MAGNESIUM BASED ALLOY EXTENSION MATERIAL AND METHOD FOR PRODUCING THE SAME

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PROBLEM TO BE SOLVED : To solve the problem that, though the addition of a rare earth element(s) and the refining of crystal grain sizes are frequently used for improving the extensibility and moldability of a magnesium alloy, the conventional additional elements check the activity of boundary sliding complementing plastic deformation, thus, the search of an additional element having an action of promoting boundary sliding is required using an inexpensive, versatile element while maintaining a fine organization structure activating non-bottom face dislocation. SOLUTION : Provided is an Mg based Mg alloy extension material excellent in room temperature ductility, containing Sn of 0.14 to 14.48 mass%, and the balance Mg with inevitable impurities, in which the average crystal grain size of a base material is 20 μ or lower, also, in a stress stain curve by the tensile test of the extension material, the value between the maximum load stress (σmax) and stress upon fracture (σbk), (σmax-σbk)/σmax is 0.3 or more, a strain velocity sensitivity intex shows 0.1 or more, and the crystal grain size of the Mg mother phase is refined during room temperature deformation. SELECTED DRAWING : Figure 3 COPYRIGHT : (C)2018, JPO&INPIT