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Sr-Zr-Ti ternary composite microalloyed Al-Si-Cu line cast aluminium alloy and preparation method

A technology for casting aluminum alloy and al-si-cu is applied in the field of aluminum alloy materials and their preparation to achieve the effects of improving strength, hardness, elongation and hardness.

Active Publication Date: 2019-12-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there is no high-strength and high-hardness Al-Si-Cu cast aluminum alloy with independent intellectual property rights of Sr, Zr, Ti ternary composite micro-alloying and its preparation method available for use.

Method used

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  • Sr-Zr-Ti ternary composite microalloyed Al-Si-Cu line cast aluminium alloy and preparation method
  • Sr-Zr-Ti ternary composite microalloyed Al-Si-Cu line cast aluminium alloy and preparation method
  • Sr-Zr-Ti ternary composite microalloyed Al-Si-Cu line cast aluminium alloy and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 , 2 shown.

[0030] A Sr, Zr, Ti ternary composite micro-alloyed high-strength and high-hardness Al-Si-Cu cast aluminum alloy, which is prepared by the following method:

[0031] First, put pure Al, Al-Si master alloy and Al-Cu master alloy in a resistance wire melting furnace and heat up to 850±10°C, then add Al-Sr master alloy, Al-Zr master alloy and Al- Ti-B master alloy. Next, keep warm for 1.5~2h. After all the intermediate alloys and metals are melted, adjust the temperature to 760±10°C, add hexachloroethane once to degas until no gas escapes, let it stand for 15 minutes, and then add hexachloroethane The alkane is degassed twice until no gas escapes, and after standing for 15 minutes, the slag is removed and poured into a metal mold preheated to 400±10°C to cast an ingot. Finally, 250±10℃×6h+350±10℃×6h+450±10℃×6h+480±10℃×6h for homogenization annealing, 480±10℃×1h+490±10℃×1h for solid solution , Quenching in warm water at 60±5°C, aging treat...

Embodiment 2

[0035] A Sr, Zr, Ti ternary composite micro-alloyed high-strength and high-hardness Al-Si-Cu cast aluminum alloy, which is prepared by the following steps:

[0036] First, put pure Al, Al-Si master alloy and Al-Cu master alloy in a resistance wire melting furnace and heat up to 850±10°C, then add Al-Sr master alloy, Al-Zr master alloy and Al- Ti-B master alloy. Next, keep warm for 1.5~2h. After all the intermediate alloys and metals are melted, adjust the temperature to 760±10°C, add hexachloroethane once to degas until no gas escapes, let it stand for 15 minutes, and then add hexachloroethane The alkane is degassed twice until no gas escapes, and after standing for 15 minutes, the slag is removed and poured into a metal mold preheated to 400±10°C to cast an ingot. Finally, 250±10℃×6h+350±10℃×6h+450±10℃×6h+480±10℃×6h for homogenization annealing, 480±10℃×1h+490±10℃×1h for solid solution Treatment, quenching in warm water at 60±5°C, aging treatment at 191±10°C×12h, and coolin...

Embodiment 3

[0040] The preparation method of the third example is the same as that of the first and second examples, except that the high-strength and high-hardness Al-Si-Cu cast aluminum alloy of this example is subjected to EDS The actual measured composition is: 8.57%Si, 5.32%Cu, 0.55%Sr, 0.62%Zr, 0.19%Ti, and the balance is aluminum and impurity elements. The high-strength and high-hardness Al-Si-Cu cast aluminum alloy of the present example is composed of Sr, Zr, and Ti ternary composite micro-alloys. The structure is dense, the Si phase is fine, and the shape is granular or short. The fracture rate is 4.8%. The fracture is a typical ductile fracture with dimple characteristics.

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Abstract

The invention relates to an Sr-Zr-Ti ternary composite microalloyed high-strength high-rigidity Al-Si-Cu line cast aluminium alloy. The cast aluminium alloy is characterized by being mainly composed of Al, Si, Cu, Sr, Zr and Ti. A preparation method comprises the steps of 1, smelting; 2, impurity removal and casting; 3, homogenization annealing, solid solution, quenching and ageing. The strength of the Sr-Zr-Ti ternary composite microalloyed Al-Si-Cu line cast aluminium alloy is 334.347-371.884 MPa, the elongation percentage of the cast aluminium alloy is 4.3-5.25%, the fracture is a typical ductile fracture in a dimple characteristic, and the rigidity is 137.6-144.1 HV. Compared with single compounds of Al3Ti and Al3Zr, the cast aluminium alloy has a better microalloying function, the alloy casting performance is not lowered, the compact alloy structure is guaranteed, the Si phase and the compound phase in the alloy are efficiently refined, and the strength and plasticity of the castaluminium alloy are effectively improved.

Description

technical field [0001] The present invention relates to an aluminum alloy material and a preparation method thereof, in particular to a ternary composite aluminum alloy technology, specifically a high-strength, high-hardness Al-Si- Cu-based cast aluminum alloy and a preparation method thereof. Background technique [0002] Al-Si-Cu cast aluminum alloy has high tensile strength and elongation, relatively good casting performance and corrosion resistance, and is widely used in various fields of industrial manufacturing, such as automobiles, aerospace and other fields. With the rapid increase in the number of automobiles, the continuous improvement of automobile performance, and the increasingly prominent energy resource issues, the automobile industry has increasingly stringent requirements for lightweight and high-strength products. Improving the mechanical properties of cast aluminum alloys has become an urgent need in today's society. solved problem. [0003] It is well k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03C22F1/043
CPCC22C1/026C22C1/03C22C21/04C22F1/043
Inventor 许晓静庄园陈士安骆建军张斌刘正张日凯金啸鹏张鹏韦宏博
Owner JIANGSU UNIV
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