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Magnesium alloy suitable for compression casting ultrathin wall member and preparation method

A magnesium alloy, ultra-thin-wall technology, applied in the field of magnesium alloys, to achieve the effect of excellent castability

Inactive Publication Date: 2010-06-16
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnesium alloy provided by the present invention is based on the systematic study of the influence of alloy elements on the casting fluidity and mechanical properties of Mg-Al alloys, and solves the brittleness of high-aluminum magnesium alloys by adding rare earth elements Nd and Pr to magnesium alloys with high aluminum content. problem, and further improved the casting fluidity of Mg-Al alloy

Method used

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  • Magnesium alloy suitable for compression casting ultrathin wall member and preparation method
  • Magnesium alloy suitable for compression casting ultrathin wall member and preparation method
  • Magnesium alloy suitable for compression casting ultrathin wall member and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The proportioning composition (mass percentage) of the alloy is: Al: 13.0%; Nd: 1.0%; Pr: 0.3%; Zn: 0.7%; ≤0.004%, Ni≤0.002%, Fe≤0.004%, and the balance is Mg.

[0037] in CO 2 +SF6 mixed gas (CO 2 : SF 6 =150:1) Under the protection, the magnesium alloy of the above components is smelted in a 10KG magnesium smelting furnace, and the alloy is smelted according to the chemical composition of the alloy. Metal Al (secondary, ≮99%), industrial pure metal, industrial pure metal Zn and a ratio of about: Nd:Pr=5.3:2 industrial grade mixed rare earth alloy or industrial pure Nd and industrial pure Pr, Al in separate form - Mn alloy (Mn about 10%). The melting temperature is about 740°C, and the pouring temperature is about 720°C. The mobile phone shell with a wall thickness of 1mm is die-casted by a magnesium die-casting machine, and the yield rate is 96%. It has also successfully used the crumb-like raw material of the composition alloy to manufacture magnesium alloy not...

Embodiment 2

[0041] The alloy composition (mass percentage) is: Al: 11.3%, Nd: 0.6%, Pr: 0.22%, Zn: 0.5%, Mn: 0.3%, and the unavoidable impurity elements are limited to: Si≤0.05%, Cu≤ 0.004%, Ni≤0.002%, Fe≤0.004%, and the balance is Mg.

[0042] in CO 2 +SF 6 mixed gas (CO 2 :SF 6 =200:1) under the protection, the magnesium alloy of above-mentioned composition is smelted in 10kg magnesium smelting furnace, and alloy is smelted according to alloy chemical composition ratio, and smelting raw material is: industrial pure metal magnesium (grade two,≮99.9%), metal aluminum (Class II, ≮99%), Industrial Pure Zinc (≮99.95%), Industrial Pure Nd-Pr Mixed Rare Earth Alloy (Nd:Pr=5.3:2, RE Total ≮99%, Nd+Pr Total ≮99.9% ), Al-Mn master alloy (Mn is about 10%). The melting temperature is about 740°C, and the pouring temperature is about 720°C. A mobile phone case with a wall thickness of 1 mm is cast by a magnesium die-casting machine, and the yield rate is 95%. It has also successfully used the...

Embodiment 3

[0044] The alloy composition (mass percentage) is: Al: 13.5%, Nd: 1.8%, Pr: 0.95%, Zn: 0.4%, Mn: 0.3%, and the unavoidable impurity elements are limited to: Si≤0.05%, Cu≤ 0.004%, Ni≤0.002%, Fe≤0.004%, and the balance is Mg.

[0045] in CO 2 +SF 6 mixed gas (CO 2 :SF 6 =180:1) under the protection, the magnesium alloy of above-mentioned composition is smelted in 10kg magnesium smelting furnace, alloy is smelted according to alloy chemical composition ratio, smelting raw material is: industrial pure metal magnesium (secondary, ≮99.9%), metal aluminum (Grade 2, ≮99%), industrial pure metal zinc (≮99.95%), industrial pure Nd-Pr master alloy (Nd:Pr=5.3:2, RE total ≮99.9%, Nd+Pr total ≮99% ), Al-Mn master alloy (Mn is about 10%). The melting temperature is about 740°C, and the pouring temperature is about 720°C. A mobile phone casing with a wall thickness of 1 mm is cast by a magnesium die-casting machine, and the yield rate is 97%. It has also successfully used the shavings ...

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Abstract

The invention relates to a magnesium alloy suitable for die casting of ultra-thin-wall castings and a preparation method thereof, and belongs to the field of magnesium aluminum alloy. The compositionsin weight percent of the alloy are 11.0 to 14.0 percent of aluminum, 0.5 to 2.0 percent of neodymium, 0.1 to 1.0 percent of praseodymium, 0.2 to 1.0 percent of zinc, 0.2 to 0.4 percent of manganese,and the balance being magnesium element and inevitable impurity elements. The preparation method for the magnesium alloy is to adopt protective atmosphere of CO2 and SF6 for smelting, wherein the smelting temperature is between 710 and 750 DEG C. The alloy prepared consists of alpha phase, Mg17Al12 phase containing the neodymium or the praseodymium, and magnesium, aluminum, neodymium and praseodymium complex intermetallic compound phase. The mechanical property of the magnesium alloy is superior to that of an AZ91D magnesium alloy, and the casting fluidity of the magnesium alloy is obviously superior to that of the AZ91D and improved by 25.6 percent compared with the AZ91D, so that the magnesium alloy is suitable for die casting or semi-solid casting and can also be used for sand mold or iron mold gravity casting or low-pressure casting.

Description

technical field [0001] The invention relates to a magnesium alloy suitable for die-casting ultra-thin wall parts and a preparation method thereof, more precisely to a high aluminum content Mg-Al-Nd-Pr cast magnesium alloy with an aluminum content of 11.0-14.0 mass percent and its preparation The method belongs to the field of magnesium alloys. Background technique [0002] Magnesium alloy has low density, high specific strength, high specific stiffness, excellent electromagnetic shielding performance and shock absorption performance, good casting and processing performance, and is widely used in 3C products (computers, communication products and consumer electronics products) such as aerospace, automobile and electronic information. ) field has been more and more widely used, and its usage has grown at an annual rate of 20% in recent years. [0003] However, the poor fluidity of magnesium alloys is an important obstacle to its application. Due to its poor fluidity, magnesi...

Claims

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Application Information

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IPC IPC(8): C22C23/02B22D21/04
Inventor 周学华黄元伟陈秋荣卫中领高存旺
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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