WO2016177095A1

WO2016177095A1 - Aluminium alloy material and preparation method therefor

Info

Publication number: WO2016177095A1
Application number: PCT/CN2016/076070
Authority: WO
Inventors: 刘金; 杨洪亮
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-10-10
Filing date: 2016-03-10
Publication date: 2016-11-10
Also published as: CN106566959A; CN106566959B

Abstract

Provided are an aluminium alloy material and a preparation method therefor, and the aluminium alloy material comprises silicon, iron, zinc, nickel, aluminium and impurities, wherein the mass percentages of silicon, iron, zinc and nickel are respectively 2%-4% of silicon, 0.01%-0.8% of iron, 0.01%-3% of zinc and 0.01%-3.5% of nickel, the mass percentage of the impurities does not exceed 0.3%, and the balance is aluminium. The method comprises alloy melting and casting moulding steps, and at least one of Al-Sr, Al-V and Al-Zr intermediate alloys is added during the alloy melting step. The aluminium alloy material and the preparation method therefor are used to solve the problems of poor thermal conductivity and poor mechanical property of the aluminium alloy material in the relevant technology.

Description

Aluminum alloy material and preparation method thereof

Technical field

The application relates to, but is not limited to, the field of metal materials, and in particular to an aluminum alloy material and a preparation method thereof.

Background technique

Because aluminum alloy material has the characteristics of good processing performance, light specific gravity, beautiful surface, excellent corrosion resistance, high production efficiency and low cost, it is the preferred material for mass production. Therefore, aluminum alloy materials have obtained a large number of applications in many industries such as automobiles, electronics, communications, and aerospace. Although there are many types of aluminum alloys, there are fewer types of aluminum alloys used for die casting, especially those with high thermal conductivity. At present, the thermal conductivity of the current die-cast aluminum alloy such as ADC12 in the as-cast state is about (96-110) W / (m · K), and AlSi12 is about 121 W / (m · K) in the as-cast state. ADC1 (LM6) belongs to The die-casting aluminum alloy with castability deviation has a thermal conductivity of about 142 W/(m·K). It is already a material with high thermal conductivity in die-cast aluminum alloy, but it is pure relative to the thermal conductivity of 230 W/(m·K). There is still a big gap between aluminum and deformed aluminum alloy 6063 with a thermal conductivity of up to 192 W/(m·K). Moreover, most of the die-casting parts have many defects such as internal pores, and heat treatment cannot solve the problem.

In recent years, in order to obtain high-heat-conducting aluminum alloys suitable for die-casting, a large number of studies have been carried out at home and abroad. NIKKEI MC ALUMINIUM has developed Al-2Ni-Fe die-casting aluminum alloys with a thermal conductivity of 190 W/(m·K in the as-cast state. ), but the casting performance is more than 35% lower than ADC12, and its hardness is low and its strength is low.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the invention provides an aluminum alloy material which has good casting performance and mechanical properties and high thermal conductivity.

Embodiments of the present invention provide an aluminum alloy material.

The technical solution adopted by the embodiment of the present invention is:

An aluminum alloy material includes silicon, iron, zinc, nickel, aluminum and impurities, and the mass percentages of silicon, iron, zinc and nickel are respectively 2-4% of silicon, 0.01-0.8% of iron, 0.01-3% of zinc and 0.01 of nickel. ～3.5%, the impurity mass percentage does not exceed 0.3%, and the rest is aluminum;

Optionally, the aluminum alloy material further comprises at least one of cerium, zirconium and vanadium;

Alternatively, the mass percentage of cerium, zirconium and vanadium is 0.001 to 0.2%, zirconium 0.001 to 0.2%, and vanadium 0.001 to 0.2%.

In addition, an embodiment of the present invention further provides a method for preparing the above aluminum alloy material, comprising the following steps: alloy melting and casting molding;

Alternatively, at least one of Al-Sr, Al-V, and Al-Zr intermediate alloys is added to the alloy when it is melted.

