Importance of magensium and its alloys has been recognized as a light-weight high specific strength material, which can cope with the recent energy and environmental problems. However, it is very dangerous to produce magnesium alloys in the air due to the ignition during melting and casting. This is a critical obstacle which disturbs magnesium alloys in their industrial applications. We reported (1)(2) that the combined addition of calcium and zirconium was effective for the ignition prevention of magnesium alloys during melting and casting. In addition, the semi-solid state forming processes that has recently received a considerable attention as a technique giving serveral potential benefits(3) are suitable to safe production of magnesium alloys. The subsequent target which we should hit is to apply such the "ingition-proof magnesium alloys" to the semi-solid state forming processes for the improvement of mechanical properties.
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