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Zr and Sr compound microalloyed and Mn microalloyed high toughness Al-Si-Cu serial cast aluminum alloy and preparation method thereof

A technology for casting aluminum alloy and micro-alloying, which is applied in the field of new high-strength and tough Al-Si-Cu series cast aluminum alloy and its preparation, can solve the problems of reducing alloy casting performance, low plasticity and toughness, etc. The effect of dense tissue

Inactive Publication Date: 2017-11-10
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low plasticity and toughness of the current Al-Si(-Cu) cast aluminum alloy, and to invent a method based on the composition design of the Al-Si-Cu cast aluminum alloy, by adjusting the Si and Cu elements Content, at the same time adding trace zirconium (Zr), strontium (Sr) and a small amount of manganese (Mn) elements for composite alloying, without reducing the casting performance of the alloy, at the same time, the Si phase and compound phase in the alloy are efficiently refined, and the alloy phase is greatly improved. plasticity and toughness, to obtain an Al-Si-Cu cast aluminum alloy with excellent casting performance and toughness, and to provide its preparation method at the same time

Method used

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  • Zr and Sr compound microalloyed and Mn microalloyed high toughness Al-Si-Cu serial cast aluminum alloy and preparation method thereof
  • Zr and Sr compound microalloyed and Mn microalloyed high toughness Al-Si-Cu serial cast aluminum alloy and preparation method thereof
  • Zr and Sr compound microalloyed and Mn microalloyed high toughness Al-Si-Cu serial cast aluminum alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 , 2 , 3, 4 shown.

[0032] A Zr, Sr composite microalloying and Mn alloying high strength and toughness Al-Si-Cu cast aluminum alloy, its preparation method:

[0033]First melt A00 grade pure Al (99.79%Al, 0.14%Fe, 0.04%Si) and Al-Si (89.62%Al, 10.21%Si, 0.17%Fe) master alloy, then heat up to 850±10℃, and then add Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) master alloy, Al-Mn (89.73% Al, 10.02%Mn, 0.19%Fe, 0.06%Si ) master alloy, Al-Zr ( 95.69%Al, 4.11%Zr, 0.20% Fe, 0.10%Si ) master alloy and Al-Sr(89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy; after all master alloys and metals are melted Adjust the temperature to 750±10°C, add hexachloroethane for refining and degassing until no gas escapes, let it stand for 5-10 minutes, then remove the slag and pour it into a metal mold preheated to 300±10°C to cast an ingot; That is, a high-strength and tough Al-Si-Cu cast aluminum alloy with Zr, Sr composite microalloying and Mn alloying is obtained. ...

Embodiment 2

[0037] A Zr, Sr composite microalloying and Mn alloying high strength and toughness Al-Si-Cu cast aluminum alloy, its preparation method:

[0038] First melt A00 grade pure Al (99.79%Al, 0.14%Fe, 0.04%Si) and Al-Si (89.62%Al, 10.21%Si, 0.17%Fe) master alloy, then heat up to 850±10℃, and then add Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) master alloy, Al-Mn (89.73%Al, 10.02%Mn, 0.19%Fe, 0.06%Si ) master alloy, Al-Zr ( 95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si ) master alloy and Al-Sr(89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy; after all master alloys and metals are melted Adjust the temperature to 750±10°C, add hexachloroethane for refining and degassing until no gas escapes, let it stand for 5-10 minutes, then remove the slag and pour it into a metal mold preheated to 300±10°C to cast an ingot; That is, a high-strength and tough Al-Si-Cu cast aluminum alloy with Zr, Sr composite microalloying and Mn alloying is obtained.

[0039] The composition of the Zr, Sr composite...

Embodiment 3

[0042] A Zr, Sr composite microalloying and Mn alloying high strength and toughness Al-Si-Cu cast aluminum alloy, its preparation method:

[0043] First melt A00 grade pure Al (99.79%Al, 0.14%Fe, 0.04%Si) and Al-Si (89.62%Al, 10.21%Si, 0.17%Fe) master alloy, then heat up to 850±10℃, and then add Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) master alloy, Al-Mn (89.73% Al, 10.02%Mn, 0.19%Fe, 0.06%Si ) master alloy, Al-Zr ( 95.69%Al, 4.11%Zr, 0.20% Fe, 0.10%Si ) master alloy and Al-Sr(89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy; after all master alloys and metals are melted Adjust the temperature to 750±10°C, add hexachloroethane for refining and degassing until no gas escapes, let it stand for 5-10 minutes, then remove the slag and pour it into a metal mold preheated to 300±10°C to cast an ingot; That is, a high-strength and tough Al-Si-Cu cast aluminum alloy with Zr, Sr composite microalloying and Mn alloying is obtained.

[0044] The composition of the Zr, Sr composi...

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Abstract

A Zr, Sr composite micro-alloyed and Mn-alloyed high-strength Al-Si-Cu cast aluminum alloy and a preparation method thereof, characterized in that the aluminum alloy is mainly composed of aluminum, silicon, copper, manganese, magnesium, Composed of zinc, zirconium, strontium and iron, wherein the mass percentage of silicon (Si) is 8.28-8.41%, the mass percentage of copper is 2.06-2.29%, the mass percentage of manganese is 0.472-0.483%, and the mass percentage of zirconium is 0.187 ~0.192%, the mass percentage of strontium is 0.0334~0.0378%, the mass percentage of iron is 0.142~0.147%, and the balance is aluminum and a small amount of impurity elements. The as-cast structure of the aluminum alloy of the present invention is dense, and the average value of the unnotched impact toughness at room temperature measured by the as-cast alloy is 18.386366 J / cm2, and its tensile strength is 238.85 MPa, elongation is 7.06%, and the temperature is 37 ° C in 3.5% NaCl aqueous solution. The average uniform corrosion rate is 0.324870443 mm / y, which can meet the manufacturing needs of large complex thin-walled high-strength cast aluminum alloy structural parts.

Description

technical field [0001] The present invention relates to an aluminum alloy material and a preparation method thereof, especially a novel high-strength and toughness Al-Si-Cu cast aluminum alloy and a preparation method thereof, specifically a Zr, Sr composite microalloying and Mn alloy A high-strength and toughness Al-Si-Cu cast aluminum alloy and a preparation method thereof. Background technique [0002] Al-Si (-Cu) series cast aluminum alloy is currently the most widely used cast aluminum alloy material in the industry. The numbers of this type of alloy are: domestic YL102 (AlSi12), YL112 (AlSi8.5Cu3.5), YL113 (AlSi811Cu3 ), Japan's ADC12 (AlSi11Cu3), ADC10 (AlSi8.5Cu3.5) and American A380 (AlSi8.5Cu3.5), etc. These alloys have excellent casting properties, high strength and good corrosion resistance, but Its plasticity and toughness are relatively low, which limits its application. [0003] It is well known that the mechanical properties of Al-Si (-Cu) cast aluminum all...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/03C22C1/06
CPCC22C21/02C22C1/026C22C1/03C22C1/06
Inventor 许晓静陈汉辉陈瑞芳张进松王天伦黄鹏张冲杜东辉贾伟杰
Owner JIANGSU UNIV
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