The utility model has the advantages that the aluminum alloy provided by the technical solution of the present application has good casting performance and can be used for a thin-walled shell with a complicated die-casting structure, and the heat-transducing rate of the die-casting part produced by the method is higher than 196 W/(m·K under normal temperature conditions. ), the tensile strength is not less than 180MPa, the thermal conductivity is excellent, and the mechanical properties are more prominent.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a table of composition of an aluminum alloy material according to an embodiment of the present invention;

2 is a performance table of an aluminum alloy material according to an embodiment of the present invention;

Embodiments of the invention

The present application will be described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting.

Three aluminum alloy forming ratios of the embodiments of the present invention are provided in FIG.

The composition of the aluminum alloy material in the first embodiment is 2.09 wt% silicon, 0.06 wt% iron, 2.96 wt% nickel, 1.53 wt% zinc, 0.05 wt% bismuth, the balance being aluminum and impurities, and the impurity mass percentage does not exceed 0.3%.

The preparation method of the corresponding aluminum alloy material of the first embodiment is as follows:

Step 1: According to 2.09wt% silicon, 0.06wt% iron, 2.96wt% nickel, 1.53wt% zinc, 0.05wt% bismuth, the balance is aluminum, weigh the ingredients according to the total weight of 99.5Kg, and prepare 0.5 Kg of Al-10Sr master alloy.

Step 2: Preheat the crucible. When the temperature reaches 300 °C or higher, add aluminum, zinc, silicon, and iron to melt. When the temperature rises above 780 °C, add nickel and niobium, and keep the temperature within 680-850 °C. After the feed was melted, the Al-10Sr master alloy was added, and after it was completely melted, the solution temperature was adjusted to 700 ± 10 ° C, and refined with a general-purpose aluminum alloy refining agent for 10 min. After refining, remove the solvent and scum from the liquid surface. Then let stand for 5 min to make the inclusions fully float or sink, and slag.

Step 3: After adjusting the solution to 680-720 ° C, the aluminum alloy melt is poured into a high-pressure die-casting machine for die-casting production.

The composition of the aluminum alloy material in the second embodiment is 3.08 wt% silicon, 0.07 wt% iron, 2.58 wt% nickel, 1.71 wt% zinc, 0.05 wt% zirconium, and the balance is aluminum and impurities, and the impurity mass percentage does not exceed 0.3%.

The preparation method of the corresponding aluminum alloy material of the second embodiment is as follows:

Step 1: According to 3.08wt% silicon, 0.07wt% iron, 2.58wt% nickel, 1.71wt% zinc, 0.05wt% zirconium, the balance is aluminum and impurities, the impurity mass percentage does not exceed 0.3%, according to the total Weighing 99Kg of ingredients, while preparing 1Kg of Al-5Zr master alloy.

Step 2: Preheat the crucible. When the temperature reaches 300 °C or higher, add aluminum, zinc, silicon and iron to melt. When the temperature rises above 780 °C, add nickel and zirconium and keep the temperature within 680-850 °C. After the feed was melted, the Al-5Zr master alloy was added, and after the whole was melted, the temperature of the solution was adjusted to 700 ± 10 ° C, and argon gas was refined by GBF (Gas Bubbling Filtration) for 8 min. After refining, remove the solvent and scum from the liquid surface. Then let stand for 10 min to make the inclusions fully float or sink, and slag.

Step 3: After adjusting the solution to 680-720 ° C, the aluminum alloy melt is subjected to semi-solid pulping treatment and then poured into a die-casting machine for die-casting production.

The composition of the aluminum alloy material in the third embodiment is 3.79 wt% silicon, 0.08 wt% iron, 1.21 wt% nickel, 2.50 wt% zinc, 0.11 wt% vanadium, the balance being aluminum and impurities, wherein the impurity quality The percentage does not exceed 0.3%.

