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CN-117551903-B - Ultrahigh-strength aluminum alloy material and preparation method and application thereof

CN117551903BCN 117551903 BCN117551903 BCN 117551903BCN-117551903-B

Abstract

The invention discloses an ultrahigh-strength aluminum alloy material, and a preparation method and application thereof. The ultra-high strength aluminum alloy material comprises the following alloy raw materials ：Zn：9.1～14.5％,Mg：2.3～4.5％,Cu：1.1～3.1％,Sc：0.4～0.7％;Zr：0.1～0.3％,Ti：0.1～0.3％,Mn：0.1～0.8％,Be：0.05～0.5％,Fe≤0.4％,Si≤0.2％,Al in percentage by mass as the rest. Smelting, refining and casting the alloy raw materials to obtain an ingot, and sequentially performing primary aging treatment, multistage homogenization heat treatment, thermal deformation treatment, solid solution treatment and secondary aging treatment on the ingot to obtain the alloy. The nano Al 3 (Sc x ,Zr 1‑x ) secondary aging phase which is dispersed and distributed is introduced into the aluminum alloy material through the primary aging treatment, and the MgZn 2 main aging phase generated by the secondary aging treatment has obvious synergistic strengthening effect, so that the alloy performance is greatly improved, and the tensile strength is up to 850MPa.

Inventors

  • LIU HONGTAO
  • XIONG JIN
  • ZHOU JIXUE
  • LIU YUNTENG
  • YANG HUABING
  • SONG LINGHUI
  • WANG MEIFANG
  • WU JIANHUA
  • CHENG KAIMING

Assignees

  • 山东省科学院新材料研究所

Dates

Publication Date
20260508
Application Date
20231115

Claims (8)

  1. 1. The preparation method of the ultra-high strength aluminum alloy material is characterized in that the ultra-high strength aluminum alloy material comprises the following alloy raw materials in percentage by mass: Zn：9.1~14.5%,Mg：2.3~4.5%,Cu：1.1~3.1%,Sc：0.4~0.7%;Zr：0.1~0.3%,Ti：0.1~0.3%,Mn：0.1~0.8%,Be：0.05~0.5%,Fe≤0.4%,Si≤0.2%,Al Is the balance; Smelting, refining and casting the alloy raw materials to obtain an ingot, and sequentially performing primary aging treatment, multistage homogenization heat treatment, thermal deformation treatment, solid solution treatment and secondary aging treatment on the ingot; in the alloy raw material, zn/Mg=2-4, mg/Cu=1.1-2.3, and (Mn+Be)/Fe is more than or equal to 1.0; The ultra-high strength aluminum alloy material simultaneously retains MgZn 2 and Al 3 (Sc x ,Zr 1-x ) two nano ageing strengthening phases; The temperature of the first aging treatment is 250-370 ℃, and the heat preservation time is 20-40 h; The temperature of the second aging treatment is 110-130 ℃, and the heat preservation time is 20-30h.
  2. 2. The method according to claim 1, wherein the alloy raw material is melted at 750-850 ℃, the alloy raw material is refined at 740-750 ℃, the alloy raw material is cast at 700-730 ℃, and the cast die is a water-cooled copper die.
  3. 3. The method according to claim 1, wherein the temperature of the multistage homogenization heat treatment is 400 to 480 ℃.
  4. 4. The method according to claim 1, wherein the step of the multistage homogenization heat treatment is carried out by maintaining the temperature at 400-410 ℃ for 2-4 hours, 425-435 ℃ for 2-4 hours, 445-460 ℃ for 2-4 hours, and 470-480 ℃ for 18-24 hours.
  5. 5. The method according to claim 1, wherein the heat distortion treatment is performed at a temperature of 380 to 520 ℃ by one selected from the group consisting of hot extrusion, isodiametric angle extrusion, hot forging and hot rolling.
  6. 6. The method according to claim 1, wherein the solution treatment is carried out at a temperature of 450 to 490 ℃ for a holding time of 0.5 to 2 hours.
  7. 7. An ultrahigh-strength aluminum alloy material prepared by the preparation method of any one of claims 1 to 6, characterized in that the tensile strength of the ultrahigh-strength aluminum alloy material is above 800MPa.
  8. 8. Use of the ultra-high strength aluminum alloy material as claimed in claim 7 in the fields of aerospace, nuclear industry, automotive or petroleum equipment.

