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High-strength and high-plasticity magnesium alloy

A magnesium alloy, high-strength technology, applied in the field of non-ferrous metals, can solve problems such as inability, low elongation, complex alloy preparation methods, etc.

Active Publication Date: 2015-02-04
CHONGQING ACADEMY OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The absolute strength of ordinary magnesium alloy (the current commercial high-strength magnesium alloy material Mg-Zn-Zr alloy, its typical alloy grade such as ZK60, the alloy tensile strength is only 340MPa) is 100-350Mpa, far lower than the 1000Mpa of steel and aluminum alloy 600Mpa, which seriously affects the scope of use of magnesium alloys
For this reason, many material workers have carried out research in order to obtain magnesium alloy materials with tensile strength exceeding 400MPa and elongation exceeding 5%; 200710078329.X) has a high elongation (≥10%), but the tensile strength is still low (≤360MPa); Y.Kawamura et al published in the Journal of Materials-Volume 42, Issue 7, pp. 1172~1176 The article "Rapidly solidified powder metallurgy Mg 97 Zn 1 Y 2 Alloys with excellenttensile yield strength above600MPa" discloses a kind of Mg prepared by rapid cooling and powder metallurgy (RS P / M) technology 97 Zn 1 Y 2 Magnesium alloy, although the strength of this magnesium alloy is as high as 610MPa, the elongation is still not high (about 5%), and the preparation method of this alloy is complicated, which cannot be applied in actual production

Method used

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  • High-strength and high-plasticity magnesium alloy

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Experimental program
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Embodiment 1

[0023] In this embodiment, the magnesium alloy is composed of the following components by mass: Ni: 4.03%; Y: 4.74%; Zr: 0.03%; unavoidable impurities are about 0.15%, of which Al 0.02%, Si 0.02%, Cu 0.01%, Fe 0.02%.

[0024] The method for preparing a high-strength and high-plasticity magnesium alloy in this embodiment comprises the following steps:

[0025] 1), material selection: select raw materials according to the above mass ratio, the selected raw materials for this implementation are industrial pure magnesium ingots, industrial pure zirconium, Mg-40%Y master alloy and Mg-30%Ni master alloy;

[0026] 2) Smelting: First, heat industrial pure magnesium to 700°C in a resistance crucible boiler, and after the masterbatch is completely melted, heat up to 750°C for slag removal; then add zirconium ingots and Mg-40%Y master alloy into the crucible and Mg-30%Ni intermediate alloy, stir for 2 to 5 minutes after they are completely melted, and keep the temperature for 15 minutes...

Embodiment 2

[0032] In this embodiment, the magnesium alloy is composed of the following components by mass: Ni: 3.54%; Y: 5.08%; Zr: 0.01%; unavoidable impurities 0.15%, the rest is magnesium, of which Al 0.01%, Si 0.03 %, Cu 0.02%, Fe 0.02%.

[0033] The method for preparing a high-strength and high-plasticity magnesium alloy in this embodiment comprises the following steps:

[0034] 1), material selection: select raw materials according to the above mass ratio, the selected raw materials for this implementation are industrial pure magnesium ingots, industrial pure zirconium, Mg-40%Y master alloy and Mg-30%Ni master alloy;

[0035] 2) Smelting: First, heat industrial pure magnesium to 700°C in a resistance crucible boiler, and after the masterbatch is completely melted, heat up to 750°C for slag removal; then add zirconium ingots and Mg-40%Y master alloy into the crucible and Mg-30%Ni intermediate alloy, stir for 2 to 5 minutes after they are completely melted, and keep the temperature ...

Embodiment 3

[0041] The following examples will disclose a high-strength and high-plasticity magnesium alloy, which is composed of the following components by mass: Ni: 3.0%; Y: 5.0%; Zr: 0.01%; unavoidable impurities 0.12%; the rest is magnesium; Al 0.02%, Si 0.02%, Cu 0.02%, Fe 0.03%.

[0042] The method for preparing a high-strength and high-plasticity magnesium alloy in this embodiment comprises the following steps:

[0043] 1), material selection: select raw materials according to the above mass ratio, the selected raw materials for this implementation are industrial pure magnesium ingots, industrial pure zirconium, Mg-40%Y master alloy and Mg-30%Ni master alloy;

[0044]2) Smelting: First, heat industrial pure magnesium to 700°C in a resistance crucible boiler, and after the masterbatch is completely melted, heat up to 750°C for slag removal; then add zirconium ingots and Mg-40%Y master alloy into the crucible and Mg-30%Ni intermediate alloy, stir for 2 to 5 minutes after they are c...

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Abstract

The invention discloses a high-strength and high-plasticity magnesium alloy. The high-strength and high-plasticity magnesium alloy comprises the following components in percentage by mass: 3.0-4.5% of Ni, 4.0-5.0% of Y, 0.01-0.1% of Zr, not more than 0.15% of inevitable impurities and the balance of magnesium. According to the high-strength and high-plasticity magnesium alloy disclosed by the invention, Y and Ni elements are simultaneously added into a magnesium matrix, and in the smelting and molding process of the alloy, Y and Ni form Mg2Ni and Mg12YNi phases with the magnesium matrix, wherein the Mg12YNi phase is a long-period stacking ordered structure (LPSO), so that the strength of the alloy can be improved, and the plasticity of the alloy can also be improved; and Mg2Ni can improve the strength of the alloy by a strengthening mechanism of the second phase. According to the high-strength and high-plasticity magnesium alloy disclosed by the invention, an appropriate amount of Zr element is further added into the alloy, and zirconium can be dispersed and distributed in the matrix in an elemental form by controlling the smelting and molding process to play a role in refining grains.

Description

technical field [0001] The invention belongs to the field of nonferrous metals and relates to a novel magnesium alloy, in particular to a magnesium alloy with excellent strength and plasticity. Background technique [0002] Magnesium alloy is one of the lightest metal structural materials with low density (1.74g / cm 3 ), high specific strength and specific stiffness, excellent vibration damping performance, abundant reserves, and easy recycling. It has attracted the attention of material workers and is known as "the most important green engineering metal structure material in the 21st century". It is widely used in the fields of electronics, electrical appliances and aerospace. [0003] Low strength is the key to restricting the popularization and application of magnesium alloys. The absolute strength of ordinary magnesium alloy (the current commercial high-strength magnesium alloy material Mg-Zn-Zr alloy, its typical alloy grade such as ZK60, the alloy tensile strength is ...

Claims

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Application Information

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IPC IPC(8): C22C23/06
CPCC22C23/06
Inventor 罗素琴潘复生汤爱涛蒋斌杜维唯刘文君程仁菊董含武
Owner CHONGQING ACADEMY OF SCI & TECH
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