AE series thermo-stable die-casting magnesium alloy containing cerium and lanthanide

Abstract

The invention relates to an AE series heat resistant casting magnesium alloy containing cerium and lanthanum, which comprises and has the weight percentage of each element of: Al:3%-5%, Ce:0.4%-2.6%, La:0.4%-2.6%, Mn:0.2%-0.6%, the rest being magnesium. The lanthanum cerium mischmetal used is produced by separating the Nd, Pr which is more valuable and selling from ordinary cerium rich mischmetal which leaves the cheap and abundant cerium lanthanum mischmetal. The invention has better mechanical performance in both normal and high temperature than AE44 and AZ91alloy, and the minimum creep rate under 200 DEG C, 70MPa is 1.82 multiplied by10-9s-1, 100 hour creeping elongation rate is 0.17%, all being better than an AE44 alloy.

Description

technical field [0001] The invention relates to an AE series heat-resistant die-casting magnesium alloy containing cerium and lanthanum, belonging to the field of magnesium alloy materials. Background technique [0002] In recent years, due to the increasing pressure of environmental protection and awareness of energy conservation, lightweight die-casting magnesium alloys mainly based on Mg-Al alloys have been popularized and applied in automobiles. However, compared with aluminum alloys, there is still a big gap in the application of magnesium alloys. One of the reasons is the lack of sufficient high temperature performance. The long-term service temperature of AZ and AM series die-casting magnesium alloys widely used at present cannot exceed 120°C, making them unable to be used in the manufacture of automotive transmission parts that require high temperature creep performance, thus greatly hindering the further application of magnesium alloys. Based on this, rare earth an...

AI Technical Summary

Problems solved by technology

However, compared with aluminum alloys, there is still a big gap in the application of magnesium alloys. One of the reasons is the lack of sufficient high temperature properties.

At present, the widely used AZ and AM series of die-casting magnesium alloys can not be used for a long time at a temperature exceeding 120°C, making them unable to be used in the manufacture of automotive transmission parts that require high temperature creep performance, thus greatly hindering the further application of magnesium alloys

Based on this, rare earth and alkaline earth elements are introduced into Mg-Al based alloys to develop magnesium alloys with high temperature creep resistance. However, there are still some problems in the heat-resistant magnesium alloys currently developed.

Mg-Al-Ca(AX) and Mg-Al-Sr(AJ) alloys mainly have disadvantages such as easy hot cracking and poor alloy plasticity; the rare earth used in the developed Mg-Al-RE(AE) alloy is rich in Cerium mixed rare earth (including La, Ce, Pr, Nd), however, the price of Pr and Nd has been rising, which makes the cost of such AE alloys increase. In addition, the mechanical properties of the currently developed heat-resistant magnesium alloys also need to be improved

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