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Quasicrystal reinforced magnesium alloy and semisolid preparation method thereof

A technology for strengthening magnesium alloys and quasicrystals, which is applied in the field of quasicrystal reinforced magnesium alloys and their semi-solid preparation, can solve the problems of unsuitable magnesium alloy parts preparation and industrial production, etc., and achieves improved comprehensive mechanical properties, simple process and finished products. high rate effect

Inactive Publication Date: 2010-05-26
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of quasicrystals of high-strength magnesium alloys mainly adopts methods such as powder metallurgy, hot rolling, and hot extrusion, but the above methods are generally only suitable for the preparation of bars and profiles, and are not suitable for the production of magnesium alloy parts with more complex shapes. Preparation and industrial production

Method used

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  • Quasicrystal reinforced magnesium alloy and semisolid preparation method thereof
  • Quasicrystal reinforced magnesium alloy and semisolid preparation method thereof
  • Quasicrystal reinforced magnesium alloy and semisolid preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Alloy composition (mass percentage): 84.6% Mg, 7.5% Zn, 1.7% Y, 6.2% Al.

[0026] Put pure Mg, Al, Zn and Mg-Y master alloy in the crucible according to the above composition ratio, and start to pass CO2 from 420°C 2 +SF 6 Mix protective gas, when the melt temperature rises to 730°C, refine and stand for 15 minutes, and cast alloy ingots at 700°C; the as-cast microstructure includes α-Mg, I-Phase (quasicrystalline phase), Mg 17 al 12 、Al 2 Y, such as figure 1 As shown, wherein, the volume ratio of I-Phase is 4.1%;

[0027] Extrude the above alloy ingot at 390°C for 2 hours and then extrude it into a bar. The temperature of the extrusion cylinder is 410°C, the temperature of the mold is 350°C, and the extrusion ratio is 13;

[0028] Use the electromagnetic induction heating device to heat the extruded bar to 420°C at a power of 10Kw, turn down the power to 5Kw and continue heating to 560°C for semi-solid die-casting.

[0029] According to the test, the tensile st...

Embodiment 2

[0031] Alloy composition (mass percentage): 78% Mg, 13% Zn, 3.3% Y, 5.7% Al.

[0032] Put pure Mg, Al, Zn and Mg-Y master alloy in the crucible according to the design ratio of the above components and heat it, start to pass CO2 from 420℃ 2 +SF 6 Mixed gas protection, when the melt temperature rises to 730 ° C, refining and standing for 15 minutes, cast alloy ingots at 700 ° C; its as-cast microstructure includes α-Mg, I-Phase (quasicrystalline phase), Mg 17 al 12 、Al 2 Y, such as figure 2 As shown, wherein, the volume ratio of I-Phase is 8.3%;

[0033] The alloy ingot was kept at 390°C for 2 hours and then extruded into rods. The temperature of the extrusion cylinder was 410°C, the temperature of the mold was 350°C, and the extrusion ratio was 13;

[0034] Use the electromagnetic induction heating device to heat the extruded bar to 420°C at a power of 10Kw, turn down the power to 5Kw and continue heating to 560°C for semi-solid die-casting.

[0035] According to the t...

Embodiment 3

[0037] Alloy composition (mass percentage): 71% Mg, 19% Zn, 4.5% Y, 5.5% Al.

[0038] Put pure Mg, Al, Zn and Mg-Y master alloy in the crucible according to the design ratio of the above components and heat it, and start to pass CO at 420°C 2 +SF 6 Mixed gas protection, when the melt temperature rises to 730 ° C, refining and standing for 15 minutes, cast alloy ingots at 700 ° C; its as-cast microstructure includes α-Mg, I-Phase (quasicrystalline phase), Mg 17 al 12 、Al 2 Y, such as image 3 As shown, wherein, the volume ratio of I-Phase is 11.8%;

[0039] The alloy ingot is kept at 390°C for 2 hours and then extruded into rods. The temperature of the extrusion cylinder is 410°C, the temperature of the mold is 350°C, and the extrusion ratio is 13;

[0040] Use the electromagnetic induction heating device to heat the extruded bar to 420°C at a power of 10Kw, turn down the power to 5Kw and continue heating to 560°C for semi-solid die-casting.

[0041] The tensile strength...

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Abstract

The invention discloses a quasicrystal reinforced Mg-Zn-Y-Al alloy and a semisolid preparation method thereof, belonging to the industrial magnesium alloy and the manufacturing field thereof. The quasicrystal reinforced magnesium alloy comprises the following components in percentage by weight: 4-15% of Zn, 0.5-3.5% of Y, 3-10% of Al and the balance of Mg. A hot extrusion method is adopted to extrude the Mg-Zn-Y-Al alloy into bars, and an electromagnetic induction heating device is adopted to heat the extrude bar into semisolid to carry out semisolid injection moulding. The fine texture of the quasicrystal reinforced Mg-Zn-Y-Al alloy of the invention contains fine quasicrystal reinforced phase which has favorable interfacial bond strength with a matrix so as to obviously improve the comprehensive mechanical properties of magnesium alloy. The semisolid preparation technology thereof is suitable for producing high-performance magnesium alloy parts with complex shape, is simple, has high yield, energy saving and environment protection, lowers cost and can be widely applied to industrial production.

Description

technical field [0001] The invention relates to the field of industrial high-strength magnesium alloy and its manufacture, in particular to a quasi-crystal reinforced magnesium alloy and a semi-solid preparation method thereof. Background technique [0002] Due to its low density, high specific strength, good noise reduction and vibration reduction, good electromagnetic shielding, easy recycling and other advantages, magnesium alloy has very broad application prospects in aerospace, transportation vehicles, electronic communications, national defense technology and other fields. Especially with the increasing requirements for light weight, energy saving, environmental protection and ecological environment of traveling machinery such as automobiles and motorcycles, the application of magnesium alloys in vehicles such as automobiles has attracted more and more attention. Compared with developed countries, my country is a country rich in magnesium resources, and has unique adva...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/00B22D17/00
Inventor 张英波权高峰刘赵铭
Owner DALIAN JIAOTONG UNIVERSITY
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