切粉より作製したAZ91マグネシウム合金の機械的性質

概要

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Mechanical properties of both materials processed by sintering or extrusion from machined chips were investigated, compared to an as-cast or an extruded one, for an AZ91 magnesium alloy. The sintering conditions were a temperature of 643K and a pressure of 100 MPa in air, and the extrusion conditions were a temperature of 643K and a ratio of 100:1 in air. As a result of tension tests at room temperature, the material processed by sintering showed a low ultimate tensile strength of about 80MPa and a low elongation to failure of less than 1%. On the other hand, the material processed by extrusion showed a high ultimate tensile strength of about 340 MPa and a high elongation to failure of 10%, which were almost the same as those of the extruded one. Also, superplastic-like behavior was found at 573K with 2 x 10<SUP>-4</SUP> s<SUP>-1</SUP> for the material processed by extrusion. These results suggest that magnesium alloys which show excellent mechanical properties at room temperature and high ductility at elevated temperatures can be processed by extruding machined chips.
社団法人粉体粉末冶金協会の論文