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A time process of AL-SI-MG-ZR-TI-SC alloy

A technology of al-si-mg-zr-ti-sc and al-sc is applied in the field of aging process, which can solve the problems of destroying coherence, reducing the effect of aging hardening, and not giving full play to the role of alloys.

Active Publication Date: 2020-08-07
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the aging of this alloy adopts the single-stage aging method, that is, after solution treatment, it is kept at about 150°C for about 200 minutes. The disadvantage is that it is directly aged at a higher temperature without aging at a low temperature, and the density of the aging precipitated phase is low. , the size is not uniform, and it is easy to destroy its coherence with the matrix during aging, which reduces the effect of age hardening and does not give full play to the role of trace elements in the alloy

Method used

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  • A time process of AL-SI-MG-ZR-TI-SC alloy

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Experimental program
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Embodiment 1

[0023] This embodiment prepares the alloy according to the following steps:

[0024] Step 1: Prepare an alloy ingot.

[0025] (1) Ingredients: Weigh pure Al, Al-Si master alloy, Al- Mg master alloy, Al-Zr master alloy, Al-Ti master alloy and Al-Sc master alloy.

[0026] (2) Melting: first add the Al-Si master alloy and pure aluminum into the crucible preheated to 300°C, raise the temperature to 750°C with the furnace, and keep it for 20 minutes after melting; put the Al-Mg master alloy and Al-Ti master alloy , Al-Zr master alloy and Al-Sc master alloy (wrapped and added with aluminum foil) were added to the melt, and kept for 10 minutes after melting; stirred after all melted, and kept for 10 minutes;

[0027] (3) Refining: adjust the temperature to 720°C, quickly skim off the scum on the surface of the melt with a slag skimmer, and use a bell jar to remove the refining agent (C 2 Cl 6 , accounting for 0.6% of the total amount) placed at the bottom of the melt, refining an...

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Abstract

The invention discloses an aging process for an Al-Si-Mg-Zr-Ti-Sc alloy. The aging process is characterized in that alloy potential is fully exploited through two-stage aging treatment in order to improve the mechanical performance of the alloy. The Al-Si-Mg-Zr-Ti-Sc alloy is prepared from the following components in percentage by mass: 6.5 percent of Si, 0.35 percent of Mg, 0.2 percent of Ti, 0.25 percent of Zr, 0.01 percent of Sc and the balance of aluminum. By adopting the aging process, two-stage aging is adopted for the alloy, and a reasonable smelting-casting process is adopted, so thata structure in which a second-phase particle in distributed in dispersion and is fine in grains and keeps a coherent relationship with a substrate is formed, and the comprehensive mechanical performance of the alloy is improved.

Description

technical field [0001] The invention relates to an aging process of an Al-Si-Mg-Zr-Ti-Sc alloy and belongs to the technical field of non-ferrous metal aluminum-based alloys. Background technique [0002] In today's society, energy saving, environmental protection and safety have become the pursuit of people's life. With the improvement of people's living standards, the number of cars is increasing day by day. Nowadays, automotive lightweight technology has become a research hotspot in the automotive field. There are two main ways to realize the lightweight of automobiles: one is to improve the structural design of automobiles; the other is to develop new materials. The Al-Si-Mg series aluminum alloy has the advantages of good casting fluidity, good air tightness, small shrinkage rate and small hot cracking tendency. After heat treatment, the alloy has good machinability and other advantages, and has a wide range of applications. Adding a small amount of Zr and Ti can effe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/043C22C21/02C22C1/03
CPCC22C1/026C22C1/03C22C21/02C22F1/043
Inventor 杜晓东董浩陆雨赵强时运雷璇璇葛海涛
Owner HEFEI UNIV OF TECH