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High strength and high ductility magnesium alloy and its preparation method

a high-ductility, magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of low ductility, and limiting the application of magnesium alloys, and achieves the effects of excellent specific strength, good damping capacity, and superior machinability and castability

Inactive Publication Date: 2009-03-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]It is an object of this invention to provide magnesium alloys with good combination of high strength and high ductility by small amount of proper alloying element addition and proper heat treatments.

Problems solved by technology

However, the low strength and / or ductility of magnesium alloys, relative to aluminum alloys, have greatly restricted their applications, such as application on the wheels of lightweight vehicles, where high strength and high ductility are both required.
Referring to Table 1, die casting magnesium AZ91, which is the most widely used alloy, have a high strength, but its relatively low ductility restrains its applications; On the other hand, die casting magnesium alloy AM60 has high ductility, but its medium strength also limits its applications; Although there are a few Mg-RE casting magnesium alloys, such as ZE63, bear high strength and high ductility at the same time, but the high cost and complicated heat treatment procedure make them difficult to apply.
Many attempts to improve the tensile properties of magnesium alloys have been done, however, most of them are focused on the elevated-temperature tensile properties, and the room-temperature tensile properties of these attempts are limited.

Method used

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  • High strength and high ductility magnesium alloy and its preparation method
  • High strength and high ductility magnesium alloy and its preparation method
  • High strength and high ductility magnesium alloy and its preparation method

Examples

Experimental program
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Effect test

example-1

I) The Compositions

[0057]Three magnesium alloys were prepared in a mild steel crucible using commercial high-purity raw materials. Among them, commercial alloy AZ91 and AM60 acted as reference alloys. Chemical composition analyses of the three alloys were performed by inductively coupled plasma atomic emission spectroscopy (ICP-AES) and the chemical compositions are listed in Table 2.

TABLE 2The chemical composition of three alloys (wt %)AlloysAlZnMnSbMgAZ919.001.030.29—Bal.AM605.92—0.28—Bal.Example-15.883.890.300.51Bal.

II) The Smelting and Casting

[0058]The smelting was carried out in a resistance furnace and a crucible having a capacity of 15 kg. The crucible and the casting mold were made of mild steel. Taking Example-1 alloy as an example, the smelting and casting processes are described in detail as following:[0059]1) Set the temperature of the crucible to 720° C. and start heating. Preheat the raw material (pure magnesium, pure aluminum, Al—Mn master alloy, pure antimony, pure Z...

example-2

I) The Compositions

[0079]The chemical composition of Example-2 is listed in Table 4.

TABLE 4Alloys Composition of Example-2 (wt %)AlloysAlZnMnSbMgExample-26.165.080.310.48Bal.

II) The Smelting and Casting

[0080]Referring to the smelting and casting of Example-1. The difference mainly lies in the zinc content of the two alloys.

III) The Heat Treatments

[0081]Referring to the heat treatments of Example-1. The difference mainly lies in that the temperature of T4 temper was 360° C. according to the DTA analysis of Example-2, and the heating duration was 12 hours. The artificial ageing temperature of T5 temper was 180° C. and the duration was 16 hours.

IV) The Mechanical Properties

[0082]Referring to the tests of various mechanical properties of Example-1.

TABLE 5The room temperature mechanical properties of Example-2HeatYTSUTSElongationBrinellImpactTreatment(MPa)(MPa)(%)HardnessEnergy (J)As cast11021086315T6 temper14525067412

[0083]The comparison of 150° C. tensile property between Example-2 and...

example-3

I) The Compositions

[0084]The chemical composition of Example-3 is listed in Table 6.

TABLE 6Alloys Composition of Example-3 (wt %)AlloysAlZnMnSbMgExample-35.896.740.350.53Bal.

II) The Smelting and Casting

[0085]Referring to the smelting and casting of Example-1. The difference mainly lies in the zinc content of the two alloys.

III) The Heat Treatments

[0086]Referring to the heat treatments of Example-1. The difference mainly lies in that the temperature of T4 temper was 350° C. according to the DTA analysis of Example-3, and the heating duration was 12 hours. The artificial ageing temperature of T5 temper was 180° C. and the duration was 16 hours.

IV) The Mechanical Properties

[0087]Referring to the tests of various mechanical properties of Example-1.

TABLE 7The room temperature mechanical properties of Example-3HeatYTSUTSElongationBrinellImpactTreatment(MPa)(MPa)(%)HardnessEnergy (J)As cast1152026.56713T6 temper1532605779

[0088]The comparison of 150° C. tensile property between Example-3 an...

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Abstract

The present invention relates to a high strength and high ductility magnesium alloy and its preparation method. The magnesium alloy in the present invention contains 3˜9 wt % of aluminum, 3.5˜9 wt % of zinc, 0.15˜1 wt % of manganese, 0.01˜2 wt % of antimony, and balanced magnesium. The alloy may further comprise 0˜2 wt. % of one element selected from the group consisting of mischmetal, calcium, and silicon. The room temperature mechanical properties of the T6 heat-treated typical alloy in the present invention are as following: Ultimate Tensile Strength of more than or equal to 270 Mpa, Yield Tensile Strength of more than or equal to 140 Mpa, Elongation of more than or equal to 6%, Brinell hardness of more than or equal to 70, Impact Energy of more than or equal to 12 J. Some of the alloys in the present invention not only possess superior room temperature mechanical properties, but also have very good high temperature mechanical properties. The main alloying elements are easily obtainable and the preparation cost is low enough to meet the demands of large-scale production. The alloy according to the present invention was applicable for most of the casting processes, such as permanent casting, sand casting, die casting, and squeeze casting.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The invention related to a magnesium alloy and its preparation method. An object of the invention is to create a casting magnesium-based alloy having high strength and high ductility at low cost. The present invention was not only applicable for permanent casting process, but also shall be applicable for other processes such as sand casting, die casting, and squeeze casting.BACKGROUND OF THE INVENTION[0002]As a lightweight metallic material, magnesium alloy has many advantages, such as excellent specific strength, superior machinability and castability, good damping capacity, good dimensional stability, and ability of electromagnetic shielding. Due to these advantages, magnesium alloy parts have already extensively applied in many industrial branches, including manufactures of automobiles, 3C products (Computer, Communication, Consumer Electrics), and military weapons, etc. In recent years, because of the ever-pressing weight reduction demand, m...

Claims

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Application Information

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IPC IPC(8): C22C23/02B22D23/00B22D27/04C22C1/02C22C23/00
CPCB22D21/007C22C1/02C22F1/06C22C23/04C22C23/02
Inventor MA, YUEQUNCHEN, RONGSHIHAN, ENHOU
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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