HIGH STRENGTH MAGNESIUM ALLOY ESSENTIALLY CONSISTING OF MAGNESIUM AND ADMIXED WITH TRACE AMOUNT OF COPPER OR COPPER AND YTTRIUM

摘要

PROBLEM TO BE SOLVED: To provide a high strength magnesium alloy producible by a relatively simple process at a lower cost.;SOLUTION: An alloy obtained by adding a trace amount of copper or copper and yttrium to magnesium and performing melting under heating in a crucible made of carbon in an inert atmosphere such as argon is rapidly cooled by a method where it is sprayed on a rotating drum made of copper at a high speed. From the rapidly solidified alloy, a magnesium alloy containing a trace amount of copper or copper and yttrium can be obtained. In the case of the independent addition of copper, the obtained alloy has fine crystal grains and uniform precipitates. Further, in the case of the composite addition of copper and yttrium, a long period hexagonal dense structure is formed around a fine amorphous phase dispersed into the crystal grains. The alloy obtained in this way is a material having high mechanical strength.;COPYRIGHT: (C)2007,JPO&INPIT