Low-Sc high-strength high-toughness high-hardenability aluminum-zinc-magnesium alloy and preparation method thereof

A high-strength, high-toughness, and high-hardenability technology, applied in the field of aluminum alloy preparation, can solve the problems of reduced alloy hardenability, low limit of hardenability, and high price, so as to reduce adverse effects, reduce manufacturing costs, and reduce manufacturing costs. Effect

Active Publication Date: 2018-08-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, Sc is a rare element and its price is high. The manufacturing cost of Sc-containing aluminum alloys is basically controlled by the Sc content. At the same time, scandium also significantly reduces the hardenability of the alloy. The depth of the hardened layer is only 50mm
High cost and low hardenability limit its application range

Method used

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  • Low-Sc high-strength high-toughness high-hardenability aluminum-zinc-magnesium alloy and preparation method thereof
  • Low-Sc high-strength high-toughness high-hardenability aluminum-zinc-magnesium alloy and preparation method thereof
  • Low-Sc high-strength high-toughness high-hardenability aluminum-zinc-magnesium alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] (1) The chemical composition of the alloy is shown in Table 1.

[0041] Chemical composition (mass fraction, %) of table 1 alloy

[0042]

[0043] (2) Add aluminum ingots, Al-Cu, Al-Mn, Al-Zr, Al-Cr into the melting furnace at a temperature of 720-740 ° C to melt according to the content required in Table 1; when the temperature of the molten aluminum rises to 800 ° C, add Al-Sc master alloy, stirring, heat preservation; when the melt is 720°C, add Zn, Al-Ti, and Mg; slag removal, stirring, composition adjustment, refining; stand still for 30 minutes.

[0044] (3) The melt is refined and degassed and left to stand for semi-continuous casting into ingots. The casting temperature is 720°C, the water pressure is 0.14MPa, and the casting speed is 35mm / min.

[0045] (4) Homogenize the above-mentioned ingot for 8 hours at a temperature of 340° C., and air-cool; then homogenize the ingot for 20 hours at a temperature of 465° C. After the homogenization treatment, the ingot...

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Abstract

The invention discloses a low-Sc high-strength high-toughness high-hardenability aluminum-zinc-magnesium alloy and a preparation method thereof. The alloy is prepared from the following components inpercentage by mass: 5.5-6.0% of Zn, 1.8-2.2% of Mg, 0.3-0.4% of Cu, 0.2-0.4% of Mn, 0.05-0.12% of Sc, 0.06-0.12% of Zr, 0.05-0.20% of Cr, 0.03-0.06% of Ti and the balance of Al, wherein total contentof impurities such as Fe and Si is not greater than 0.15%. The preparation method comprises the following steps: adopting semi-continuous chilling and casting, and cast ingot two-stage homogenizing treatment to obtain nano-scale Al3(Sc, Zr), sub-micron A17Cr and A16Mn precipitated phase; and obtaining sub-structure reinforcing, precipitation reinforcing and diffusion reinforcing in a follow-up thermal processing process and a thermal treatment process. The low-Sc high-strength high-toughness high-hardenability aluminum-zinc-magnesium alloy adopts Cr and Mn to cooperatively add and partially substitute Sc; compared with an existing Al-Zn-Mg-Sc-Zr Alloy, the alloy has slightly improved in single alloy tensile strength, yield strength and elongation in case of reducing Sc content of the alloyby 60%; and full quenching depth is increased to 150 mm from 50 mm, and manufacturing cost is reduced by 45%.

Description

technical field [0001] The invention discloses a low-Sc content, high-strength, high-toughness, high-hardenability aluminum-zinc-magnesium alloy and a preparation method; specifically, a low-Sc content, high-strength, high-toughness, and high-hardenability Al-Zn-Mg-Cu-Mn- The Sc-Zr-Cr alloy and its preparation method belong to the technical field of aluminum alloy preparation. Background technique [0002] The existing Al-Zn-Mg-Cu-Sc-Zr alloy is a new type of lightweight, high-strength weldable structural material for aerospace due to its high strength, toughness and good weldability. [0003] Trace amounts of Sc and Zr are added to Al-Mg alloys and Al-Zn-Mg alloys, Sc, Zr and Al form primary and secondary Al 3 (Sc 1-x Zr x ) particles, which are coherent with the matrix, and have triple strengthening effects of as-cast grain refinement strengthening, substructure strengthening and precipitation strengthening, so Al-Mg-Sc alloys and Al-Zn-Mg-Sc alloys have high strength. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C1/026C22C1/03C22C21/10C22F1/002C22F1/053
Inventor 黄继武尹志民徐国富谭东政
Owner CENT SOUTH UNIV
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