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High-strength high-ductility corrosion-resistant Al-Zn-Mg-(Cu) alloy

A high-strength, high-toughness, alloy technology, applied in the field of high-strength, high-toughness, corrosion-resistant Al-Zn-Mg-alloys, can solve the problems of expensive and difficult industrial aluminum alloy production, achieve cheap prices, maintain deformation recovery structure, and inhibit regeneration crystallization effect

Inactive Publication Date: 2008-06-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of Sc, the current market price is about 40,000 RMB / kg, so it is difficult to be practically used in the production of industrial aluminum alloys.

Method used

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  • High-strength high-ductility corrosion-resistant Al-Zn-Mg-(Cu) alloy
  • High-strength high-ductility corrosion-resistant Al-Zn-Mg-(Cu) alloy
  • High-strength high-ductility corrosion-resistant Al-Zn-Mg-(Cu) alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Preparation of Al-8.6%Zn-2.5%Mg-2.2%Cu-0.08%Zr-0.1%Cr alloy. The raw materials used are high-purity aluminum (purity 99.99%), industrial pure Mg (purity 99.9%), industrial pure Zn (purity 99.9%), Al-Cu master alloy, Al-Zr master alloy, Al-Cr master alloy . First, high-purity aluminum is added to graphite clay crucible and melted in a resistance crucible furnace at a melting temperature of 780°C. After high-purity aluminum is melted, Al-Cu, Al-Cr, Al-Zr intermediate alloys are added and the temperature drops to 760°C. Add industrial pure Zn, melt and stir well, then add industrial pure Mg, remove surface slag, add 0.2% to 0.4% hexachloroethane (C 2 Cl 6 ) Refining agent deslagging and degassing, let it stand for 10 to 15 minutes, pour it into the iron mold, and demould after cooling.

Embodiment 2

[0033] Example 2: Preparation of Al-8.6%Zn-2.5%Mg-2.2%Cu-0.08%Zr-0.1%Cr-0.1Yb% (wt%) alloy. The raw materials used are high-purity aluminum (purity 99.99%), industrial pure Mg (purity 99.9%), industrial pure Zn (purity 99.9%), Al-Cu master alloy, Al-Zr master alloy, Al-Cr master alloy , Al-Yb master alloy. First, high-purity aluminum is added to the graphite clay crucible, and melted in a resistance crucible furnace at a melting temperature of 780°C. After the high-purity aluminum is melted, Al-Yb, Al-Cu, Al-Cr, and Al-Zr intermediate alloys are added to reduce the temperature. to 760°C, add industrial pure Zn, melt and stir well, then add industrial pure Mg, remove surface slag, add 0.2% to 0.4% hexachloroethane (C 2 Cl 6 ) Refining agent deslagging and degassing, let it stand for 10 to 15 minutes, pour it into the iron mold, and demould after cooling.

Embodiment 3

[0034] Example 3: Preparation of Al-8.6%Zn-2.5%Mg-2.2%Cu-0.08%Zr-0.1%Cr-0.1Er% (wt%) alloy. The raw materials used are high-purity aluminum (purity 99.99%), industrial pure Mg (purity 99.9%), industrial pure Zn (purity 99.9%), Al-Cu master alloy, Al-Zr master alloy, Al-Cr master alloy , Al-Er master alloy. First, high-purity aluminum is added to the graphite clay crucible, and melted in a resistance crucible furnace at a melting temperature of 780°C. After the high-purity aluminum is melted, Al-Er, Al-Cu, Al-Cr, and Al-Zr intermediate alloys are added to reduce the temperature. to 760°C, add industrial pure Zn, melt and stir well, then add industrial pure Mg, remove surface slag, add 0.2% to 0.4% hexachloroethane (C 2 Cl 6 ) Refining agent deslagging and degassing, let it stand for 10 to 15 minutes, pour it into the iron mold, and demould after cooling.

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Abstract

The invention discloses a high-strength high-toughness corrosion-resistant Al-Zn-Mg-(Cu) alloy. Appropriate Cr is also added when Zr is added in the Al-Zn-Mg-(Cu) alloy; or when the Zr is added, the Cr and rare earth element Er or Yb are added. After composite addition of the elements, the invention can improve recrystallization resistance of the Al-Zn-Mg-(Cu) alloy, improve the strength, the fracture toughness and the anti-stress-corrosion performance of the alloy at the same time; micro-alloys such as Zr, Cr and so on, and the rare earth metal Er or Yb have relatively low cost and are more suitable for industrialization production.

Description

technical field [0001] The invention relates to the preparation of metal alloys, in particular to the field of high-strength, high-toughness, corrosion-resistant Al-Zn-Mg-(Cu) alloys. Background technique [0002] Forming fine coherent dispersed phases through microalloying, effectively inhibiting recrystallization and grain growth, and maintaining the deformation recovery structure is a way to simultaneously improve the strength and stress corrosion resistance of high-strength and super-strength aluminum alloys. In the early stage, the non-coherent aluminide dispersed phase was formed by adding trace amounts of Cr and Mn. Later changed to add Zr to form metastable L1 2 Type Al 3 Zr coherent dispersed phase, which improves the resistance to recrystallization and improves stress corrosion resistance, but metastable L1 2 Type Al 3 Zr transforms into incoherent stable DO during long-term homogenization and solution treatment at high temperature 23 Type Al 3 Zr dispersed p...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/03
Inventor 陈康华方华婵张茁祝昌军黄兰萍
Owner CENT SOUTH UNIV
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