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Rare earth Sc micro-alloyed Al-Mg-Si-Cu alloy and preparation method thereof

A technology of al-mg-si-cu-sc and microalloying, applied in the field of rare earth Sc microalloyed Al-Mg-Si-Cu alloy and its preparation, to achieve simple preparation process and heat treatment method, and improve comprehensive performance , the effect of uniform grain size distribution

Inactive Publication Date: 2014-08-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there has not been any report on Al-Mg-Si-Cu alloys microalloyed with rare earth Sc

Method used

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  • Rare earth Sc micro-alloyed Al-Mg-Si-Cu alloy and preparation method thereof
  • Rare earth Sc micro-alloyed Al-Mg-Si-Cu alloy and preparation method thereof
  • Rare earth Sc micro-alloyed Al-Mg-Si-Cu alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment prepares the rare earth Sc microalloyed Al-Mg-Si-Cu alloy according to the following steps:

[0042] Step 1: Preparation of Alloy Ingot

[0043] 1a, ingredients: according to the mass percentage of 97.45% Al, 0.9% Mg, 0.6% Si, 0.7% Cu, 0.2% Mn and 0.15% Sc, weigh 1065.7g metal Al (purity is 99.99%), 23.2gAl-50.38% Mg master alloy, 71.4gAl-10.92%Si master alloy, 25gAl-10.4%Mn master alloy, 18.2gAl-50.02%Cu master alloy and 96.5gAl-2.02%Sc master alloy are batched, and the total mass of the batch is 1300g;

[0044] 1b. Melting: First, add metal Al, Al-Mn master alloy, Al-Si master alloy and Al-Cu master alloy as raw material group A into a crucible preheated to 280°C, heat to 730°C, and keep the temperature until the raw material group When A softens and collapses, sprinkle a covering agent on the surface of the raw material group A (the quality of the covering agent is 6.5g); continue to keep constant temperature until the raw material group A is complet...

Embodiment 2

[0058] This example prepares the Al-Mg-Si-Cu-0.3Sc alloy material according to the same steps as Example 1, the difference is that in step 1a, 97.3% Al, 0.9% Mg, 0.6% Si, 0.7% Cu, 0.2% Mn And the mass percentage of 0.3% Sc, weigh 969.1g metal Al (purity is 99.99%), 23.2gAl-50.38%Mg master alloy, 71.4gAl-10.92%Si master alloy, 25gAl-10.4%Mn master alloy, 18.2gAl- 50.02% Cu master alloy and 193.1g Al-2.02% Sc master alloy are batched, and the total mass of the batch is 1300g;

[0059] Carry out room temperature tensile test to Al-Mg-Si-Cu-Mn-0.3Sc alloy material by the same method of embodiment 1, the obtained mechanical performance index is: tensile strength is 396.4MPa, and yield strength is 377MPa, and elongation is 29.76 %, see Table 1 for specific data.

Embodiment 3

[0061] This example prepares the Al-Mg-Si-Cu-0.45Sc alloy material according to the same steps as Example 1, the difference is that in step 1a, 97.15% Al, 0.9% Mg, 0.6% Si, 0.7% Cu, 0.2% Mn And the mass percentage of 0.45% Sc, weigh 872.6g metal Al (purity is 99.99%), 23.2gAl-50.38%Mg master alloy, 71.4gAl-10.92%Si master alloy, 25gAl-10.4%Mn master alloy, 18.2gAl- 50.02% Cu master alloy and 289.6g Al-2.02% Sc master alloy are batched, and the total mass of the batch is 1300g;

[0062] Carry out the tensile test at room temperature to Al-Mg-Si-Cu-0.45Sc alloy material by the same method of embodiment 1, the obtained mechanical property index is: tensile strength is 382MPa, and yield strength is 371MPa, and elongation is 27.38%, specifically See Table 1 for the data.

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Abstract

The invention discloses a rare earth Sc micro-alloyed Al-Mg-Si-Cu alloy and a preparation method thereof. The rare earth Sc micro-alloyed Al-Mg-Si-Cu alloy is characterized in that the Al-Mg-Si-Cu alloy contains rare earth Sc in the mass percentage of 0.15%-0.45% and an Al-Sc intermediate alloy which is melted in vacuum is added in the melting process of the Al-Mg-Si-Cu alloy according to the preparation method of the novel rare earth aluminum alloy. The Al-Mg-Si-Cu alloy disclosed by the invention has the advantages of simple processing technology and reasonable proportioning of components; through the micro-alloying action of rare earth Sc, Al-Mg-Si-Cu alloy grains are significantly refined, the strength of the alloy is improved and the plasticity of the alloy is improved; simultaneously, due to addition of Sc, Al3Sc mass points are formed, these mass points can take the effects of impeding dislocation motion and pinning a subboundary, the recrystallization of the Al-Mg-Si-Cu alloy is inhibited, the thermal stability of the Al-Mg-Si-Cu alloy is further improved and the range of forging temperature of the Al-Mg-Si-Cu alloy is broadened.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, and in particular relates to an Al-Mg-Si-Cu alloy with rare earth Sc microalloying and a preparation method thereof. Background technique [0002] Aluminum alloy has low density, high strength, easy processing, and good corrosion resistance. It is widely used in aerospace, transportation and other fields. It is the most widely used alloy in light metals, and its usage is second only to steel. In aerospace, marine, transportation and other fields, using aluminum alloy instead of steel is an effective way to reduce energy consumption. 6xxx series aluminum alloy (Al-Mg-Si alloy) has low density, excellent welding performance and corrosion resistance, high impact toughness and easy processing and forming. Al-Mg-Si-Cu alloy is based on Al-Mg-Si alloy Developed, compared with Al-Mg-Si alloy, it has excellent mechanical properties, and also shows good comprehensive performance in terms of cor...

Claims

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Application Information

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IPC IPC(8): C22C21/08C22C1/03C22F1/047
Inventor 陈文琳吴跃曾侗
Owner HEFEI UNIV OF TECH
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