooled copper mold with a diameter of 60 mm. The mold is cleaned before use, and the model is preheated to 120-150°C, cooled to 70-80°C, sprayed with paint, and then preheated to 120-200°C for use. The mold coating is mainly prepared from talcum powder, boric acid, water glass and water at 60°C.

[0045] Clean up the smelting tools (mainly derusting), preheat to 200-300°C and spray paint, the paint components are mainly prepared from chalk powder, graphite powder, boric acid, water glass and water at 60°C.

[0046] Prepare ingredients:

[0047] The raw materials are properly treated and cleaned to remove corrosion, solvents, sand, scale, etc. on the...

Embodiment 2

[0060] Taking Mg-10Zn-4Al-0.3Mn-0.4Ca-0.01Ti alloy as an example

[0061] Carry out batching according to following mass percentage:

[0062] Zn: 10%

[0063] Al: 4%

[0064] Mn: 0.3%

[0065] Ca: 0.4%

[0066] Ti: 0.01%

[0067] The balance is Mg

[0068] The preparation process and implementation process are the same as in Example 1, wherein: (3) Step refining temperature is 740°C, the total amount of refining agent used is 1.5%, and the melt is left to stand for 15 minutes after refining, during which the surface melt is skimmed every 5 minutes. scum.

[0069] heat treatment:

[0070] The solution treatment temperature is 340°C, and the solution time is 24 hours. Use normal temperature water as the medium for quenching treatment. The artificial aging temperature is 200°C.

[0071] The metallographic structure shows that compared with Example 1, the main element Zn content in Example 2 is reduced, and the alloy intermediate phase is significantly reduced. The terna...

Embodiment 3

[0073] Taking Mg-8Zn-3Al-0.2Mn-0.2Ca-0.2Sr-0.012Ti alloy as an example

[0074] Carry out batching according to following mass percentage:

[0075] Zn: 8%

[0076] Al: 3%

[0077] Mn: 0.2%

[0078] Ca: 0.2%

[0079] Sr: 0.2%

[0080] Ti: 0.012%

[0081] The balance is Mg

[0082] The preparation process and implementation process are the same as in Example 1, wherein: (3) Step refining temperature is 750°C, the total amount of refining agent is 1.5%, and the melt is left to stand for 15 minutes after refining, during which the surface melt is skimmed every 5 minutes. scum.

[0083] heat treatment:

[0084] The solution treatment temperature is 340°C, and the solution time is 18 hours. Use normal temperature water as the medium for quenching treatment. The artificial aging temperature is 200°C.

[0085] The morphology of the metallographic structure shows that after adding trace amounts of Ca, Sr, and Ti based on Mg-8Zn-3Al-0.2Mn, the ternary mesophase in the structu...

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Abstract

The invention relates to low-cost multi-element Mg-Zn-Al based high-strength heat-resistant magnesium alloy and a preparation method thereof. The alloy comprises the following chemical components in percentage by mass: 8-12% of zinc, 3-5% of aluminum, 0.2-0.4% of manganese, one or more of 0.2-0.6% of strontium, 0.1-0.7% of calcium and 0.005-0.015% of titanium, immunity elements including iron of less than 0.005%, copper of less than 0.015% and nickel of less than 0.002%, and the balance of magnesium. According to the invention, by adding strontium, calcium and trace titanium to form Mg-Zn-Al-(Sr, Ca) high-temperature stable phase, the heat resistance of alloy is improved; and the alloy grains and the strengthening phase structure are refined, and the distribution of the alloy composition phase is improved. Through the invention, the adverse impact on the relative elasticity and tensile strength of compound caused by adding strontium and calcium only to form thick and continuous net distribution is avoided. The multi-element Mg-Zn-Al based magnesium alloy provided by the invention does not contain rare element, is low in cost, enhances the room-temperature and high-temperature tensile mechanical property of alloy, and obviously improves the high-temperature creep resistance.

Description

technical field [0001] The invention relates to a multi-component Mg-Zn-Al-based magnesium alloy and a preparation method thereof, belonging to the category of industrial magnesium alloys. Background technique [0002] Mg-Al and Mg-Al-Zn series magnesium alloys are currently the most widely used series of magnesium alloys, but due to the existence of β phase, the high-temperature creep resistance is poor, and the long-term working temperature cannot exceed 120°C, so they cannot be used in manufacturing High temperature components, thus limiting its further application in the automotive industry, aerospace industry. However, the existing heat-resistant magnesium alloys such as Mg-Al-Si, Mg-Al-RE and Mg-RE have limited their wide application in the industry due to their poor casting properties and high production costs. Therefore, the development of low-cost heat-resistant magnesium alloys with good comprehensive properties is still a research hotspot in the field of magnesiu...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03C22C1/06
Inventor 万晓峰
Owner NANTONG UNIVERSITY