Ag-microalloyed rapid aging response type aluminum alloy and preparation method and application thereof
An aluminum alloy and aging treatment technology, applied in the field of metal materials, can solve problems such as limited strength improvement
Active Publication Date: 2021-03-19
FOSHAN UNIVERSITY
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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] Ingot No. group Mg Si Cu Ag mn Fe Al 1# Example 1 0.7 0.9 0.30 0.08 0.30 <0.5
margin 2# Example 2 0.6 1.0 0.30 0.1 0.20 <0.5
margin 3# Example 3 0.8 1.0 0.30 0.08 0.25 <0.5
margin 4# Comparative example 1 0.7 0.9 0.30 - 0.30 <0.5
margin 5# Comparative example 2 0.7 0.9 - 0.08 0.30 <0.5
margin
[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 temperatu...
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Abstract
The invention belongs to the technical field of metal materials, and discloses an Ag-microalloyed rapid aging response type aluminum alloy and a preparation method and application thereof. The Ag-microalloyed rapid aging response type aluminum alloy comprises, by weight percentage, 0.5-0.9% of Mg, 0.7-1.1% of Si, 0.2-0.6% of Cu, 0.15-0.4% of Mn, 0.05-0.1% of Ag and less than or equal to 0.5% of Fe. Based on the microalloying principle, the mass ratio of Mg to Si is optimally designed to be (0.75-1): 1, the mass ratio of Cu to (Mg + Si) is optimally designed to be (0.14-0.22): 1, the mass ratioof Ag to Cu is optimally designed to be (0.20-0.35): 1, a Ag-Cu-vacancy cluster is formed in the initial stage of pre-aging and serves as the nucleation and growth core of a varnish baking aging precipitated phase, through the precipitated phase / matrix interface Ag-Cu-vacancy cluster, precipitation of the Mg2Si phase and the Q phase (Al5Cu2Mg8Si6) is regulated and controlled, and rapid aging strengthening of the aluminum alloy in the varnish baking aging process is achieved; and after the alloy is pre-aged, the Ag-Cu-vacancy cluster is preferentially formed, the natural aging process of the alloy is more remarkably inhibited, and subsequent baking aging hardening is facilitated. The rapid aging response type aluminum alloy can be obtained through the preparation method, and is suitable for being applied to machining and production of automobile body structures.
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 FOSHAN UNIVERSITY