Ae series heat resistant compression casting magnesium alloy containing cerium and lanthanum

Abstract

This invention relates to an AE series heat resistant compression casting magnesium alloy containing cerium and lanthanum and the composition ingredients and the weight percentage thereof are as follows: Al: 3%˜5%, Ce: 0.4%˜2.6%, La: 0.4%˜2.6%, Mn: 0.2%˜0.6%, and the remainder is magnesium. The raw material of cerium lanthanum mixture of rare earth used is the residual, cheap and overstocked cerium lanthanum mixture of rare earth obtained from common cerium rich mixture of rare earth after the Nd, Rr with high value and good market have been separated. The mechanical performance of this invention at room temperature and high temperature excels that of AE 44 and AZ 91 alloys, and the minimum creep rate of 1.82×10-9 S-1 and the creep percentage elongation in 100 h of 0.17% at the condition of 200° C. and 70 MPa excel these of AE 44 alloy.

Description

TECHNICAL FIELD[0001]The present invention relates to a magnesium alloy material, and more particularly, to an AE series heat resistant compression casting magnesium alloy containing cerium and lanthanum.BACKGROUND ART[0002]In recent years, due to the pressure of environment protection and the enhancement of energy saving consciousness, the light compression casting magnesium alloys mainly in Mg—Al based alloys have found extended application in automobiles. However, as compared with aluminum alloys, the application of magnesium alloys still drops behind greatly and one of the reasons thereof is being short of sufficient high temperature property. At present, the long-term service temperatures of the AZ, AM series compression casting magnesium alloys used widely can not excess 120° C., which makes them can not be used in manufacturing automobile driving assemblies that requires high creep resistant performance at high temperature, therefore the further application of magnesium alloy...

AI Technical Summary

Benefits of technology

[0005]For overcoming the shortcomings of the present compression casting magnesium alloys, this invention provides an AE series heat resistant compression casting magnesium alloy containing cerium and lanthanum. This alloy has a low cost, a good heat resistant performance and a long-term service temperature up to 200° C.

Problems solved by technology

However, as compared with aluminum alloys, the application of magnesium alloys still drops behind greatly and one of the reasons thereof is being short of sufficient high temperature property.

At present, the long-term service temperatures of the AZ, AM series compression casting magnesium alloys used widely can not excess 120° C., which makes them can not be used in manufacturing automobile driving assemblies that requires high creep resistant performance at high temperature, therefore the further application of magnesium alloys is blocked greatly.

On the basis of that, the rare earth and alkali earth elements have been introduced into Mg-Al based alloys to develop a magnesium alloy with a creep resistant performance at high temperature, however, there are still some problems existing in this kind of heat resistant magnesium alloys developed recently.

The main disadvantages existing in Mg—Al—Ca (AX) and Mg—Al—Sr (AJ) alloys are that thermal cracking occurs easily and the inferior plastic property of the alloys, and the like.

The rare earths used in Mg—Al—Re alloys (herein, referred to as “AE series alloys”) developed are cerium rich mixture of rare earths (including La, Ce, Pr and Nd), however, the prices of Pr, Nd keep rising at present which makes the costs of this kind of AE series alloys increased.

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