The preparation method of the three-phase corresponding aluminum alloy material of the embodiment is as follows:

Step 1: According to 3.79 wt% silicon, 0.08 wt% iron, 1.21 wt% nickel, 2.50 wt% zinc, 0.11 wt% vanadium, the balance being aluminum and impurities, wherein the impurity mass percentage does not exceed 0.3%, The ingredients were weighed at a total weight of 100 Kg while preparing a 0.2 Kg Al-55V master alloy.

Step 2: preheating 坩埚, when the temperature reaches 300 ° C or more, aluminum, zinc, silicon, iron, vanadium, Al-55V intermediate alloy is sequentially added for melting. When the temperature rises above 780 ° C, nickel, manganese and copper are added. After all of it was melted, the temperature of the solution was adjusted to 700 ± 10 ° C, and nitrogen gas refining was carried out for 12 min by GBF (bubble filtration). After refining, remove the solvent and scum from the liquid surface. Then, it was allowed to stand for 12 minutes to make the inclusions fully float or sink, and slag.

Step 3: After adjusting the solution to 680-700 ° C, the aluminum alloy melt is poured into a high-pressure die-casting machine for die-casting production.

Figure 2 is a graph showing the performance parameters of the aluminum alloy materials prepared in the above three examples.

In order to test the thermal conductivity of the aluminum alloy prepared in the examples, according to the ASTM E1461 standard, a disc having a diameter of 12.7 mm and a thickness of 2 mm was cut on the aluminum alloy parts prepared in the first to third examples for the thermal conductivity test. The samples are all as-cast samples, and the experimental equipment is the German NETZSCH laser thermal conductivity tester. At the same time, according to the national standard GB/T 228, the bulk sample plate samples are used for mechanical performance test. The test samples are all as-cast samples, and the test equipment is a tensile test machine.

The performance parameters of the aluminum alloy material in the first embodiment are tensile strength of 175.7 MPa, elongation after fracture of 4.2%, and thermal conductivity of 209.3 W/(m·K).

The performance parameters of the aluminum alloy material in the second embodiment are tensile strength 193.9 MPa, elongation after fracture 3.9%, and thermal conductivity 206.5 W/(m·K).

The performance parameters of the aluminum alloy material in the third embodiment are tensile strength 203.2 MPa, elongation after fracture 3.8%, and thermal conductivity 196.8 W/(m·K).

While the preferred embodiment of the present application has been disclosed for illustrative purposes, those skilled in the art will recognize that various modifications, additions and substitutions are possible. Therefore, the scope of the present application should not be limited to the embodiments described above.

Industrial applicability

The embodiment of the invention provides an aluminum alloy material and a preparation method thereof. The aluminum alloy material has good casting performance and can be used for a thin-walled shell with a complicated die-casting structure, and the heat-transfer rate of the die-casting part produced under normal temperature conditions It is more than 196W/(m·K), the tensile strength is not less than 180MPa, the thermal conductivity is excellent, and the mechanical properties are more prominent.

Claims

An aluminum alloy material comprising silicon, iron, zinc, nickel, aluminum and impurities. The mass percentages of silicon, iron, zinc and nickel are respectively 2-4% of silicon, 0.01-0.8% of iron, 0.01-3% of zinc and nickel. 0.01 to 3.5%, the impurity mass percentage does not exceed 0.3%, and the balance is aluminum.
The aluminum alloy material according to claim 1, further comprising at least one of cerium, zirconium and vanadium.
The aluminum alloy material according to claim 2, wherein the mass percentage of the cerium, zirconium and vanadium is 0.001 to 0.2%, zirconium 0.001 to 0.2%, and vanadium 0.001 to 0.2%.
A method of preparing an aluminum alloy material according to any one of claims 1 to 3, comprising an alloy melting and casting forming step, wherein an Al-Sr, Al-V and Al-Zr intermediate alloy is added to the alloy melting step At least one of them.