Composite refinement and modification method for improving mechanical performance of aluminium alloy

An aluminum alloy and mechanical technology, which is applied in the field of compound refinement and modification to improve the mechanical properties of A356.2 aluminum alloy, can solve the problems of expensive and limited rare earths, and achieve the effect of facilitating industrial production, easy operation, and low equipment requirements

Active Publication Date: 2017-04-05
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of rare earth, it is greatly restricted in practical application. Therefore, the compound addition of trace rare earth elements and other refinement modifiers has become the focus of research in recent years.

Method used

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  • Composite refinement and modification method for improving mechanical performance of aluminium alloy
  • Composite refinement and modification method for improving mechanical performance of aluminium alloy
  • Composite refinement and modification method for improving mechanical performance of aluminium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of materials: First, saw the A356.2 alloy ingot and cut it into small pieces of about 100g, rinse it with deionized water, then wash it with absolute ethanol and dry it, then put the Al-2Sc and Al-10Sr master alloys into Place the beaker filled with absolute ethanol in an ultrasonic cleaner and then dry it with ultrasonic vibration cleaning and set aside; (the following examples are the same and will not be described again)

[0029] Add 782.14g of A356.2 alloy ingot into a graphite crucible with a preheating temperature of 280°C, and then raise the temperature to 730°C. After the alloy is completely melted in a resistance furnace, skim off the surface scum, and put high-purity argon ( The volume percentage concentration is 99.99%) into the alloy liquid to about 1 / 4 of the bottom of the crucible for refining for 3 minutes; .2 The mass fraction of the alloy is 0.04%, and Sr accounts for 0.02% of the mass fraction of the A356.2 alloy) is wrapped with pure alumi...

Embodiment 2

[0032]774.27gA356.2 alloy ingot is melted in electric resistance furnace, add 24.86gAl-2Sc and 1.64gAl-10Sr intermediate alloy (Sc accounts for the mass fraction of A356.2 alloy is 0.06%, Sr accounts for the mass fraction of A356.2 alloy is 0.02%) as the refinement modificator, other parameters and operation steps are the same as embodiment one.

[0033] figure 1 a with figure 1 c are photographs of the metallographic structure of the A356.2 aluminum alloy prepared in this embodiment at 100 times and 500 times in the as-cast state, respectively. pass figure 1 a with figure 1 From the comparison of b, it can be seen that compared with the Al-Ti-B and Al-Sr refinement and modification most commonly used in factories at present, the A356.2 aluminum alloy secondary dendrites refined and modified by Al-Sc and Al-Sr The spacing is 20.09μm, which is 25.86% lower than the secondary dendrite spacing (27.1μm) of the traditional refined and modified A356.2 alloy, that is, its refinin...

Embodiment 3

[0035] 766.24gA356.2 alloy ingot is melted in electric resistance furnace, add 32.86gAl-2Sc and 1.63gAl-10Sr master alloy (Sc accounts for the mass fraction of A356.2 alloy is 0.08%, Sr accounts for the mass fraction of A356.2 alloy is 0.02%) as the refinement modificator, other parameters and operation steps are the same as embodiment one.

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Abstract

The invention discloses a composite refinement and modification method for improving mechanical performance of an aluminium alloy. The method comprises steps as follows: an alloy A356.2 is smelted and refined for 3-5 min; then an Al-2Sc intermediate alloy and an Al-10Sr intermediate alloy are sequentially added to an alloy liquid, wherein the mass percentage of Sc ranges from 0.02%-0.08%, the mass percentage of Sr ranges from 0.02%-0.03%, and the mass ratio of Sc to Sr ranges from 2:1 to 4:1; after the temperature is kept for 8-12 min, argon is introduced for refinement again for 3-5 min; and after the mixture is left to stand for 5-10 min, the refined and modified aluminium alloy A356.2 is obtained. With the method, traces of rare earth Sc and Sr elements are added to the aluminium alloy A356.2, and the ratio of Sc to Sr is reasonably designed, so that grains in the aluminium alloy A356.2 are remarkably reduced, and the relatively good refinement effect is realized. The tensile strength is up to 208.39 MPa and is 4% higher than that of an alloy treated with a traditional refinement and modification agent, and the ductility is up to 9.87% and is 26.2% higher than that of the alloy treated with the traditional refinement and modification agent.

Description

technical field [0001] The technical solution of the present invention belongs to the field of smelting and processing of aluminum alloy materials, specifically a compound refinement modification method for improving the mechanical properties of A356.2 aluminum alloy. Background technique [0002] In recent years, smog has become a problem that plagues people's lives, and one of the main culprits of smog is the emission of vehicle exhaust. One of the most effective ways to solve this problem is to reduce weight. Aluminum alloy has the advantages of light weight, good safety, high comfort, easy styling and fuel consumption saving, and has become the most ideal material of choice for lightweight vehicles today. A356.2 aluminum alloy has been used in the automobile industry soon after it came out due to its good casting performance and comprehensive mechanical properties. However, due to the existence of coarse columnar grains and dendrites in the as-cast structure of A356.2 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/04
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 赵维民李兴文丁俭夏兴川李其智
Owner HEBEI UNIV OF TECH
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