Description

Ultrahigh-strength aluminum alloy material and preparation method and application thereof Technical Field The invention relates to the technical field of aluminum alloy, in particular to an ultrahigh-strength aluminum alloy material, and a preparation method and application thereof. Background The information disclosed in the background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. The Al-Zn-Mg-Cu aluminum alloy material has the advantages of low density, high strength, easy processing and the like, and is an important structural material of aircraft, rocket, rail transit and weapon equipment. The tensile strength of the current Al-Zn-Mg-Cu aluminum alloy material is basically between 500 and 700MPa, and under certain service conditions with higher requirements on the performance of structural members, the conventional metal materials such as steel and the like can be still adopted. The patent CN100415918C discloses an aluminum alloy material with high Zn content, ultra-high strength, high toughness and high damage tolerance and a preparation method thereof, wherein the alloy comprises 9-10wt% of Zn, 2.0-2.5% of Mg, 1.2-1.7% of Cu, 0.2-0.5% of Zr and the balance of Al. After the alloy is melted, inert gas is used as atomizing gas, and the alloy is prepared by rapid spray solidification forming, wherein the tensile strength of the alloy exceeds 750MPa. The aluminum alloy material with higher strength can be obtained by adopting the spray forming rapid solidification, but the process is complex, the cost is high, and the large-size material is difficult to manufacture. Patent CN114990396B discloses an ultra-high strength 7000 series aluminum alloy material, a preparation method and application thereof, wherein the alloy elements comprise Al, zn, mg, cu, zr, er, si and Fe, the content of Zn is 6.8-11%, the content of Mg is 1.8-3.0%, the content of Cu is 1.2-2.8%, the content of Er is 0.1-0.5%, the content of Zr is 0.1-0.15%, and Si and Fe are impurity elements. Which cast the melt into billets, which are subsequently subjected to homogenization, extrusion, rolling, solution and aging treatments. The tensile strength of the prepared aluminum alloy material is up to 773MPa. Therefore, how to prepare the ultra-high-strength aluminum alloy material with the tensile strength higher than 800MPa is one of the problems to be solved in the prior art. Disclosure of Invention In view of the above, the invention provides an ultrahigh-strength aluminum alloy material, a preparation method and application thereof, and the tensile strength of the prepared ultrahigh-strength aluminum alloy material can be up to more than 800 MPa. In a first aspect, the invention provides a preparation method of an ultra-high strength aluminum alloy material, wherein the ultra-high strength aluminum alloy material comprises the following alloy raw materials in percentage by mass: Zn：9.1～14.5％,Mg：2.3～4.5％,Cu：1.1～3.1％,Sc：0.4～0.7％;Zr：0.1～0.3％,Ti：0.1～0.3％,Mn：0.1～0.8％,Be：0.05～0.5％,Fe≤0.4％,Si≤0.2％,Al Is the balance; Smelting, refining and casting the alloy raw materials to obtain an ingot, and sequentially performing primary aging treatment, multistage homogenization heat treatment, thermal deformation treatment, solid solution and secondary aging treatment on the ingot. Preferably, in the alloy raw material, zn/Mg=2-4, mg/Cu=1.1-2.3, and (Mn+Be)/Fe is more than or equal to 1.0. Preferably, the smelting temperature of the alloy raw material is 750-850 ℃, the refining temperature is 740-750 ℃, the casting temperature is 700-730 ℃, and further, the casting die is a water-cooled copper die. Preferably, the temperature of the first aging treatment is 250-370 ℃, and the heat preservation time is 20-40 h. Preferably, the temperature of the multi-stage homogenization heat treatment is 400-480 ℃, and more preferably, the steps of the multi-stage homogenization heat treatment are that the temperature is 400-410 ℃ for 2-4 h, 425-435 ℃ for 2-4 h, 445-460 ℃ for 2-4 h and 470-480 ℃ for 18-24 h. Preferably, the thermal deformation treatment method is selected from one of hot extrusion, equal-diameter angular extrusion, hot forging and hot rolling, and the temperature of the thermal deformation treatment is 380-520 ℃. Preferably, the temperature of the solution treatment is 450-490 ℃ and the heat preservation time is 0.5-2h. Preferably, the temperature of the second aging treatment is 110-130 ℃, and the heat preservation time is 20-30h. In a second aspect, the invention provides the ultrahigh-strength aluminum alloy material obtained by the preparation method, and the tensile strength of the ultrahigh-strength aluminum alloy material is more than 800 MPa. In a third aspect, the invention provides the application of the ultra-high strength