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Die-casting magnesium alloy and preparation method thereof

An alloy and casting magnesium technology, which is applied in the field of die-casting magnesium alloy and its preparation, can solve the problems that the mechanical properties of Mg-Al alloys, thermal conductivity and casting process performance cannot be taken into account.

Inactive Publication Date: 2021-03-19
GUANGDONG INST OF MATERIALS & PROCESSING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the problem that the mechanical properties, thermal conductivity and casting process performance of Mg-Al alloys cannot be balanced, and to provide a die-casting magnesium alloy with medium strength, high plasticity, high thermal conductivity and high fluidity and its preparation method

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  • Die-casting magnesium alloy and preparation method thereof
  • Die-casting magnesium alloy and preparation method thereof
  • Die-casting magnesium alloy and preparation method thereof

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preparation example Construction

[0049] Embodiments of the present invention also provide a method for preparing a die-casting magnesium alloy, which specifically includes the following steps:

[0050] S1: Weigh industrially pure Mg, pure Al, pure Zn ingots and Mg-Nd, Al-Mn master alloy ingots according to the corresponding weight percentage and the corresponding yield of each element;

[0051] S2: Melting, refining, cooling, deslagging and die-casting are carried out in sequence for each raw material.

[0052] Wherein, step S2 specifically includes:

[0053] S21: in CO 2 and SF 6 Under the protection of mixed gas, after the industrial pure Mg is melted, the temperature is raised to 720-750 °C, and the industrial pure Al, pure Zn ingot, Mg-Nd and Al-Mn master alloy are added to the melt every 2-10 minutes, and the Stir the melt several times to make the melt composition uniform.

[0054] It should be noted that it is preferable to heat up to 730°C after the industrial pure Mg is melted, and add industrial...

Embodiment 1

[0062] This embodiment provides a die-casting magnesium alloy, the weight percent of the alloy composition is: Al: 2.0%, Nd: 1.0%, Zn: 0.2%, Mn: 0.05%, and the balance is Mg, which is prepared by the following method :

[0063] S1: Weigh industrially pure Mg, pure Al, pure Zn ingots and Mg-Nd, Al-Mn master alloy ingots according to the corresponding weight percentage and the corresponding yield of each element;

[0064] S2: Melting, refining, cooling, deslagging and die-casting are carried out in sequence for each raw material.

[0065] Wherein, step S2 specifically includes:

[0066] S21: in CO 2 and SF 6 Under the protection of mixed gas, after the industrial pure Mg is melted, the temperature is raised to 730 ° C, and the industrial pure Al, pure Zn ingot, Mg-Nd and Al-Mn master alloy are added to the melt every 5 minutes, and the melt is stirred within 1 hour Multiple times to make the melt composition uniform;

[0067] S22: After the melt composition is uniform, add ...

Embodiment 2

[0072] see figure 1 , figure 2 as well as image 3 , the present embodiment provides a die-casting magnesium alloy, the weight percent of the alloy composition is: Al: 3.1%, Nd: 3.1%, Zn: 0.6%, Mn: 0.1%, and the balance is Mg, which is prepared by the following method get:

[0073] S1: Weigh industrially pure Mg, pure Al, pure Zn ingots and Mg-Nd, Al-Mn master alloy ingots according to the corresponding weight percentage and the corresponding yield of each element;

[0074] S2: Melting, refining, cooling, deslagging and die-casting are carried out in sequence for each raw material.

[0075] Wherein, step S2 specifically includes:

[0076] S21: in CO 2 and SF 6 Under the protection of mixed gas, after the industrial pure Mg is melted, the temperature is raised to 730 ° C, and the industrial pure Al, pure Zn ingot, Mg-Nd and Al-Mn master alloy are added to the melt every 5 minutes, and the melt is stirred within 1 hour Multiple times to make the melt composition uniform;...

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Abstract

The invention discloses a die-casting magnesium alloy and a preparation method thereof, and relates to the field of metal materials. The die-casting magnesium alloy comprises 2.0%-3.5% of Al, 1.0%-3.5% of Nd, 0.2%-0.6% of Zn, 0.05%-0.2% of Mn and the balance Mg. According to the die-casting magnesium alloy, by adding Nd, the Al content is greatly reduced, the Zn content and the Mn content are slightly reduced, the die-casting room-temperature tensile strength of the alloy can be 250-260 MPa, the elongation can be 15.0%-17.0%, the heat conductivity coefficient can be 88.5-105.0 W / m.k, and the flowing length can be 1080-1165 mm. Compared with an AZ91D alloy under the same condition, the tensile strength is improved by 5%-9%, the elongation is improved by 150%-183%, the heat conductivity coefficient is improved by 45%-72%, the flowing length is basically equivalent, and the alloy has excellent comprehensive properties of medium strength, high plasticity, high heat conductivity and high flowability.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a die-casting magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of low density, high specific stiffness and specific strength, good vibration and noise reduction and electromagnetic shielding performance, easy processing, relatively stable component size, environmental protection, etc., and is widely used in automobiles, aerospace, communication electronics and other fields. In recent years, the vigorous development of 5G communications and the lightweight of key components of new energy vehicles (such as filter housings, battery pack housings / trays, etc.) have put forward higher requirements for the comprehensive performance and forming technology of magnesium alloy materials. Alloy materials should have good thermal conductivity while satisfying mechanical properties and casting process properties. [0003] At pres...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C23/06B22D17/08C22C1/03
CPCB22D17/08C22C1/03C22C23/02C22C23/06
Inventor 黄正华赵虎陈峰康跃华宋东福李卫荣朱伟
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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