A kind of preparation method of high-strength Al-Si casting and forging alloy

An al-si and alloy technology, applied in the field of metal materials and preparation, can solve the problems of alloy deformation and mechanical performance limitation, poor deformation performance, limited strength, etc., and achieve the effect of strengthening alloy performance, increasing strength, and refining grains

Inactive Publication Date: 2018-10-02
HEFEI UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Although traditional Al-Si casting alloys can form more complex parts, they have limited strength, low performance and poor deformation performance
Under normal conditions, the eutectic silicon phase in the alloy structure is precipitated in the shape of needles, rods or laths, which is prone to stress concentration during the stress process, and there is a splitting effect on the matrix, which greatly affects the deformation and mechanical properties of the alloy. limit

Method used

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  • A kind of preparation method of high-strength Al-Si casting and forging alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In this embodiment, the method for preparing high-strength Al-Si cast-forging alloy by micro-alloying and warm-pressing process is as follows:

[0045] Step 1: Ingredients

[0046] According to the mass percentages of 95.24% Al, 3.5% Si, 0.50% Mg, 0.50% Cu, 0.21% Zr and 0.05% Sc in Table 1, weigh 736.3g pure aluminum (purity is 99.99%), 162.5gAl-21.54%Si Master alloy, 10gAl-50.38%Mg master alloy, 12.5gAl-39.97%Cu master alloy, 53.9gAl-3.9%Zr master alloy and 24.8gAl-2.02%Sc master alloy, the total mass of ingredients is 1000g;

[0047] Step 2: Melting and casting to prepare alloy ingots

[0048] 2a. Add the pure Al and Al-Si master alloy weighed in step 1 into the preheated crucible, the preheating temperature is 350°C, and then raise the temperature to 730°C together with the furnace, let it stand still and keep it warm for 25min after melting;

[0049] 2b. Add the Al-Cu master alloy and Al-Zr master alloy weighed in step 1 to the alloy melt obtained in 2a, let it st...

Embodiment 2

[0057] Refer to Example 1 for the preparation process of this example, the difference is the difference in the preparation parameters, see Table 1 for details.

[0058] The sample that embodiment 2 is made carries out performance analysis:

[0059] The tensile strength of the sample measured by "50KN SANS CMT-5105 electronic universal testing machine" reached 325.7MPa.

Embodiment 3

[0061] Refer to Example 1 for the preparation process of this example, the difference is the difference in the preparation parameters, see Table 1 for details.

[0062] The sample that embodiment 3 is made carries out performance analysis:

[0063] The tensile strength of the sample measured by "50KN SANS CMT-5105 electronic universal testing machine" reached 311.9MPa.

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Abstract

The invention discloses a method for high-strength Al-Si casting-forging alloy preparation through microalloying and warm compaction process recombination. On the basis of components of a traditional Al-Si casting-forging alloy, a minute amount of elements including Mg, Cu, Zr and rare earth Sc are added for alloying modification; and casting ingots are obtained through smelting casting and then subjected to warm compaction treatment under the proper temperature and strain rate so as to prepare a high-strength Al-Si casting-forging alloy. Compared with the Al-Si casting alloy produced through a current traditional process, the high-strength Al-Si casting-forging alloy prepared through the method is remarkably improved in performance, the process method adopted for high-strength Al-Si casting-forging alloy preparation is simple and easy to achieve, the production cost is low, very wide production and application prospects are achieved in the field of aviation, spaceflight, car and machinery manufacturing, and the method is suitable for extensive industrialization.

Description

technical field [0001] The invention relates to a method for compositely preparing high-strength Al-Si casting and forging alloys by adopting microalloying and warm-pressing techniques, and belongs to the technical field of metal materials and preparation. Background technique [0002] In the fields of aerospace and automobiles, it is a long-term pursuit of people to reduce weight under the condition of ensuring strength to save materials and reduce energy consumption during operation, and it is also one of the trends in the development of modern advanced manufacturing technology. Aluminum alloy with low density and high specific strength has become the first choice as an excellent lightweight structural material. [0003] Cast aluminum alloy has the advantages of excellent mechanical properties, casting molding performance, and high production efficiency, so it has been widely valued by researchers at home and abroad. Among them, Al-Si alloy has become the most widely cast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C1/03C22C1/06C22F1/043
CPCC22C1/026C22C1/03C22C1/06C22C21/02C22F1/043
Inventor 杜晓东张雅李玉坤吴玉程雷璇璇葛海涛
Owner HEFEI UNIV OF TECH
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