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High strength and high toughness cast magnesium alloy and preparing process thereof

A technology for casting magnesium alloys and high toughness is applied in the field of casting magnesium alloys, which can solve the problems of low efficiency and high cost, and achieve the effects of low cost, high cost performance and stable process.

Inactive Publication Date: 2007-09-19
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 are not effective or the cost is too high

Method used

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  • High strength and high toughness cast magnesium alloy and preparing process thereof
  • High strength and high toughness cast magnesium alloy and preparing process thereof
  • High strength and high toughness cast magnesium alloy and preparing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The basic operation steps of the present embodiment 1 alloy (comparative example 1 alloy AZ91, comparative example 2 alloy AM60) are as follows:

[0038]

Alloy grade

Element content (weight percent %)

Magnesium (Mg)

Aluminum (Al)

Zinc (Zn)

Manganese (Mn)

Antimony (Sb)

Example 1

89.2

6

4

0.3

0.5

AZ91

89.7

9

1

0.3

0

AM60

93.7

6

0

0.3

0

[0039] II), alloy smelting and casting molding:

[0040] 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. The detailed procedure is as follows:

[0041] 1) Preheat various ingredients such as pure magnesium, pure aluminum, aluminum-manganese intermediate alloy, pure zinc, antimony powder, etc. Preheat to 350°C in a box-type furnace, then set the target temperature of ...

Embodiment 2

[0068] The difference from Example 1 is:

[0069] The basic operation steps of the alloy in this embodiment are as follows:

[0070]

Alloy grade

Element content (weight percent %)

Magnesium (Mg)

Aluminum (Al)

Zinc (Zn)

Manganese (Mn)

Example 2

88.7

6

5

0.3

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

[0072] Refer to Example 1. In the third step of the smelting process, the alloy of this embodiment does not need to add antimony powder ingredients wrapped in aluminum foil.

[0073] III), heat treatment of castings:

[0074] Refer to the heat treatment section in Example 1. The temperature of the T4 solid solution treatment of the alloy in this embodiment is preferably 370° C. This temperature is determined by referring to the phase diagram of the magnesium-aluminum-zinc ternary alloy and finally determined by experiments. If the temperature is too high, phase transformation and precipitation...

Embodiment 3

[0087] The difference from Example 1 is:

[0088] The basic operation steps of the alloy in this embodiment are as follows:

[0089]

Alloy grade

Element content (weight percent %)

Magnesium (Mg)

Aluminum (Al)

Zinc (Zn)

Manganese (Mn)

Yttrium (Yt)

Example 2

88.2

4

7

0.3

0.5

[0090] II), alloy smelting and casting molding:

[0091] Refer to Example 1. In the third step of the smelting process of the alloy in this embodiment, after the addition of pure aluminum and aluminum-manganese master alloy ingredients, the magnesium-yttrium master alloy ingredients are added, and finally the pure zinc ingredients are added.

[0092] III), heat treatment of castings:

[0093] Refer to the heat treatment section in Example 1. The temperature of the T4 solid solution treatment of the alloy in this embodiment is preferably 360° C. This temperature is determined by referring to the phase diagram of the ...

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Abstract

The present invention relates to a high strength and high toughness cast magnesium alloy and its preparation process. The compositions (wt%) are as follows:: Al3-9,Zn 3.5-9.Mn 0.15-1.0, Sb 0-2, Re 0-2. The various raw materials, covering reagent and mould are preheated first. The temperature of crucible is setup beforehand, and the preheated pure Magnesium is charged in the crucible, and then pure aluminum, Al-Mn interalloy, Mg-Re interalloy and pure zinc are also added in turn under the protection of mixed gas of CO2 + SF6, and finally Sb powder wrapped with Al foil is added. After stirring, slag removing, casting and forming, the product alloy ingot is obtained. The tensile strength sigma b reaches 260-280MPa, yielding strength sigma 0.2 >=140MPa, elongation delta 5 >= 6%, impingement work alpha k >= 14 J and Brinel hardness HB >= 70 after treatment of solid solution and aging(T6).

Description

technical field [0001] The invention relates to casting magnesium alloy technology, in particular to a low-cost, high-strength and high-toughness casting magnesium alloy and a preparation method for simultaneously improving the strength and toughness of the casting magnesium alloy through alloying and heat treatment. The invention is not only applicable to metal mold and sand mold casting, but also applicable to pressure casting, squeeze casting and other processes. Background technique [0002] As a new type of metal material, magnesium alloy has been widely used in aerospace, automobile, 3C (computer, communication, consumer electronics) and other fields due to its advantages of low density, high specific strength and specific stiffness. Take the automobile industry as an example: On the one hand, automobile exhaust emissions account for about 65% of global air pollution; on the other hand, problems such as energy shortage and rising oil prices are becoming more and more s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/02C22C23/02
CPCC22F1/06C22C23/02C22C23/04C22C1/02B22D21/007
Inventor 马跃群陈荣石韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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