A kind of rheological preparation method of aluminum-zinc alloy melt

A melt rheology and alloy technology, applied in the field of metal melt processing, can solve the problems of limited application scope, easy occurrence of hot cracking, poor casting performance, etc., and achieves high preparation efficiency, improved casting performance, and good fluidity. Effect

Active Publication Date: 2020-05-01
SHANGHAI WANTAI AUTO PARTS
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Problems solved by technology

[0003] Aluminum-zinc alloy (Al-Zn alloy) is an important category of aluminum alloys. From the Al-Zn alloy binary phase diagram, it can be seen that Zn has a large solid solubility in Al, and its biggest feature is its natural aging characteristics. , that is, no heat treatment is required after casting, but high strength can be obtained through natural aging, but the disadvantage is that its casting performance is poor and it is prone to hot cracking
Therefore, Al-Zn alloys are mostly used in the manufacture of instrument housings and other detection parts that require high precision, resulting in limited application range of current Al-Zn alloys and high production costs. Existing Al-Zn alloy preparation processes exist Can be improved

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  • A kind of rheological preparation method of aluminum-zinc alloy melt
  • A kind of rheological preparation method of aluminum-zinc alloy melt
  • A kind of rheological preparation method of aluminum-zinc alloy melt

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Effect test

Embodiment 1

[0039] Such as figure 1As shown, a rheological preparation method of an aluminum-zinc alloy melt is suitable for binary or multi-element Al-Zn alloys with a Zn content of 1-30wt%, in this embodiment it is an Al-2Si-1Zn (mass fraction) alloy , which includes the smelting process of the previous process and the rheological melt processing process of the post-process. The smelting process melts and uniformly stirs each alloy masterbatch to obtain an alloy melt, and then the alloy melt undergoes a rheological melt processing process. The dendrites are broken into a near-spherical microstructure and a melt slurry with a certain solid phase ratio is prepared. The primary phase of the melt slurry is round and uniform, which can maximize the advantages of semi-solid processing technology and improve the casting performance and mechanical properties of aluminum-zinc alloys. It can be directly used for casting molding of subsequent castings, and can also be used for thixotropy Shaped a...

Embodiment 2

[0046] A rheological preparation method of an aluminum-zinc alloy melt, which is different from Embodiment 1 in that the time factor of the smelting process is changed, and the preferred temperature and mechanical stirring conditions of the rheological melt processing process are different.

[0047] In the smelting process, firstly, each alloy masterbatch is preheated in the temperature range of 100-200°C, and the preheating time is more than two hours, and then each alloy masterbatch is melted in a crucible resistance furnace or other industrial electric furnace, and waited for each After the alloy masterbatch is melted, stir evenly at 680°C and let it stand for 20 minutes, then add refining agent to the alloy melt, and refine at 660°C for 15 minutes, and finally clean up the waste slag in the alloy melt ( That is, slag removal) and stand still for 20 minutes, so as to complete the pre-process operation in the rheological preparation process of aluminum-zinc alloy melt. In th...

Embodiment 3

[0050] A rheological preparation method of an aluminum-zinc alloy melt, the difference from Embodiment 1 lies in: the time change of the smelting process, the preferred temperature and the mechanical stirring conditions of the rheological melt processing process.

[0051] In the smelting process, firstly, each alloy masterbatch is preheated in the temperature range of 100-200°C, and the preheating time is more than two hours, and then each alloy masterbatch is melted in a crucible resistance furnace or other industrial electric furnace, and waited for each After the alloy masterbatch is melted, stir evenly at 680°C and let it stand for 10 minutes, then add refining agent to the alloy melt, and refine at 660°C for 20 minutes, and finally clean and remove the waste slag in the alloy melt (that is, slag removal) and stand still for 20 minutes, so as to complete the pre-process process in the rheological preparation process of aluminum-zinc alloy melt. In the rheological melt proc...

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Abstract

The invention discloses a rheological preparation method of an aluminum-zinc alloy melt, and relates to the field of metal melt processing. The method is applicable to preparation of binary or multi-component Al-Zn series alloys containing 1-30wt% of zinc. The method comprises a previous smelting technology process and a following rheological melt processing process, wherein the smelting technology process comprises the following steps: smelting of master batches; mixing and stirring; standing; refining; and slag removal and standing; the rheological melt processing process comprises the following steps: selecting optimal solid-liquid two-phase temperature interval; and carrying out mechanical stirring. According to the method, the optimal rheological processing temperature interval is selected, and branch crystals are effectively mechanically broken, so that the branch crystals can be nucleated again and multiplied; and meanwhile, the crystal gain ageing mechanism of a primary phase is started under microcosmic expansion effect of the melt so as to form spherical particles, and as a result, the purpose of improving the casting performance of the aluminum-zinc alloy is achieved, and the technical difficulties such as limited applicable scope and high production cost of the Al-Zn alloy can be solved.

Description

technical field [0001] The invention relates to the field of metal melt processing, in particular to a rheological preparation method of an aluminum-zinc alloy melt. Background technique [0002] Since the beginning of the 21st century, with the continuous deepening of the country's development concept of energy saving, environmental protection, weight reduction and emission reduction, aerospace, transportation and other industries have gradually put forward higher requirements for lightweight materials and components. Aluminum alloy is widely used in aerospace, automobile, electronics and other fields because of its low density, high specific strength, good thermal and electrical conductivity, and easy refining and processing. [0003] Aluminum-zinc alloy (Al-Zn alloy) is an important category of aluminum alloys. From the Al-Zn alloy binary phase diagram, it can be seen that Zn has a large solid solubility in Al, and its biggest feature is its natural aging characteristics....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/10
CPCC22C1/026C22C1/03C22C21/10
Inventor 胡志恒张发展张志强
Owner SHANGHAI WANTAI AUTO PARTS
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