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Middle-toughness high-formability heat-resisting magnesium alloy

A magnesium alloy and formability technology, applied in the field of magnesium alloys, can solve the problems of high price of Nd and the need to improve the formability of the alloy, so as to hinder the high temperature grain boundary slip, improve the high temperature mechanical properties and formability, and have excellent strength and toughness. Effect

Active Publication Date: 2013-07-24
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above two patents improve the high-temperature mechanical properties of Mg-Al alloys by adding Nd alone or adding Gd and Ca in combination, but the added Nd is more expensive, and the addition of Ca will lead to a serious hot cracking tendency, while the formability of the alloy still needs to be improved

Method used

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Embodiment 1

[0025] The weight percent of the alloy composition is: Al 3.0%, Sm 0.5% and Bi 0.3%, and the balance is Mg.

[0026] The as-cast room temperature tensile strength and elongation of Example 1 are 198 MPa and 7.0%, respectively, and the tensile strength and elongation at 150°C are 169 MPa and 26.5%, respectively, and the as-cast flow length is 410mm.

Embodiment 2

[0028] The weight percent of the alloy composition is: Al 6.0%, Sm 1.0% and Bi 0.3%, and the balance is Mg.

[0029] The as-cast room temperature tensile strength and elongation of embodiment 2 are respectively 220MPa and 12.5%, the tensile strength at 150 ℃ and elongation are respectively 162MPa and 14.5%, and the as-cast flow length is 460mm; The die-cast room temperature tensile strength and The elongation is 285MPa and 16.5%, respectively, and the flow length of the die-casting state is 1870mm.

Embodiment 3

[0031] The weight percent of the alloy composition is: Al 7.0%, Sm 3.0% and Bi 0.75%, and the balance is Mg.

[0032] The as-cast room temperature tensile strength and elongation of Example 3 are 210MPa and 12.0%, respectively, and the tensile strength and elongation at 150°C are 151MPa and 13.5%, respectively, and the as-cast flow length is 430mm.

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Abstract

The invention provides middle-toughness high-formability heat-resisting magnesium alloy. The middle-toughness high-formability heat-resisting magnesium alloy is characterized by comprising the following components in percentage by weight: 3.0-7.0% of Al, 0.5-3.0% of Sm, 0.3-0.75% of Bi and the balance of Mg. The tensile strength and the elongation percentage of the magnesium alloy in cast state at room temperature are respectively 220Mpa and 12.5%, and the tensile strength and the elongation percentage at 150 DEG C are respectively 162Mpa and 14.5%; under the same conditions, compared with AZ6l alloy, the magnesium alloy has the advantages that the tensile strength and the elongation percentage at room temperature are respectively increased by 7.3% and 127%, the tensile strength and the elongation percentage at 150 DEG C are respectively increased by 15.7% and 123%; and compared with the flowability of AZ9lD, the flowability of the magnesium alloy in cast state is increased by 36.6%. The tensile strength and the elongation percentage of the magnesium alloy in die-casting state at room temperature are respectively 285Mpa and 16.5%, and the flowability of the magnesium alloy in die-casting state is slightly lower than that of AZ91D alloy. The middle-toughness high-formability heat-resisting magnesium alloy has middle toughness, excellent forming property and excellent high-temperature performance and is suitable for industries such a rail transit, automobiles, sports equipment and 3C (computer, communication and consumer electronic).

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a heat-resistant magnesium alloy with medium strength, toughness and high formability. Background technique [0002] Magnesium alloys have the advantages of light density, high specific strength and specific stiffness, and easy recycling. They have broad application prospects in the fields of automobiles, communication electronics, and aerospace. However, the high temperature mechanical properties of magnesium alloys are poor. When the temperature rises, its strength and creep resistance tend to drop significantly, so it is difficult to use it as a component that is used at high temperature for a long time. [0003] At present, research on heat-resistant and high-formability magnesium alloys at home and abroad is mainly concentrated on Mg-Al alloys, which account for more than 90% of the total die-casting magnesium alloys. However, the main strengthening phase b-Mg in the alloy structure of...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C23/06
Inventor 戚文军黄正华徐静李涛周楠蔡畅
Owner GUANGDONG INST OF NEW MATERIALS
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