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Titanium microalloying high-silicon-content aluminum alloy and preparing method thereof

A technology of micro-alloying and aluminum alloy, which is applied in the field of plastic processing and alloy preparation of metal materials, can solve the problems of easy deformation and wear, small alloy stiffness, and reduced elongation, and achieve easy plastic processing, high elastic modulus, The effect of large elastic modulus

Inactive Publication Date: 2017-07-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small amount of strengthening elements contained, the strength is low, especially the stiffness is small, but it has very excellent ductility, and it can be easily formed by extrusion (GB 5237.1-2004 standard: 6063 alloy T6 state σ b ≥205MPa, σ 0.2 ≥180MPa, δ≥8.0%), but this type of alloy has small rigidity and low hardness, and is easily deformed and worn during use, which seriously affects the application in large-scale building structures
High-silicon aluminum alloys with a silicon content of 11.0% to 14.0% by mass are mostly used for casting molding due to their excellent fluidity. Adding a small amount of Mg to the cast aluminum-silicon-based alloy can greatly improve its strength and elastic modulus. , but the elongation is greatly reduced

Method used

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  • Titanium microalloying high-silicon-content aluminum alloy and preparing method thereof
  • Titanium microalloying high-silicon-content aluminum alloy and preparing method thereof
  • Titanium microalloying high-silicon-content aluminum alloy and preparing method thereof

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Embodiment 1

[0026] The raw material is an aluminum-silicon master alloy of Al-12.53wt% Si. Add the near-eutectic aluminum-silicon alloy of Al-12.53wt% Si to the graphite crucible, and add an appropriate amount of pure silicon and the master alloy of Al-4wt% Ti, so that the silicon mass percentage of the alloy is 12.3%, and the mass percentage of titanium is Hexachloroethane is added to refine after the temperature of the melt drops to 730°C, and after standing for 10 minutes, pour into the melt Add 0.5wt% pure magnesium ingot, keep it warm for 30 minutes and then drop it to 730°C, then add Al-10wt% Sr and Al-3wt% B master alloy, keep it warm for 30 minutes, wait for the temperature to stabilize at 730°C, and put it under vacuum for 60 minutes Then the obtained melt is cast into a cast iron mold, and naturally cooled to form an ingot; after the ingot is subjected to homogenization annealing at 535° C. for 6 hours, hot extrusion is carried out at 535° C. (extrusion ratio 32), and quenched i...

Embodiment 2

[0029]The raw material is an aluminum-silicon master alloy of Al-12.03wt% Si. Add the near-eutectic aluminum-silicon alloy of Al-12.03wt% Si to the graphite crucible, and add an appropriate amount of pure silicon and the master alloy of Al-4wt% Ti, so that the mass percentage of silicon in the alloy is 12.0%, and the mass percentage of titanium Hexachloroethane is added to refine after the temperature of the melt drops to 730°C, and after standing for 10 minutes, pour into the melt Add 0.7wt% pure magnesium ingot, keep it warm for 30 minutes and then drop it to 730°C, then add Al-10wt% Sr and Al-3wt% B master alloy, keep it warm for 30 minutes, wait for the temperature to stabilize at 730°C, and put it under vacuum for 60 minutes Then the melt obtained is poured into a cast iron mold, and naturally cooled to form an ingot; after the ingot is carried out to 535 ° C * 6h homogenization annealing, hot rolling is carried out at 500 ° C (reduction ratio 67%), Immediately quenched ...

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Abstract

The invention discloses a titanium microalloying high-silicon-content aluminum alloy and a preparing method thereof. The aluminum alloy comprises, by mass percent, 11.0%-14.0% of Si, 0.2%-0.7% of Mg, smaller than or equal to 0.15% of Fe, 0.015%-0.04% of Sr, 0.01%-0.03% of B, 0.05%-0.25% of Ti and the balance aluminum. The preparing method includes the steps that an aluminum-silicon intermediate alloy, a magnesium element, a silicon element and a titanium element are heated and melted, hexachloroethane is added for refining when melt is heated to 720 DEG C to 740 DEG C, Al-Sr and Al-B intermediate alloys are added for metamorphism treatment and grain refining treatment after standing is conducted, heat preservation is conducted for 30 min, vacuum standing is conducted for 30 min to 60 min, the mixture is heated to 710 DEG C to 730 DEG C and poured into a die, and a cast ingot is obtained; annealing is conducted for 3 h to 6 h under the temperature ranging from 520 DEG C to 540 DEG C; and hot extrusion or hot rolling deformation is conducted under the temperature ranging from 400 DEG C to 500 DEG C.

Description

technical field [0001] The invention belongs to the field of alloy preparation and plastic processing of metal materials, and in particular relates to a titanium microalloyed high-silicon aluminum alloy and a preparation method thereof. Background technique [0002] my country's architectural aluminum profiles are made of 6000 series Al-Si-Mg alloys. The alloy contains approximately 0.5% each of Mg and Si, with the balance being Al, and is a single-phase alloy. Due to the small amount of strengthening elements contained, the strength is low, especially the stiffness is small, but it has very excellent ductility, and it can be easily formed by extrusion (GB 5237.1-2004 standard: 6063 alloy T6 state σ b ≥205MPa, σ 0.2 ≥180MPa, δ≥8.0%), but this type of alloy has low rigidity and low hardness, and is easily deformed and worn during use, which seriously affects the application in large-scale building structures. High-silicon aluminum alloys with a silicon content of 11.0% to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03C22C1/06C22F1/043
CPCC22C21/04C22C1/026C22C1/03C22C1/06C22F1/043
Inventor 廖恒成冯子荥
Owner SOUTHEAST UNIV
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