A method for obtaining fine primary α-al equiaxed grains in zinc-aluminum alloys

An equiaxed grain and aluminum alloy technology, applied in the field of alloy materials, can solve the problems of weakened grain refinement effect and limited grain refinement effect of primary α-Al

Inactive Publication Date: 2019-01-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under ordinary production conditions, the zinc-aluminum-zirconium master alloy has a limited effect on the grain refinement of primary α-Al, and the final primary α-Al grain morphology is still petal-like with branches and the grain size Still up to tens of microns, and the grain refinement effect will be further weakened when the pouring temperature increases

Method used

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  • A method for obtaining fine primary α-al equiaxed grains in zinc-aluminum alloys
  • A method for obtaining fine primary α-al equiaxed grains in zinc-aluminum alloys
  • A method for obtaining fine primary α-al equiaxed grains in zinc-aluminum alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the Zn-34 wt.%Al alloy (the mass percentage of Zn in the alloy is 66%, the mass percentage of Al is 34%, and the wt.% is omitted below, that is, Zn-34Al) (the liquidus temperature is 530°C) The method for obtaining spherical or polyhedral fine primary α-Al equiaxed grains, the steps are as follows:

[0027] Step S110, preparing Zn-31.9Al-6Ce-0.3Mg master alloy, the steps are as follows:

[0028] Step S111, mixing pure Zn, pure Al, pure Mg and Al-20Ce master alloy to obtain a Zn-Al-Ce-Mg mixed raw material, wherein the mass ratio of Zn and Al in the Zn-Al-Ce-Mg mixed raw material is equal to The mass ratio (66:34) of Zn and Al in Zn-Al alloy is the same.

[0029] Step S112, put the Zn-Al-Ce-Mg mixed raw material in a crucible, heat it to 700-750°C and melt it completely, keep it warm for 15-30 minutes, then stir it fully, pour it into a mold, and cool it to get Zn-31.9 Al-6Ce-0.3Mg master alloy.

[0030] In step S120, a Zn-32Al-6Zr master alloy is prepared accordin...

Embodiment 2

[0035] The method for obtaining spherical or polyhedral fine primary α-Al equiaxed grains in Zn-34Al alloy (liquidus temperature is 530°C), the steps are as follows:

[0036] Step S210, preparing Zn-31.9Al-6Ce-0.3Mg master alloy, the preparation steps are the same as the method provided in Example 1, and will not be repeated here.

[0037] In step S220, a Zn-32Al-6Zr master alloy is prepared according to the prior art, which will not be repeated here.

[0038] Step S230, melting the Zn-34Al alloy to 700° C. to obtain a Zn-34Al alloy melt.

[0039] In step S240, simultaneously add the Zn-31.9Al-6Ce-0.3Mg master alloy prepared in step S210 and the Zn-32Al-6Zr master alloy prepared in step S220 into the Zn-34Al alloy melt, and continue to keep warm for 8-20 minutes, fully Stir to make Zr, Ce, and Mg elements evenly distribute in the Zn-34Al alloy melt to obtain the final alloy melt, wherein the contents of Zr, Ce, and Mg elements in the final alloy melt are 0.1wt.%, 0.1wt.%, res...

Embodiment 3

[0042]The method for obtaining spherical or polyhedral fine primary α-Al equiaxed grains in Zn-34Al alloy (liquidus temperature is 530°C), the steps are as follows:

[0043] In step S310 , preparing a Zn-31.9Al-6Ce-0.3Mg master alloy, the preparation steps are the same as the method provided in Example 1, and will not be repeated here.

[0044] In step S320, a Zn-32Al-6Zr master alloy is prepared according to the prior art, which will not be repeated here.

[0045] Step S330, melting the Zn-34Al alloy to 700° C. to obtain a Zn-34Al alloy melt.

[0046] In step S340, the Zn-31.9Al-6Ce-0.3Mg master alloy prepared in step S310 and the Zn-32Al-6Zr master alloy prepared in step S320 are simultaneously added to the Zn-34Al alloy melt, and the heat preservation is continued for 8-20 minutes, fully Stir to make the Zr, Ce, and Mg elements evenly distributed in the Zn-34Al alloy melt to obtain the final alloy melt, wherein the contents of Zr, Ce, and Mg elements in the final alloy mel...

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Abstract

The invention discloses a method for obtaining fine primary alpha-Al equiaxed grains in a zinc-aluminum alloy. The method comprises the steps of melting the zinc-aluminum alloy to 100-200 DEG C above the liquidus line so as to obtain a zinc-aluminum alloy melt; simultaneously adding zirconium, cerium and magnesium elements into the zinc-aluminum alloy melt, continuously keeping the temperature for 8-20 minutes and carrying out efficient stirring to enable the zirconium, cerium and magnesium elements to be uniformly distributed in the zinc-aluminum alloy melt so as to obtain the final alloy melt; and pouring the final alloy melt into a mold, and carrying out cooling so as to obtain the zinc-aluminum alloy containing the fine primary alpha-Al equiaxed grains. The method has the advantage that the obtained fine unramified spherical or polyhedral alpha-Al axial grains can generate the advantageous effect on the optimization, the casting processing performance and the use performance of the structure of the zinc-aluminum alloy.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and relates to the solidification process control and grain refinement treatment of zinc-aluminum alloys, in particular to a method for obtaining spherical or polyhedral fine primary α-Al equiaxed grains in zinc-aluminum alloys. Background technique [0002] Metal grains in metal or alloy castings mainly exist in the following three forms: branched dendritic grains, spherical or polyhedral unbranched equiaxed grains (hereinafter referred to as equiaxed grains) and two-dimensionally long columnar grains. Among them, equiaxed grains are most beneficial to obtain ideal metal or alloy structure and properties, and measures are often taken in production to suppress the formation of dendrite grains and columnar grains as much as possible, so as to transform them into equiaxed grains. The finer the grain size, the more conducive to the improvement of alloy casting process performance and mechan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C18/04
CPCC22C1/03C22C18/04
Inventor 王振卿国京元姜坤杜壮袁震
Owner UNIV OF JINAN
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