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Rare earth-containing heat-resisting magnesium alloy

A magnesium alloy and rare earth technology, which is applied in the field of Mg-Al-RE heat-resistant die-casting magnesium alloys and rare earth-containing heat-resistant magnesium alloys, can solve the problems of increased application cost, use temperature not exceeding 120°C, poor alloy plasticity, etc. Achieve the effect of improving competitiveness, inhibiting dislocation climbing, and improving high temperature performance

Inactive Publication Date: 2012-11-14
LINJIANG DONGFENG NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with aluminum alloys, magnesium alloys have poorer high temperature performance
The widely used AZ. AM series of die-casting magnesium alloys can not be used for a long time at a temperature exceeding 120°C, and cannot be used in automotive power system components that require high-temperature creep performance, thus greatly hindering the further application of magnesium alloys
The heat-resistant magnesium alloys Mg-Al-Ca (AX) and Mg-Al-Sr (AJ) alloys currently developed with the addition of alkaline earth elements have the disadvantages of high hot cracking sensitivity and poor alloy plasticity.
Adding rare earth elements can significantly improve the heat resistance of magnesium alloys. A lot of development and research work has been carried out at home and abroad. However, the heat-resistant magnesium alloys containing rare earths currently developed mainly use pure rare earths or magnesium rare earth binary master alloys to achieve rare earth. Alloying, as the price of rare earths in the international market continues to rise, the cost of magnesium alloys added with rare earths continues to rise, making its application costs continue to increase, which limits its wide application

Method used

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Experimental program
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Effect test

Embodiment 1

[0016] like figure 1 as shown, It can be seen from the microstructure that after the addition of rare earth, the Mg17All2 phase with poor thermal stability at the grain boundary is significantly suppressed, and the rare earth combines with aluminum in the magnesium alloy to form Al 11 (Ce, La) 3 and A1 2 Nd Mainly distributed in the grain boundaries and inside the grains.

[0017] Adopt cerium lanthanum rare earth and pure neodymium to prepare heat-resistant magnesium alloy containing rare earth, weight 50Kg, alloy chemical composition is as shown in Table 1:

[0018] Table 1 The chemical composition of rare earth-containing heat-resistant magnesium alloy prepared by using cerium-lanthanum rare earth and pure neodymium (Wt%)

[0019] Al RE RE ratio mn Mg 4.0 3.8 Ce:La:Nd=35:60:5 0.28 margin

[0020] The preparation process is as follows:

[0021] (1) Raw material preparation: magnesium ingot, weight 44.90kg; Al ingot, weight 1.07kg; cer...

Embodiment 2

[0026] The rare earth-containing heat-resistant magnesium alloy is prepared by using the magnesium-cerium-lanthanum-neodymium master alloy, the weight is 100Kg, and the chemical composition of the alloy is shown in Table 1:

[0027] Table 2 Chemical composition of rare earth-containing heat-resistant magnesium alloys prepared by magnesium-cerium-lanthanum-neodymium master alloy (Wt%)

[0028] Al RE RE ratio mn Mg 4.0 4.2 Ce:La:Nd=40:55:5 0.20 margin

[0029] The preparation process is as follows:

[0030] (1) Raw material preparation: magnesium ingot, weight 74.80kg; aluminum ingot, weight 2.66kg; magnesium-20% (cerium, lanthanum, neodymium) rare earth master alloy (rare earth weight ratio, Ce:La:Nd=40:55:5): , weight 21.00kg; Al-13%Mn master alloy, weight 1.54kg;

[0031] (2) Pretreatment: Preheat magnesium ingots, aluminum ingots, aluminum-manganese master alloys and magnesium-20% (cerium, lanthanum and neodymium) rare earth master al...

Embodiment 3

[0035] Adopt magnesium-cerium lanthanum neodymium master alloy and neodymium rare earth to prepare heat-resistant magnesium alloy containing rare earth, weight 100Kg, alloy chemical composition is as shown in Table 1:

[0036] Table 3 Chemical composition of rare earth-containing heat-resistant magnesium alloys prepared by using magnesium-cerium-lanthanum-neodymium master alloy and neodymium rare earth (Wt%)

[0037] Al RE RE ratio mn Mg 4.1 3.9 Ce:La:Nd=38:57:5 0.25 margin

[0038] The preparation process is as follows:

[0039] (1) Raw material preparation: magnesium ingot, weight 77.46kg; aluminum ingot, weight 1.89kg; magnesium-20% (cerium lanthanum) rare earth master alloy (rare earth weight ratio, Ce:La =38:57), weight 18.53kg; neodymium Rare earth, weight 0.20 kg; Al-13%Mn master alloy, weight 1.92 kg;

[0040] (2) Pretreatment: Preheat magnesium ingots, aluminum ingots, aluminum-manganese master alloys, magnesium-20% (cerium-lanthanum...

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Abstract

The invention relates to a rare earth-containing heat-resisting magnesium alloy which is characterized by comprising the chemical components in the terms of weight percent: 3.5-4.4 percent of Al, 5.5-6.4 percent of RE and 0.17-0.25 percent of Mn, wherein RE is cerium, lanthanum and neodymium with the weight proportion of (35-40):(60-55):5. Room temperature and high temperature mechanical properties of the rare earth-containing heat-resisting magnesium alloy are superior to those of an AE44 alloy; and the rare earth-containing heat-resisting magnesium alloy can work for a long time under the condition of 180 DEG C / 80MPa, has the minimum creep rate of not more than 1.7*10<-9> / s under the condition of 180 DEG C / 80MPa and the maximum creep elongation of not more than 0.17 percent within 100h, and can be used for manufacturing parts such as an automatic gearbox housing and the like with higher high-temperature creep property requirements for materials.

Description

technical field [0001] The invention relates to a rare earth-containing heat-resistant magnesium alloy, in particular to a Mg-Al-RE heat-resistant die-casting magnesium alloy containing cerium, lanthanum and neodymium, which belongs to the technical field of magnesium alloy materials. Background technique [0002] In recent years, with the requirements of automobile lightweight, environmental protection and energy saving, Mg-Al based lightweight die-casting magnesium alloys have been popularized and applied in automobiles. However, magnesium alloys have poorer high temperature performance compared to aluminum alloys. At present, the widely used AZ. AM series die-casting magnesium alloys can not exceed 120°C for long-term use, and cannot be used in automotive power system components that require high high-temperature creep performance, thus greatly hindering the further application of magnesium alloys. The currently developed heat-resistant magnesium alloys Mg-Al-Ca (AX) and...

Claims

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Application Information

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IPC IPC(8): C22C23/06
Inventor 赵海东刘海峰孟健崔晓鹏郭郁
Owner LINJIANG DONGFENG NON FERROUS METALS
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