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Zr and Sr compound microalloyed high-strength/toughness corrosion resisting Al-Si-Cu cast aluminum alloy and preparation method

A casting aluminum alloy and micro-alloying technology, which is applied in the field of aluminum alloy materials and its preparation, can solve the problems of reducing alloy casting performance, plasticity, and low toughness, and achieve the goal of improving toughness, increasing elongation, and ensuring the compactness of alloy structure Effect

Inactive Publication Date: 2017-12-08
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
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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 Si, Cu Element content, at the same time adding trace amounts of strontium (Sr) and zirconium (Zr) elements for composite microalloying, without reducing the casting performance (fluidity) 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 high strength, toughness and corrosion resistance, and to provide its preparation method

Method used

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  • Zr and Sr compound microalloyed high-strength/toughness corrosion resisting Al-Si-Cu cast aluminum alloy and preparation method
  • Zr and Sr compound microalloyed high-strength/toughness corrosion resisting Al-Si-Cu cast aluminum alloy and preparation method
  • Zr and Sr compound microalloyed high-strength/toughness corrosion resisting Al-Si-Cu cast aluminum alloy and preparation method

Examples

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Effect test

Embodiment 1

[0031] like figure 1 , 2 , 3, 4, and 5.

[0032] A Zr and Sr composite micro-alloyed high-strength, toughness, corrosion-resistant Al-Si-Cu series cast aluminum alloy, its preparation method:

[0033] Take 1Kg as an example

[0034]First, 0.833Kg Al-Si (89.62%Al, 10.21%Si, 0.17%Fe, all components of the present invention are represented by mass percentage, the same below, all components added to less than 100% are impurities) master alloy (The loss rate of Si is about 5%) After melting, the temperature is raised to 850°C, and then 0.0431Kg Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) intermediate alloy (the loss rate of Cu is about 6.25%), 0.0489Kg Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si ) master alloy (the loss rate of Zr is about 8%), 0.0141Kg Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy (the loss rate of Sr is about 75%) and 0.0609Kg A00 grade pure Al (99.79%Al, 0.14%Fe, 0.04%Si); After the metal is melted, adjust the temperature to 750°C, add hexachlo...

Embodiment 2

[0038] A Zr and Sr composite micro-alloyed high-strength, toughness, corrosion-resistant Al-Si-Cu series cast aluminum alloy, its preparation method:

[0039] Take 1kg as an example.

[0040] First melt 0.819Kg Al-Si (89.62%Al, 10.21%Si, 0.17%Fe) master alloy and then raise the temperature to 850±10℃, then add 0.0424Kg Al-Cu (49.62%Al, 50.12%Cu,0.15% Fe, 0.11%Si ) master alloy (the loss rate of Cu is about 6.25%), 0.0476Kg Al-Zr (95.69%Al, 4.11%Zr,0.20%Fe, 0.10%Si ) master alloy (the loss rate of Zr is about 8%), 0.0133Kg Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy (the loss rate of Sr is about 75%) and 0.0777Kg A00 grade pure Al (99.79%Al, 0.14%Fe, 0.04%Si); after all the intermediate alloys and metals are melted, adjust the temperature to 750±10°C, add hexachloroethane for refining and degassing until no gas escapes, leave it for 5-10 minutes to remove the slag and pouring into a metal mold preheated to 300±10° C. to cast an ingot; namely, a Zr and Sr composi...

Embodiment 3

[0044] A Zr and Sr composite micro-alloyed high-strength, toughness, corrosion-resistant Al-Si-Cu series cast aluminum alloy, its preparation method:

[0045] Take 1Kg as an example

[0046] First melt 0.828Kg Al-Si (89.62%Al, 10.21%Si, 0.17%Fe) master alloy (the loss rate of Si is about 5%) and then raise the temperature to 850±10℃, then add 0.0447Kg Al-Cu( 49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) master alloy (the loss rate of Cu is about 6.25%), 0.045Kg Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si ) master alloy (the loss rate of Zr is about 8%), 0.0105Kg Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy (the loss rate of Sr is about 75%) and 0.0718 Kg A00 grade pure Al (99.79%Al, 0.14%Fe, 0.04%Si); after all the master alloys and metals are melted, adjust the temperature to 750±10℃, add hexachloroethane for refining and degassing until no gas escapes, After standing for 5 to 10 minutes, remove the slag and pour it into a metal mold preheated to 300±10°C to cast an in...

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Abstract

A Zr and Sr composite microalloyed high-strength, toughness, corrosion-resistant Al-Si-Cu cast aluminum alloy and a preparation method thereof, characterized in that the aluminum alloy is mainly composed of aluminum (Al), silicon (Si), copper ( Cu), zirconium (Zr), strontium (Sr) and iron (Fe), the mass percentage of silicon (Si) is 7.9-8.18%, the mass percentage of copper (Cu) is 1.95-2.11%, and the mass percentage of zirconium (Zr) The mass percentage is 0.169-0.187%, the mass percentage of strontium (Sr) is 0.0253-0.035%, the mass percentage of iron (Fe) is 0.133-0.153%, and the balance is aluminum and a small amount of impurity elements. The aluminum alloy of the present invention has a dense as-cast structure, and the measured impact toughness at room temperature of the as-cast alloy is 24.151438~39.312583 J / cm2, while its tensile strength is 217.228~234.7 MPa, elongation is 9~9.529%, and 37% in 3.5% NaCl aqueous solution The uniform corrosion rate at ℃ temperature is 0.239345219~0.27074376 mm / y, which can meet the manufacturing needs of large complex thin-walled high-strength and corrosion-resistant cast aluminum alloy structural parts.

Description

technical field [0001] The invention relates to an aluminum alloy material and a preparation method thereof, in particular to a high-strength, toughness, and corrosion-resistant Al-Si-Cu series cast aluminum alloy and a preparation method thereof, in particular to a high-strength alloyed Zr and Sr composite microalloy Tough and corrosion-resistant 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 grades of this type of aluminum 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. [0003] The mechanical properties of Al-Si (-Cu) cast aluminum alloys are cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03
CPCC22C21/04C22C1/026C22C1/03
Inventor 许晓静贾伟杰张福豹杜东辉张冲黄鹏王天伦张进松陈汉辉
Owner JIANGSU UNIV
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