MAGNESIUM ALLOYS CONTAINING RARE EARTHS

文件类型：PDF文档
文件大小：997K
Magnesium alloys containing rare earths which possess improved processability and/or ductility and/or corrosion characteristics and suitable for wrought and cast applications consisting of : Y : 2.0 - 6.0 % by weight Nd : 0 - 4.0 % by weight Gd : 0 - 5.5 % by weight Dy : 0 - 5.5 % by weight Er : 0 - 5.5 % by weight Zr : 0.05 - 1.0 % by weight Zn + Mn : < 0.11 % by weight, optionally other rare earths and heavy rare earths, the balance being magnesium and incidental impurities and the total content of Gd, Dy and Er is in the range of 0.3 - 12 % by weight, wherein either the alloy contains low amounts of Yb and Sm and exhibits a corrosion rate as measured according to ASTM B117 of less than 30 Mpy, and/or the area percentage of any precipitated particles arising when the alloy is processed having an average particle size greater than 1 μm and less than 15 μm is less than 3%. The alloys can be cast and / or heat treated and / or wrought and/or used as a base alloy for a metal matrix composite.