Method for casting Mg-Al-Zn based magnesium alloy with high strength and high tenacity

A high-strength technology for casting magnesium alloys, which is applied in the field of casting magnesium alloys, can solve problems such as low yields, and achieve the effects of low preparation costs, fully refined grains, and high cost performance

Active Publication Date: 2008-07-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many researchers have carried out microalloying and grain refinement based on the AZ91 series and AM60 / 50 series, the results have not achieved much

Method used

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  • Method for casting Mg-Al-Zn based magnesium alloy with high strength and high tenacity
  • Method for casting Mg-Al-Zn based magnesium alloy with high strength and high tenacity
  • Method for casting Mg-Al-Zn based magnesium alloy with high strength and high tenacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The basic operation steps of the present embodiment 1 alloy are as follows:

[0043] I), alloy composition:

[0044] The alloy of Example 1 is prepared from commercially available high-purity raw materials. Its chemical composition was analyzed using inductively coupled plasma-atomic emission spectroscopy (ICP-AES) technique. The chemical composition of the alloy of Example 1 is shown in the table below.

[0045]

[0046] II), alloy smelting and casting molding:

[0047] The smelting work of Example 1 is carried out in a pit furnace, and the crucible is made of carbon steel; the casting of the alloy is completed in a metal mold. Among them, the manufacturers of RJ-2 covering / refining agent, RJ-1 washing flux and magnesite modification agent are Bohang Chemical Plant in Dashiqiao City, Liaoning Province. The detailed preparation process is as follows:

[0048] 1) Drying and preheating: the drying temperature of auxiliary materials (RJ-2 covering / refining agent, m...

Embodiment 2

[0067] The difference from Example 1 is:

[0068] The basic operation steps of the alloy in this embodiment are as follows:

[0069] I), alloy composition:

[0070]

[0071] II), alloy smelting and casting molding:

[0072] It is the same as the smelting and casting molding part in embodiment 1.

[0073] III), heat treatment of castings:

[0074] The specific conditions of the T61 heat treatment in Example 2 are the same as the heat treatment in Example 1.

[0075] IV), microstructure characterization

[0076] The sample preparation and characterization means for microstructure observation are the same as in Example 1. attached Image 6 It is the backscattered scanning electron microscope image of the alloy of Example 2 in the as-cast state. attached Figure 7 It is the backscattered scanning electron microscope picture of the T41 state embodiment 2 alloy. It can be seen from the above two figures that the crystal grains of the alloy in Example 2 have achieved a ve...

Embodiment 3

[0082] The difference from Example 1 is:

[0083] The basic operation steps of the alloy in this embodiment are as follows:

[0084] I), alloy composition:

[0085]

[0086] II), alloy smelting and casting molding:

[0087] It is the same as the smelting and casting molding part in embodiment 1.

[0088] III), heat treatment of castings:

[0089] attached Figure 9 It is the cooling curve of embodiment 3 alloy. It can be seen from the figure that the alloy of Example 3 has two temperature inflection points (375°C and 354°C) near the solidus line. According to the aforementioned heat treatment principles, two heat treatments, T61 and T62, were performed on the alloy of Example 3.

[0090]The T61 heat treatment is partly the same as the heat treatment in Example 1. The specific conditions of T62 heat treatment are: first pretreatment at 300°C for 2 hours, then set the heat treatment temperature at 340°C for 10 hours, finally set the heat treatment temperature at 365°C ...

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Abstract

A method for casting high-strength and-toughness Mg-Al-Zn based Mg-alloy includes such steps as baking auxiliaries, proportional mixing, pre-heating tools, smelting Mg ingot, refining, modifying, laying aside while holding its temp, casting and solidifying. Said Mg-alloy contains Al (3-9 Wt %), Zn (3.5-9), Mn (0.15-1.0), Sb (0-2), and Al (rest).

Description

technical field [0001] The invention relates to casting magnesium alloy technology, in particular to a method for obtaining high strength and high toughness of Mg-Al-Zn based casting magnesium alloy. The invention introduces the magnesite modification technology into the magnesium alloy system with medium aluminum and zinc content, and improves the traditional magnesium-aluminum alloy smelting process, so that the crystal grains of the magnesium alloy prepared by the technology are fully refined. Through the optimized smelting process and / or microalloying and optimized heat treatment, the mechanical properties of the magnesium alloy prepared by the invention are further improved, and the tensile strength thereof reaches more than 300 MPa. Background technique [0002] As a new type of lightweight metal material, magnesium alloy has been widely used in aerospace, transportation, 3C products and many other fields due to its excellent specific strength and other advantages. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D21/02C22C23/04
Inventor 马跃群陈荣石韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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