High-strength and high-hardness aluminum alloy and preparation method thereof

An aluminum alloy, high-hardness technology, applied in the field of high-strength aluminum alloy, can solve the problems of brittle cracking of valve body, cracking and brittle fracture of parts, high brittleness, etc., and achieve the improvement of strength and hardness, enhanced alloy strength, and high heat treatability Effect

Inactive Publication Date: 2013-05-15
GUIZHOU ALUMINUM MATERIALS ENG TECHRES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Coarse intergranular strengthening phases remain without complete solid solution during heat treatment, and it is also easy to cause cracking and brittle fracture of parts under stress
Such as the ZAlSi8Cu1Mg (ZL106) aluminum alloy metal molded valve body, the parts cracked when the screws were tightened in the old assembly road after machining, and the fracture was crystalline and brittle, and no casting defects such as looseness and inclusions were found, but in Intergranular distribution and coarse Al are found in the microstructure 2 Cu phase, due to Al 2 The Cu phase has high hardness (531HV) and high brittleness. During the assembly process of the valve body, it is subjected to the expansion stress of screw tightening, resulting in brittle cracking of the valve body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-strength aluminum alloy, by mass percentage, including 0.4% Si, 0.7% Fe, 0.15% Cu, 0.15% Mn, 0.04% Cr, 0.8% Mg, 0.25% Zn, 0.15% Ti, 0.9% Co, 0.55% C, 1.34% Sr, the balance is Al and unavoidable impurities, the content of each impurity does not exceed 0.05% of the total mass percentage, and the content of all impurities does not exceed the total mass 0.15% of the percentage.

[0028] The invention also provides a method for preparing the high-strength aluminum alloy, adding CoC 3 and SrH 2 , including the following steps:

[0029] Step 1: First add aluminum ingots or molten aluminum liquid into the melting furnace, heat it to melt it completely,

[0030] Step 2: Prepare materials according to the components of the high-strength aluminum alloy, adding 0.4% Si, 0.7% Fe, 0.15% Cu, 0.15% Mn, 0.04% Cr, 0.8% Mg, 0.25% Zn, 0.15% Ti, make it completely dissolved and melted,

[0031] Step 3: heat preservation at 700-1000°C after refining to obtain alloy melt; the melt...

Embodiment 2

[0036] A high-strength aluminum alloy, by mass percentage, including 0.6% Si, 0.5% Fe, 0.25% Cu, 0.1% Mn, 0.15% Cr, 1.0% Mg, 0.2% Zn, 0.1% Ti, 1.2% Co, 0.74% C, 1.79% Sr, the balance is Al and unavoidable impurities, the content of each impurity does not exceed 0.05% of the total mass percentage, and the content of all impurities does not exceed the total mass 0.15% of the percentage.

[0037] The invention also provides a method for preparing the high-strength aluminum alloy, adding CoC 3 and SrH 2 , including the following steps:

[0038] Step 1: First add aluminum ingots or molten aluminum liquid into the melting furnace, heat it to melt it completely,

[0039] Step 2: Prepare materials according to the components of the high-strength aluminum alloy, adding 0.6% Si, 0.5% Fe, 0.25% Cu, 0.1% Mn, 0.15% Cr, 1.0% Mg, 0.2% Zn, 0.1% Ti, make it completely dissolved and melted,

[0040] Step 3: heat preservation at 700-1000°C after refining to obtain alloy melt; the melting pr...

Embodiment 3

[0045] A high-strength aluminum alloy, in terms of mass percentage, including 0.8% Si, 0.5% Fe, 0.4% Cu, 0.09% Mn, 0.35% Cr, 1.2% Mg, 0.1% Zn, 0.06% Ti, 1.5% Co, 0.92% C, 2.24% Sr, the balance is Al and unavoidable impurities, the content of each impurity does not exceed 0.05% of the total mass percentage, and the content of all impurities does not exceed the total mass 0.15% of the percentage.

[0046] The invention also provides a method for preparing the high-strength aluminum alloy, adding CoC 3 and SrH 2 , including the following steps:

[0047] Step 1: First add aluminum ingots or molten aluminum liquid into the melting furnace, heat it to melt it completely,

[0048] Step 2: Prepare materials according to the components of the high-strength aluminum alloy, adding 0.8% Si, 0.5% Fe, 0.4% Cu, 0.09% Mn, 0.35% Cr, 1.2% Mg, 0.1% Zn, 0.06% Ti, make it completely dissolved and melted,

[0049] Step 3: heat preservation at 700-1000°C after refining to obtain alloy melt; the...

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Abstract

The invention discloses a high-strength and high-hardness aluminum alloy and a preparation method thereof. The preparation method comprises the following steps: heating aluminum ingots or completely melting aluminum liquid; adding Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti and C to completely dissolve and melt; refining, and keeping the temperature at 700-1000 DEG C to obtain alloy melt; degassing and purifying the alloy melt by using nitrogen or inert gas or a mixed gas of nitrogen and inert gas according to an any proportion, and continuously injecting the gas to the end of the reaction; adding CoC3 and SrH2 powder in the alloy melt along with the gas in a fluidized manner; stirring to ensure that CoC3 and SrH2 are evenly distributed in the alloy melt and fully react with the alloy melt; and standing, adjusting the temperature to 680-730 DEG C, discharging alloy liquid and performing casting production. By adopting the preparation method, the performance defects of the aluminum alloy can be overcome, the obdurability, formability and hardenability of the alloy can be increased and high-grade base material can be provided for efficient deep processing.

Description

technical field [0001] The invention relates to a high-strength aluminum alloy and a preparation method thereof. Background technique [0002] The size and distribution of strengthening phase and impurity phase in cast aluminum alloy have a significant impact on the mechanical properties and strengthening effect of the alloy. It is generally hoped that the strengthening phase is finely distributed and evenly distributed, and fully solid solution and aging strengthening are obtained through heat treatment, while harmful impurities are minimized and refined. The existence of coarse brittle phase is very harmful. For example, the coarse needle-like phase β(Al 9 Si 2 Fe 2 ) phase, and the flaky eutectic silicon in the unmodified Al-Si-Cu alloy, etc., when the stress deforms during use, it is easy to cause microcracks in the brittle phase. [0003] Coarse intergranular strengthening phases remain without complete solid solution during heat treatment, and it is also easy to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/02C22C1/06
Inventor 张中可门三泉车云
Owner GUIZHOU ALUMINUM MATERIALS ENG TECHRES CENT
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