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Aluminum alloy used for preparing high-strength high-plasticity aluminum matrix composite material and aluminum matrix composite material

A technology of aluminum-based composite materials and composite materials, applied in the field of metal-based composite materials and aluminum alloys, can solve the problems of increased coarsening, reduced phase nucleation rate, large size, etc., and achieve the effect of increased yield strength and good plasticity

Inactive Publication Date: 2017-05-31
中科复材(滨州)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the thermal mismatch and elastic mismatch between the reinforcement phase and the matrix in the composite material, geometrically necessary dislocations are generated. Therefore, the diffusion of Mg and Si elements is accelerated during artificial aging, and the aging precipitation is accelerated, forming a low-density and large-sized β″ phase.
In addition, the annihilation effect of dislocations on vacancies reduces the size of Mg and Si atomic clusters, reduces the nucleation rate of β″ phase during artificial aging, and aggravates its coarsening.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Use Al-Si master alloy ingots containing 20wt.% Si, Al ingots, Mg ingots, and Al-Cu master alloy ingots containing 50wt.% Cu to melt in an aluminum alloy melting furnace. The melting temperature is 750 ° C, and the order of feeding is Al , Al-Cu, Al-Si, Mg, stirred evenly and poured into a metal mold to form a master alloy ingot. The master alloy ingot was remelted at 720 ° C, atomized by argon gas under 1 MPa pressure, and sieved to obtain -325 mesh powder. The content of Si in the powder was 0.56wt.%, the content of Mg was 1.22wt.%, Cu The Fe content is 0.92wt.%, the Fe content is 0.01wt.%, and the Zn, Ti, Cr, and Mn contents cannot be detected. Aluminum powder and SiC powder with a volume content of 17% and an average particle size of 5 μm are mechanically mixed, and vacuum hot pressed at 650°C and 15MPa to form a composite ingot. Hot extrusion is carried out at 400°C, and the extrusion ratio is 15:1. Quenching is carried out at 530±5°C. After quenching, the elonga...

Embodiment 2

[0033] Use Al-Si powder containing 20wt.% Si, pure aluminum powder, pure magnesium powder, and Al-Cu powder containing 20wt.% Cu. The particle size of each powder is below 120 mesh, with a volume content of 30% and an average particle size of 5 μm The SiC powder is mechanically mixed to remove SiC particles. The alloy element ratio is Si: 0.42wt.%, the Mg content is 1.02wt.%, and the Cu content is 0.87wt.%. It is made by vacuum hot pressing at 650°C and 20MPa Composite billets. Hot extrusion is carried out at 450°C, and the extrusion ratio is 15:1. Quenching is carried out at 530±5°C. After quenching, the elongation of the composite material is 8%. At this time, stretching and straightening are carried out, and machining is carried out for two weeks, and then aged at 175±5°C for 6 hours to obtain a finished product. The tensile properties of the composite material are as follows: the tensile strength is 580MPa, the yield strength is 490MPa, and the elongation is 3.5%.

Embodiment 3

[0035] Use 17wt.% Si-containing silicon aluminum alloy (Al-Si master alloy), Al ingot, Mg ingot, and 50wt.% Cu-containing Al-Cu master alloy ingot to melt in an aluminum alloy melting furnace at a melting temperature of 750 ° C. The order of feeding is Al, Al-Cu, Al-Si, Mg, and stir evenly. The temperature is lowered to 620-650° C., and SiC particles with an average particle diameter of 10 μm are added by mechanical stirring, and the SiC addition amount is 20 wt.%. After heating up to 700°C and stirring evenly, the composite material melt is poured into a metal mold to form a composite material ingot. Sampling of drill cuttings from the composite material ingot, the composition of the matrix alloy was tested by extraction method as Si: 0.48wt.%, Mg: 0.98wt.%, Cu: 1.03wt.%. The composite material ingot was forged into a square billet at 450°C with a forging ratio of 1.5:1, and then the composite material was rolled into plates at 500°C in 5 passes with a deformation rate of 10...

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Abstract

The invention discloses an aluminum alloy used for preparing a high-strength high-plasticity aluminum matrix composite material and the aluminum matrix composite material, and belongs to the field of metal matrix composite materials and aluminum alloys. The aluminum alloy comprises chemical components including, by weight percent, 0.3%-0.7% of Si, 0.7%-1.4% of Mg, 0.6%-1.2% of Cu and the balance Al. Ceramic particles such as SiC, Al2O3, B4C, TiC and TiB2 and nanocarbon such as carbon nano tubes and graphene are added into the aluminum alloy to serve as a wild phase, the yield strength of the prepared composite material is obviously improved, and the composite material can reach the level of 2000 series aluminum alloy matrix composite material with the same wild phase content. Meanwhile, the aluminum matrix composite material has the good plasticity, and cold deformation machining can be carried out without cracking. Meanwhile, the natural aging negative effect (parking effect) of the prepared composite material is weak, and the strength of the composite material obtained through manual aging after natural aging can reach the strength value obtained through direct manual aging after quenching.

Description

technical field [0001] The invention relates to the technical field of metal-based composite materials and aluminum alloys, in particular to an aluminum alloy and an aluminum-based composite material for preparing high-strength and high-plasticity aluminum-based composite materials. Background technique [0002] The 2000 series high-strength aluminum alloy (Al-Cu-Mg) matrix composite materials have the characteristics of high strength, high modulus, and light weight, and have broad application prospects in aerospace, weapons, ships, and transportation. However, its elongation is low, and the elongation of typical Al-Cu-Mg-based composite materials at room temperature is only 3 to 6% (D.B.Miracle, Aeronautical applications of metal matrix composites, S.L.Donaldson (Eds.), ASM handbook, Composites, 2001 21, pp. 1043-1049 and D.J.Lloyd, Composites engineering handbook, P.K.Mallick (Ed.), Marcel Dekker Inc., New York, 1997, pp. 560-600), not only the service safety factor is low...

Claims

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Application Information

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IPC IPC(8): C22C21/08C22C21/02C22C21/16C22C32/00
CPCC22C21/02C22C21/08C22C21/14C22C21/16C22C26/00C22C32/00C22C32/0084C22C2026/002
Inventor 肖伯律王东王全兆马宗义
Owner 中科复材(滨州)新材料有限公司
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