A kind of aluminum alloy with rapid aging response of ag microalloying and its preparation method and application
An aluminum alloy and aging treatment technology, which is applied in the field of metal materials, can solve the problems of limited strength improvement and achieve the effect of inhibiting the natural aging process of alloys
Active Publication Date: 2022-04-26
云南律奥新技术开发有限公司
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Problems solved by technology
However, during the bake aging process, Ag atoms promote the Mg 2 Si rapidly ages and precipitates, but the improvement in strength is still limited
Method used
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Embodiment 1-3 and comparative example 1-2
[0032] Table 1-1 Example 1-3 (ingot numbers corresponding to 1#-3#) and Comparative Example 1-2 (ingot numbers corresponding to 4#-5#), the components and weight percentages of the aluminum alloys obtained respectively .
[0033]
[0034] The preparation method of aluminum alloy is:
[0035] 1) Proportioning raw materials: Proportioning raw materials according to the components and weight percentages described in Table 1-1, and using 4# alloy without adding trace Ag element and 5# alloy without adding Cu element as comparison;
[0036] 2) Raw material smelting: under the temperature condition of 745°C, first melt high-purity aluminum ingots, then add Al-Mn10, Al-Cu50, Al-Si15, Al-Ag5 master alloys, add 99.99% magnesium and covering agent;
[0037] 3) Refining: Add hexachloroethane to the completely melted molten metal for degassing treatment, and fully stir. During refining, the metal temperature should be maintained within the range of 740°C. less than 30 minutes;
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Abstract
The invention belongs to the technical field of metal materials, and discloses an aluminum alloy with rapid aging response by Ag microalloying and its preparation method and application, including Mg 0.5-0.9%, Si 0.7-1.1%, Cu 0.2-0.6 by weight percentage %, Mn 0.15‑0.4%, Ag 0.05‑0.1%, and Fe≤0.5%. The present invention is based on the principle of microalloying, and optimizes the mass ratio of Mg and Si to (0.75-1): 1; the mass ratio of Cu to (Mg+Si) is (0.14-0.22): 1; the mass ratio of Ag to Cu For (0.20‑0.35): 1, Ag‑Cu‑vacancy clusters are formed in the early stage of pre-aging, which serve as the nucleation and growth cores of the precipitation phase of the aging paint, and through the Ag‑Cu‑vacancy clusters at the precipitate phase / matrix interface, the Mg 2 Si phase, Q phase (Al 5 Cu 2 Mg 8 Si 6 ) precipitation to achieve rapid aging strengthening of the aluminum alloy during the aging process of the paint; after the pre-aging of the alloy, Ag-Cu-vacancy clusters are preferentially formed, which more significantly inhibits the natural aging process of the alloy and is beneficial to the subsequent bake-aging hardening. The invention can obtain fast aging response aluminum alloy, which is suitable for processing and production of automobile body structure.
Description
technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to an aluminum alloy with rapid aging response by Ag microalloying and its preparation method and application. Background technique [0002] 6xxx series aluminum alloys (i.e. Al-Mg-Si series alloys), due to their medium to high strength and high formability, have become the preferred materials for the new generation of lightweight vehicles. Aluminum alloy body panels go through three steps: natural aging pretreatment, stamping forming, and baking paint hardening. It is required to inhibit the natural aging of the alloy before stamping forming, and the rapid aging response in the baking paint stage after forming. In order to improve the strength of Al-Mg-Si aluminum alloys, the content of Mg, Si, and Cu elements is usually increased. However, this not only improves the strength of the natural aging of the alloy, but also reduces the formability of the automotive a...
Claims
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IPC IPC(8): C22C21/02C22C21/08C22C1/02C22F1/043C22F1/05
CPCC22C21/02C22C21/08C22C1/026C22F1/043C22F1/05
Inventor 聂宝华宋宇陈东初凡头文杜小青
Owner 云南律奥新技术开发有限公司