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A kind of high-strength plastic al-mg-si-zn alloy for automobile and preparation method thereof

A technology of al-mg-si-zn and alloy, which is applied in the field of aluminum alloy for automobiles, can solve the problems of difficult to achieve high plasticity, complex distribution, low strength and plasticity, etc.

Active Publication Date: 2021-09-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with traditional automobile steel plates, the strength and plasticity of Al-Mg-Si aluminum alloys for automobile bodies are lower, and it is difficult to meet the mechanical properties requirements of aluminum alloys for automobile bodies.
[0003] At present, although some researchers improve the precipitation of Al-Mg-Si series aluminum alloys by adding Zn elements to improve their strength and hardness, there are many types of precipitation phases of Al-Mg-Si series aluminum alloys with Zn added and the distribution complex, making it difficult to reach a high level of plasticity

Method used

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  • A kind of high-strength plastic al-mg-si-zn alloy for automobile and preparation method thereof
  • A kind of high-strength plastic al-mg-si-zn alloy for automobile and preparation method thereof

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preparation example Construction

[0032] The present invention also provides a method for preparing a high-strength plastic Al-Mg-Si-Zn alloy for automobiles described in the above technical solution, comprising the following steps:

[0033] (1) Melting the alloy raw material and casting it to obtain an ingot;

[0034] (2) performing the first-level homogenization heat treatment and the second-level homogenization heat treatment sequentially on the ingot obtained in the step (1) to obtain a homogenized alloy;

[0035] (3) hot-rolling and cold-rolling the homogenized alloy obtained in the step (2) sequentially to obtain an aluminum alloy body;

[0036] (4) The aluminum alloy body obtained in the step (3) is sequentially subjected to primary solution treatment and secondary solution treatment to obtain a solid solution aluminum alloy;

[0037] (5) The solid-solution aluminum alloy obtained in the step (4) is subjected to primary aging treatment and secondary aging treatment sequentially to obtain a high-strengt...

Embodiment 1

[0067] The high-strength plasticity Al-Mg-Si-Zn alloy for automobile of this embodiment, by mass percentage, Mg 0.52%, Si0.59%, the Al of Zn 3.5% and surplus; The mass relation of Mg and Si satisfies Mg:Si= 0.88. Concrete preparation steps are as follows:

[0068] (1) Melting high-purity aluminum, high-purity magnesium, aluminum-silicon master alloy, and aluminum-zinc master alloy in a vacuum melting furnace at a temperature of 680°C for 0.5 hours, and then casting them in metal copper molds to obtain ingots;

[0069] (2) Heat the ingot obtained in step (1) to 455°C at a heating rate of 5°C / min, keep it warm for 8 hours, and then cool to room temperature with the furnace to complete the first-level homogenization heat treatment; The heating rate is raised to 555°C and kept for 16 hours, then cooled to room temperature with the furnace, and the second-level homogenization heat treatment is completed to obtain a homogenized alloy;

[0070] (3) Heat the homogenized alloy obtain...

Embodiment 2

[0073] The high-strength ductility Al-Mg-Si-Zn alloy for automobile of this embodiment, by mass percentage, Mg 2.20%, Si2.45%, the Al of Zn 2.30% and surplus; The mass relation of Mg and Si satisfies Mg:Si= 0.90. The specific preparation steps and parameters thereof are the same as in Example 1, and an Al-2.2Mg-2.45Si-3.3Zn alloy is prepared.

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Abstract

The invention provides a high-strength plastic Al-Mg-Si-Zn alloy for automobiles and a preparation method thereof, belonging to the field of aluminum alloys for automobiles. The high-strength plastic Al-Mg-Si-Zn alloy for automobiles provided by the invention comprises 0.52 to 2.25% of Mg, 0.42 to 2.75% of Si, 2.15 to 3.53% of Zn and the rest of Al in terms of mass percentage; the Mg and The mass relation of Si satisfies Mg:Si=0.85˜1.25. Experimental results show that the high-strength plasticity Al-Mg-Si-Zn alloy for automobiles provided by the invention has a yield strength of 323-332MPa, a tensile strength of 364-370MPa, a Vickers hardness of 125-135HV, and an elongation of 20.4-22.1%.

Description

technical field [0001] The invention relates to the field of aluminum alloys for automobiles, in particular to a high-strength plastic Al-Mg-Si-Zn alloy for automobiles and a preparation method thereof. Background technique [0002] With the increasing awareness of energy conservation and environmental protection, automobile lightweight has become the frontier and hot issue of automobile industry technology in the 21st century. The Al-Mg-Si aluminum alloy strengthened by heat treatment is the key material of aluminum alloy for automobile body because of its excellent weldability and corrosion resistance, no stress corrosion cracking tendency and good formability. However, compared with traditional automobile steel plates, the strength and plasticity of Al-Mg-Si aluminum alloys for automobile bodies are lower, and it is difficult to meet the mechanical properties requirements of aluminum alloys for automobile bodies. [0003] At present, although some researchers improve the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/053
Inventor 杨文超马伟沈伟伟刘林张军冀守勋苏海军郭敏黄太文
Owner NORTHWESTERN POLYTECHNICAL UNIV