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Preparation method of Zn-Al-Ti intermediate alloy

An intermediate alloy and aluminum alloy technology, applied in the field of metal alloy materials, can solve the problems of unstable absorption of refined elements, inability to accurately control the addition amount, and increase in production costs.

Inactive Publication Date: 2012-12-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] It has been found that cerium, lanthanum, zirconium, manganese, titanium, strontium and other elements have a grain refinement effect on zinc-aluminum alloys. These elements are mainly aluminum-based master alloys (such as Al-Sr master alloys), salts (such as K 2 TiF 6 、K 2 ZrF 6 ), rare earth forms are added to the zinc-aluminum alloy to be refined, these refiners will have many problems in the actual use process: the melting temperature of rare earth and aluminum-based master alloy is much higher than the melting temperature of zinc-aluminum alloy, in order to refine If the zinc-aluminum alloy is melted into the zinc-aluminum alloy and distributed evenly, it is necessary to increase the melting temperature or prolong the holding time when refining, which will greatly increase the production cost; after the zinc-aluminum alloy is added to the aluminum-based master alloy refiner, the aluminum content will have a large increase. Changes, which may lead to some performance changes; the absorption of effective refinement elements after salts are added to the zinc-aluminum melt is unstable, so that the addition amount cannot be precisely controlled, and other salt compounds will be produced during the refinement process. Become inclusions in zinc-aluminum alloys and deteriorate their mechanical properties

Method used

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  • Preparation method of Zn-Al-Ti intermediate alloy
  • Preparation method of Zn-Al-Ti intermediate alloy
  • Preparation method of Zn-Al-Ti intermediate alloy

Examples

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Effect test

Embodiment 1

[0041] To prepare Zn-6.1wt.%Al-5wt.%Ti master alloy, according to the chemical composition of the master alloy, weigh Zn-10wt.%Al alloy and K 2 TiF 6 Powder the two raw materials to make K 2 TiF 6 It is 25.5% of the weight of zinc-aluminum alloy. Melt the Zn-10wt.%Al alloy to 600-780°C in a graphite clay crucible with a resistance furnace, and then add K 2 TiF 6 Add the powder to the surface of the Zn-10wt.%Al alloy melt in two batches, and then continue to keep warm for 2-15 minutes after adding it completely, and pour the upper oil melt in the crucible into the solidification mold to separate it from the lower alloy melt , the lower alloy melt is fully stirred and poured into another mold, and after cooling, the Zn-6.1wt.%Al-5wt.%Ti master alloy can be obtained. XRD ( figure 1 ) and SEM ( figure 2 ) analysis shows that the matrix of this alloy is mainly η-Zn, and TiAl with a size of 0.3-3 μm is dispersed in the matrix 3-x Zn x (0.4figure 2 shown in B).

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Embodiment 2

[0044] To prepare Zn-35wt.%Al-15wt.%Ti master alloy, according to its chemical composition, weigh Zn-48wt.%Al alloy and K 2 TiF 6 Powder the two raw materials to make K 2 TiF 6 It is 79% of the weight of Zn-48wt.%Al alloy. The Zn-48wt.%Al alloy was melted to 600-780°C in a graphite clay crucible with an induction furnace, and then K 2 TiF 6 Add the powder to the surface of the Zn-48wt.%Al alloy melt in four batches, and then continue to keep warm for 2-15 minutes after adding it completely, and pour the upper oil melt in the crucible into the solidification mold to separate it from the lower alloy melt , and then the lower alloy melt is fully stirred and poured into the mold. After cooling, the Zn-35wt.%Al-15wt.%Ti master alloy can be obtained. XRD ( Figure 5 ) and SEM ( Figure 6 ) analysis shows that the matrix of this master alloy is mainly η-Zn and α-Al, and TiAl with a size of 0.3-3 μm is dispersed in the Zn-Al matrix 3-x Zn x (0.4

Embodiment 3

[0046] To prepare Zn-27wt.%Al-6.2wt.%Ti master alloy, weigh Zn-32wt.%Al alloy and K 2 TiF 6 Powder the two raw materials to make K 2 TiF 6 It is 32% of the weight of Zn-32wt.%Al alloy. Melt the Zn-32wt.%Al alloy to 600-780°C in a graphite clay crucible with a power frequency induction furnace, and then add K 2 TiF 6 Add the powder to the surface of the Zn-32wt.%Al alloy melt in three batches, and then continue to keep warm for 2-15 minutes after adding it completely, and pour the upper oil melt in the crucible into the solidification mold to separate it from the lower alloy melt , and then the lower alloy melt is fully stirred and poured into the mold, and after cooling, the Zn-27wt.%Al-6.2wt.%Ti master alloy can be obtained. This master alloy matrix is ​​mainly η-Zn and α-Al ( Figure 7 , Figure 8 ), and TiAl with a diameter of mostly 0.3-3 μm is dispersed in the Zn-Al matrix 3-x Zn x (0.4 Figure 8 ). Adding this master alloy into the Zn-25Al alloy melt at 560°C ca...

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Abstract

The invention discloses a Zn-Al-Ti intermediate alloy comprising the following ingredients in percentage by weight: 2.94-40wt% of Al, 4-16wt% of Ti and the balance of Zn. The invention also discloses a preparation method of the intermediate alloy. After the prepared Zn-Al-Ti intermediate alloy is added into Zn-Al alloy to be refined, TiAl3-xZnx particles can directly serve as a nucleation core inthe primary alpha-Al crystal grain crystallization process in the Zn-Al alloy so as to achieve the purpose of refining the crystal grain. In addition, parts of TiAl3-xZnx particles are melted to release titanium atoms; and the primary alpha-Al crystal grain is refined by composition undercooling action. The preparation method disclosed by the invention is simple, the obtained intermediate alloy has efficient crystal grain refining action, and the alpha-Al crystal grain after Zn-Al alloy is solidified can be obviously refined.

Description

technical field [0001] The invention relates to a zinc-aluminum-titanium master alloy and a preparation method thereof. The prepared zinc-aluminum-titanium master alloy can be used to refine the grain structure of the zinc-aluminum alloy, and belongs to the technical field of metal alloy materials. Background technique [0002] Zinc-aluminum alloys with an aluminum content higher than 5wt.% have excellent mechanical and processing properties and have broad market application potential. However, this type of zinc-aluminum alloy tends to generate well-developed primary α-Al dendrites during the solidification process, resulting in shrinkage cavities, shrinkage porosity, and intragranular component segregation defects, resulting in a decline in mechanical properties and potential aging risks of products. In order to overcome the above problems, it is necessary to add a grain refiner to the zinc-aluminum alloy to refine the grains in actual production. [0003] It has been foun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C18/00C22C18/04C22C1/03
Inventor 王振卿杨中喜耿浩然
Owner UNIV OF JINAN
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