Magnesium alloy and method for making the same

Abstract

Magnesium-based alloys having good mechanical properties, such as mechanical strength, ductility, and castability, and methods of making the magnesium alloys are disclosed. The magnesium alloys comprise 8.7 to 11.8 wt % aluminum, 0.63 to 1.93 wt % zinc, 0.1 to 0.5 wt % manganese, 0.5 to 1.5 wt % rare earth elements, and a remainder of said magnesium alloy being composed of magnesium and unavoidable impurities.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application is a divisional application of U.S. patent application Ser. No. 12 / 533,011, filed on Jul. 31, 2009, the entire content of which is incorporate by reference.BACKGROUND[0002]1. Technical Field[0003]The present disclosure relates to magnesium-based alloys having good mechanical properties, such as mechanical strength, ductility and castability.[0004]2. Description of the Related Art[0005]Magnesium-based alloys have been widely used as cast parts in the aerospace and automotive industries and are mainly based on the following four systems: Mg—Al system (i.e., AM20, AM50, AM60); Mg—Al—Zn system (i.e., AZ91D); Mg—Al—Si system (i.e., AS21, AS41); and Mg—Al—Rare Earth system (i.e., AE41, AE42).[0006]Magnesium-based alloy cast parts can be produced by conventional casting methods which comprise die-casting, sand casting, permanent and semi-permanent mold casting, plaster-mold casting and investment casting. These materials d...

AI Technical Summary

Benefits of technology

The present patent application is a divisional application of U.S. patent application Ser. No. 12 / 533,0011, filed on July 31, 2009. The patent relates to magnesium-based alloys that have good mechanical properties, particularly ductility and castability. The technical effects of the patent include improving the mechanical strength and ductility of magnesium-based alloys through the addition of rare earth elements and controlling the content of aluminum, zinc, manganese, rare earth elements, and magnesium. The patent also discusses the microstructure of magnesium alloys and the effect of different elements on castability, corrosion resistance, and crack sensitivity. Overall, the patent aims to provide magnesium-based alloys with improved mechanical properties and castability for various applications.

Problems solved by technology

However, AS and AE alloys, while developed for higher temperature applications, offer only a small improvement in creep resistance and / or are expensive.

On the other hand, AM and AZ alloys are limited to low strength and have poor ductilities for casting.

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