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Magnesium based alloy

A magnesium-based alloy and alloy technology, applied in the field of magnesium-based alloys, can solve problems such as difficult die-casting

Inactive Publication Date: 2012-01-11
铸造CRC有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Alloys according to WO2006 / 105594 have proven to have excellent high temperature creep properties but have proven difficult to die cast

Method used

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  • Magnesium based alloy
  • Magnesium based alloy
  • Magnesium based alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A high Nd variant die casting alloy having the following composition:

[0057] 1.8wt.%Nd

[0058] 0.7wt.% Ce

[0059] 0.4wt.%La

[0060] 0.6wt.%Zn

[0061] Balance Mg

[0062] The alloy is removed from a special cover gas shield called AM-cover by immersing a cylinder with 10mm diameter holes in the bottom. Dry air was introduced at the top of the cylinder at a rate of 2 l / min. The bottom of the cylinder is immersed in the molten alloy at a depth of 50 mm, and the surface of the molten material is observed.

[0063] For this high-Nd alloy, the surface of the fresh melt turns black almost instantly, and after a short period of time, there is an abundance of burnt magnesium.

[0064] The addition of 53 ppm of yttrium to the melt via a 43% yttrium-57% magnesium master alloy greatly changes the oxidation resistance of the melt. When the cylinder is inserted into the melt, the surface of the melt will remain bright and glossy for 5 seconds before spot burning occurs. ...

Embodiment 2

[0074] Ten alloys were prepared and the chemical analysis of the alloys is shown in Table 1 below. Rare earth elements are added in the form of cerium-based mischmetals (containing cerium, lanthanum and some neodymium) and the elements lanthanum and neodymium. Yttrium and zinc are added in their elemental form. Beryllium is added as an aluminum-beryllium master alloy. Aluminum can be added in the form of this master alloy and elemental aluminum, or in the form of no beryllium but only elemental aluminum. Zirconium is added via a specialized Mg-Zr master alloy called AM-cast. Except for incidental impurities, the alloy balance is magnesium. Standard melt processing procedures were used during alloy preparation.

[0075] alloy

wt.%

Nd

wt.%

Ce

wt.%

La

wt.%Y

wt.%

Zn

ppm

be

wt.%

Al

ppmFe

wt.%

Zr(total)

A

1.47

0.49

1.71

＜0.005

0.59

＜1

...

Embodiment 3

[0098] Alloys I, J and H (see Table 1, Example 2) were cast by high pressure die casting using the castability test die mentioned in Example 2 above to study the effect of lanthanum and cerium on the castability of the alloy.

[0099] Figure 4 The internal defect structures on the same part of the casting of (a) Alloy I, (b) Alloy J and (c) Alloy H are shown. Alloy I (0.66 wt% cerium, 0.37 wt% lanthanum) is believed to have the greatest amount of internal cracking after casting. By changing the ratio of lanthanum to cerium in Alloy J (0.68 wt% lanthanum, 0.28 wt% cerium) to greater than 1:1, the Figure 4 It is seen in (b) that the amount of internal cracking is reduced, improving the overall quality of the casting. Another castability improvement occurred with alloy H, which had higher amounts of lanthanum and cerium (1.7 wt% lanthanum, 1.1 wt% cerium) and a greater than 1:1 ratio of lanthanum to cerium and reduced neodymium content (compared to 1.62 wt% neodymium in Allo...

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Abstract

A magnesium based alloy consisting of, by weight: 2-5% rare earth elements, wherein the alloy contains lanthanum and cerium as rare earth elements and the lanthanum content is greater than the cerium content; 0.2-0.8% zinc; 0-0.15% aluminium; 0-0.5% yttrium or gadolinium; 0-0.2% zirconium; ' 0-0.3% manganese; 0-0.1% calcium; 0-25 ppm beryllium; and the remainder being magnesium except for incidental impurities.

Description

technical field [0001] The invention relates to a magnesium-based alloy, in particular to a magnesium-based alloy which can be cast by high pressure die casting (HPDC). Background technique [0002] As the need to limit fuel consumption and reduce harmful emissions to the environment grows, automakers are looking to develop more fuel-efficient vehicles. Reducing the overall weight of the vehicle is key to achieving this goal. The majority of the weight of any vehicle comes from the engine and other components of the drivetrain. The most important component of the engine is the cylinder block which accounts for 20-25% of the total weight of the engine. Most of the weight savings have been achieved in the past by introducing an aluminum alloy cylinder block instead of the traditional gray iron block, and a further weight reduction of approximately 40% can be achieved by using a magnesium alloy that can withstand the temperatures and pressures generated during engine operatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06
CPCB22D17/00C22C23/06
Inventor 马克·吉布森马克·伊斯顿科琳·贝特尔斯
Owner 铸造CRC有限公司
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