A kind of al-ti-c-nd master alloy and its preparation method and application

An al-ti-c-nd, master alloy technology, applied in the field of Al-Ti-C-Nd master alloy and its preparation, can solve the problems of poor TiC particle forming effect, large dosage, poor wettability, etc. The effect of reaction time

Active Publication Date: 2019-03-29
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] However, due to the poor wettability of C in Al, the forming effect of TiC particles in the Al-Ti-C master alloy is poor. Therefore, in order to obtain a good refining effect, the amount of Al-Ti-C master alloy is relatively large. When Al-Ti-C master alloy is used for refining aluminum alloy, when the addition amount is 0.5%, the grain is refined to 150μm

Method used

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  • A kind of al-ti-c-nd master alloy and its preparation method and application
  • A kind of al-ti-c-nd master alloy and its preparation method and application
  • A kind of al-ti-c-nd master alloy and its preparation method and application

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preparation example Construction

[0038] The present invention also provides a method for preparing the Al-Ti-C-Nd master alloy described in the above technical solution, comprising the following steps:

[0039] Aluminum powder, titanium powder, carbon powder and Nd 2 o 3 The powder is mixed and pressed into a mixed powder block;

[0040] Heat metal aluminum until it is completely melted to obtain aluminum melt;

[0041] Pressing the mixed powder block into the aluminum melt for thermal explosion reaction and then pouring to obtain Al-Ti-C-Nd master alloy.

[0042] The present invention will aluminum powder, titanium powder, carbon powder and Nd 2 o 3 The powders are mixed and pressed into a mixed powder block. In the present invention, the molar ratio of the aluminum powder, titanium powder and carbon powder is preferably 5:(1.5-2.5):(0.8-1.2), more preferably 5:(1.8-2.2):(0.9-1.1) ; The Nd 2 o 3 The mass of powder is preferably 2-6% of the total mass of aluminum powder, titanium powder and carbon powde...

Embodiment 1

[0067] Aluminum powder with a particle size of 250 mesh, titanium powder with a particle diameter of 350 mesh, graphite powder with a particle diameter of 440 mesh and Nd powder with a particle diameter of 320 mesh 2 o 3 The powder was mixed in a planetary ball mill at a rate of 600 rpm for 90 minutes according to a ratio of 5:2:1 to obtain a mixed powder, which was then compressed into a mixed powder block with a diameter of 25 mm under a pressure of 50;

[0068] Heat the aluminum ingot to 800°C to completely melt the aluminum ingot to obtain an aluminum melt;

[0069] According to the proportion of Ti mass content in the master alloy obtained after the reaction is 5%, the mixed powder block is pressed into the aluminum melt at 800 ° C, and the thermal explosion reaction is carried out for 3 minutes, and then the alloy melt is allowed to stand at 800 ° C for 4 minutes, Then stir for 1 min at a rate of 1 min / time to obtain an alloy melt;

[0070] Adding 1.5% C to the alloy m...

Embodiment 2

[0076] Heating industrial pure aluminum to 730°C to remove slag after it is completely melted;

[0077] Add the Al-Ti-C-Nd master alloy prepared in Example 1 into the molten aluminum at a ratio of 0.2% by weight, stir for 1 min at a rate of 1 min / time, and then keep it warm for 5 min before casting at 730°C to obtain a refinement effect Good pure aluminum.

[0078] Carry out microstructure observation to the pure aluminum after present embodiment refinement, obtain picture as Figure 6 It can be seen from the figure that the structure is a fine equiaxed crystal structure with a size of 150-180 μm.

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Abstract

The invention provides an Al-Ti-C-Nb intermediate alloy as well as a preparation method and application thereof. The Al-Ti-C-Nb intermediate alloy provided by the invention comprises the following alloy elements in percentage by mass: 1.0-5.0% of Ti, 0.5-2.0% of C and 0.5-2.0% of Nd. By the addition of 0.5-2.0% of Nd, the forming effect of TiC is improved, so that the prepared Al-Ti-C-Nb intermediate alloy has an excellent refining effect. Experimental results prove that when the Al-Ti-C-Nb intermediate alloy provided by the invention is used for refining pure aluminum, a fine equiaxial crystal structure can be obtained by virtue of the addition amount of 0.2wt%, and the grain size is 150-180 microns; and when the intermediate alloy is used for refining hypoeutectic aluminum-silicon alloys, thick dendrite can be enabled to become a fine equiaxial crystal structure of 20-50 microns by virtue of the addition amount of 0.5wt%, and the eutectic silicon is changed from a thick strip form to a fine short-rod or granular structure of 5-10 microns.

Description

technical field [0001] The invention relates to the technical field of alloy refinement, in particular to an Al-Ti-C-Nd master alloy and its preparation method and application. Background technique [0002] To produce high-quality aluminum alloy, it is very necessary to control the ingot structure. The grain refinement of aluminum in the aluminum alloy not only improves the mechanical properties, but also improves the airtightness of the casting due to the compact structure, which is especially important for pressure-resistant parts. The most common and effective way to refine the grain size is to add a nucleating agent to the melt before casting, and to refine the grains through heterogeneous nucleation during the solidification of aluminum. This method is called casting in the industry. Ingot grain refinement treatment. Adding an intermediate alloy to the alloy can not only refine the as-cast grains and dendrite structure, but also reduce porosity, reduce hot cracking te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/10
CPCC22C1/1036C22C21/00
Inventor 丁万武张海霞赵文军郭廷彪李庆林徐仰涛夏天东
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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