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A kind of preparation method of al-40%zn alloy twin dendrite

A twinning and alloying technology, which is applied in the field of preparation of Al-40%Zn alloy twin dendrites, can solve the problem that twin dendrites no longer form, and achieve the effect of low experimental cost, simple operation process and simple precipitated phase

Inactive Publication Date: 2018-12-04
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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Problems solved by technology

However, current studies have shown that when the Zn content reaches 40% in Al-Zn alloys, twin dendrites no longer form, which becomes a bottleneck in the preparation process of Al-Zn alloy twin dendrites.

Method used

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  • A kind of preparation method of al-40%zn alloy twin dendrite
  • A kind of preparation method of al-40%zn alloy twin dendrite
  • A kind of preparation method of al-40%zn alloy twin dendrite

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Embodiment 1

[0025] A kind of preparation method of Al-40%Zn alloy twin dendrite, this preparation method adopts a directional solidification device, such as figure 1 As shown, the directional solidification device includes a drawing rod 11, a heating and holding furnace 1 and an induction coil 2 located in its inner cavity, an inverted trapezoidal graphite sleeve 3, a cylindrical crucible 4 (high purity (99.9% Al 2 o 3 ) alumina corundum tube), "convex"-shaped connecting pipe 5, heat insulation sleeve 6, the small end of the connecting pipe 5 is adapted to the crucible 4, and the large end is adapted to the pull rod 11, heating the side wall of the holding furnace 1 Ar gas tube 7 and vacuum tube 8 are respectively connected with its inner cavity, Ar gas tube 7 is connected with Ar gas tank, vacuum tube 8 is connected with molecular pump and mechanical pump in turn, and the bottom of heating and holding furnace 1 is connected with crystallizer 9 with its sealing. 9 is filled with Ga-In-Sn...

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Abstract

The invention belongs to the field of preparation of metal materials, and particularly relates to a preparation method of an Al-40%Zn alloy twined dendritic crystal. According to the preparation method, the design that an Al-Zn alloy with high Zn content (40% Zn) is selected, a directional solidification technology is adopted, a high directional solidification drawing rate (900-1100[mu]m / s) is adopted, and a convection flow is formed in fusant during directional solidification, so that the Al-40%Zn alloy twined dendritic crystal is successfully prepared. According to the preparation method disclosed by the invention, the Al-40%Zn alloy is selected as the alloy system for preparing the twined dendritic crystal, and the alloy system selected in the method is different from an Al-Zn alloy system with low Zn content (30% or below) in a research report; and the component selection is not reported, so that technical bias is overcome.

Description

technical field [0001] The invention belongs to the field of preparation of metal materials, and in particular relates to a preparation method of Al-40%Zn alloy twin dendrites. Background technique [0002] Twin dendrites, also known as Feathery grains, also known as twin crystals, twin crystals, basalt-like crystals, etc., are a type of twins (Growth twin). Originally found in semi-continuous casting aluminum alloys, it is an abnormal grain completely different from common columnar grains and dendrites, and is called the third type of dendrites in casting. The reason why it is called feathery twin dendrites is that the morphology of such dendrites is similar to that of feathers in the two-dimensional microstructure. Studies have shown that twin dendrites are a kind of cast structure obtained under certain conditions, and their maximum growth speed is along the axial direction. Twin dendrites parallel to the axial direction have the strongest competitiveness, so dendrites i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/049B22D11/112C22C21/10
CPCB22D11/003B22D11/049B22D11/112C22C21/10
Inventor 高卡赵彪白中义宋文正刘军威郭晓琴张锐
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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