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A high-strength and high-toughness hypoeutectic aluminum-silicon casting alloy and its preparation method

A casting alloy, high-strength and high-toughness technology, which is applied in the field of non-ferrous metal materials, can solve the problems of alloy mechanical properties limitation, poisoned Ti refinement effect, etc., and achieve the effect of improving mechanical properties, improving refinement modification effect, and improving dispersion strengthening effect

Active Publication Date: 2020-06-16
JIANGXI JINLI CITY MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present disclosed Sc, Ti, Sr (Chinese patent application publication number CN105838937A) and Al-5Ti-1B-Sc (Chinese patent application publication number CN103589916A), and Sr, Ti (Chinese patent application publication number CN105525159A) to Asia In the refinement and modification treatment method of crystalline Al-Si-Mg alloy (A357), because Ti in the refiner easily forms titanium silicide with Si in the hypoeutectic Al-Si alloy, which poisons the refinement effect of Ti, thus, Sc , Ti compound refinement treatment or Ti refinement treatment to improve the mechanical properties of the alloy is limited

Method used

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  • A high-strength and high-toughness hypoeutectic aluminum-silicon casting alloy and its preparation method
  • A high-strength and high-toughness hypoeutectic aluminum-silicon casting alloy and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Select Al-20Si, Al-3Be, Al-10Sr, Al-2Sc, Al-5Zr master alloys and pure aluminum, pure magnesium, pure copper as raw materials, according to the chemical composition (mass fraction) of the casting alloy of the present invention Si: 6.8%, Mg: 0.6%, Cu: 0.1%, Be: 0.05%, Sc: 0.2%, Zr: 0.2%, Sr: 0.03%, Fe≤0.1%, and the balance is Al ingredients.

[0026](2) Use resistance furnace and graphite clay crucible for smelting; after drying the prepared alloy raw materials, pure aluminum and Al-20Si, put them into a preheated graphite clay crucible and heat and melt with the furnace; the melt temperature is 690-700℃, and the Heat a graphite bell jar at 300°C and press pure magnesium into it. At 720°C, add pure copper and Al-3Be master alloy and stir evenly for 2-3 minutes.

[0027] (3) When the alloy melt temperature is 730-740°C, use a graphite bell jar preheated to 300°C to press into the aluminum foil-wrapped Cl 6 C 2 Carry out the first refining, the temperature of the mel...

Embodiment 2

[0033] (1) Select Al-20Si, Al-10Sr, Al-2Sc, Al-5Zr master alloys and pure aluminum, pure magnesium, pure copper as raw materials, according to the chemical composition (mass fraction) of the cast alloy of the present invention Si: 6.8%, Mg : 0.6%, Cu: 0.15%, Be: 0.06%, Sr: 0.04%, Sc: 0.3%, Zr: 0.3%, Fe≤0.1%, and the balance is Al ingredients.

[0034] The alloy smelting, the preparation of the alloy sample, and the performance test are all consistent with Example 1. The tensile strength of the alloy sample after heat treatment is 350.3MPa, and the elongation is 6.0%.

Embodiment 3

[0035] Embodiment 3: heat treatment process embodiment.

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Abstract

The invention discloses a high-strength and high-toughness hypoeutectic aluminum-silica casting alloy and a preparation method thereof. The alloy comprises the chemical compositions of, by mass, 6.5-7.0% of Si, 0.45-0.65% of Mg, 0.1-0.15% of Cu, 0.05-0.06% of Be, 0.2-0.3% of Sc, 0.2-0.3% of Zr, 0.02-0.04% of Sr, no more than 0.1% of Fe, and the balance Al; after being subjected to Sc, Zr and Sr complex refinement modification treatment, 545-548 DEG C*12h solid solution and two-stage aging (120-130 DEG C*4 h low-temperature pre-aging, 170-175 DEG C*5-6 h final aging) heat treatment, the tensilestrength of the alloy reaches 366 MPa, the elongation rate is 6.5%, and compared with a commercial alloy A357 with equal components, the tensile strength and the elongation rate of the casting alloyare greatly improved.

Description

technical field [0001] The invention relates to a high-strength and high-toughness Al-Si-Mg-Cu-Be-Sc-Zr-Sr casting alloy and a refinement modification and heat treatment method thereof, belonging to the technical field of non-ferrous metal materials. Background technique [0002] Al-Si-Mg hypoeutectic aluminum-silicon casting alloys, such as A356 and A357, are widely used in the fields of machinery, automobiles, aerospace and military because of their good casting and mechanical properties. At present, most domestic A357 production enterprises are difficult to meet the performance standard of the alloy (tensile strength 320MPa, elongation 5%) due to the problem of preparation process; in addition, the application field has great influence on the mechanical properties of the hypoeutectic aluminum-silicon casting alloy and the thin-walled and lightweight components. The requirements are increasing day by day, which urgently needs to improve the properties of A356 and A357 allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C1/03C22F1/043
CPCC22C1/026C22C1/03C22C21/04C22F1/043
Inventor 章爱生黄伟民解协成
Owner JIANGXI JINLI CITY MINING CO LTD
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