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Rare earth Er microalloyed Al-Zn-Mg-Cu alloy and preparation method thereof

A technology of microalloying and alloying, applied in the field of metal alloys, can solve the problem of no report on microalloying

Active Publication Date: 2011-04-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microalloying effect of Er in high Zn Al-Zn-Mg-Cu alloys has not been reported.

Method used

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  • Rare earth Er microalloyed Al-Zn-Mg-Cu alloy and preparation method thereof
  • Rare earth Er microalloyed Al-Zn-Mg-Cu alloy and preparation method thereof
  • Rare earth Er microalloyed Al-Zn-Mg-Cu alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Example 1: Using high-purity aluminum (Al99.70), high-purity Mg (Mg9995), industrial pure Zn (Zn≥98.7wt.%) and Al-5.03Cu, Al-6.00Er (except the alloy without adding Er) , Al-4.50Zr master alloy as the raw material, according to the chemical composition requirements of the alloy in Table 1. First put the aluminum ingot into the furnace, and after the aluminum ingot is melted, add pure zinc, aluminum-copper master alloy, aluminum-zirconium master alloy and aluminum-erbium master alloy successively. After the metal and the intermediate alloy are melted, remove the dross on the surface of the melt, and when the melt temperature reaches 715-735°C, add pure magnesium. In order to distribute the alloying elements evenly, stir the melt, and then refine it. Refining is placed at 710-730°C for 20-35 minutes, then the scum on the surface is removed, and then it is placed at a casting temperature of 700-720°C. Cast into alloy billets. Two-stage homogenization annealing is carried...

example 2

[0025] Example 2: Using high-purity aluminum (Al99.70), high-purity Mg (Mg9995), industrial pure Zn (Zn≥98.7wt.%) and Al-5.03Cu, Al-6.00Er (except the alloy without adding Er) , Al-4.50Zr master alloy as the raw material, according to the chemical composition requirements of the alloy in Table 1. First put the aluminum ingot into the furnace, and after the aluminum ingot is melted, add pure zinc, aluminum-copper master alloy, aluminum-zirconium master alloy and aluminum-erbium master alloy successively. After the metal and the intermediate alloy are melted, remove the dross on the surface of the melt, and when the melt temperature reaches 715-735°C, add pure magnesium. In order to distribute the alloying elements evenly, the melt is stirred. Refining is carried out afterwards, and the refining is left to stand at 710-730°C for 20-35 minutes, then the scum on the surface is removed, and then left to stand at a casting temperature of 700-720°C before being cast into an alloy in...

example 3

[0029] Example 3: Using high-purity aluminum (Al99.70), high-purity Mg (Mg9995), industrial pure Zn (Zn≥98.7wt.%) and Al-5.03Cu, Al-6.00Er (except the alloy without adding Er) , Al-4.50Zr master alloy as the raw material, according to the chemical composition requirements of the alloy in Table 1. First put the aluminum ingot into the furnace, and after the aluminum ingot is melted, add pure zinc, aluminum-copper master alloy, aluminum-zirconium master alloy and aluminum-erbium master alloy successively. After the metal and the intermediate alloy are melted, remove the dross on the surface of the melt, and when the melt temperature reaches 715-735°C, add pure magnesium. In order to distribute the alloying elements evenly, the melt is stirred. Refining is carried out afterwards, and the refining is left to stand at 710-730°C for 20-35 minutes, then the scum on the surface is removed, and then left to stand at a casting temperature of 700-720°C before being cast into an alloy in...

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Abstract

The invention discloses a rare earth Er microalloyed Al-Zn-Mg-Cu alloy and a preparation method thereof, which belong to the technical field of metal alloy. In the invention, 0.02 to 0.1 weight percent of rare earth Er is added into an Al-Zn-Mg-Cu alloy. The method comprises: firstly, coasting an alloy ingot, and annealing by a double-stage homogenizing annealing process; secondly, performing forging deformation or extrusion deformation and solution treatment at 465 to 475 DEG C; and finally, performing peak aging treatment or double-stage overaging treatment. In the invention, the rare earthEr is added into the Al-Zn-Mg-Cu alloy in a proper amount and mode to produce effective microalloying effect with the alloy, so that the alloy has high strength and high plasticity and fracture toughness.

Description

technical field [0001] The invention belongs to the technical field of metal alloys, and in particular relates to an aluminum alloy material microalloyed with rare earth Er and a preparation method thereof. Background technique [0002] Ultra-high-strength Al-Zn-Mg-Cu alloy has high specific strength and specific stiffness, and is economical and easy to process and form. It is widely used in the aerospace field and has become one of the important materials in this field. [0003] In high-strength aluminum alloys, as the content of the main alloying elements Zn, Mg and Cu increases, the strength of the aluminum alloy increases, but the plasticity, fracture toughness and corrosion resistance of the aluminum alloy decrease significantly. At the same time, due to the high density and low melting point of Zn, the composition segregation and thermal cracking of high-Zn aluminum alloy are easy to occur during the preparation process, and the casting performance of the alloy is redu...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/02C22F1/053
Inventor 聂祚仁陈子勇莫远科于振兴黄晖
Owner BEIJING UNIV OF TECH
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