固化成形したMg切削粉の機械的特性

抄録

Magnesium chips less than 1 mm sizes, which are produced by the cutting of AZ91Ca2 alloy billet, are pressed at 423K and 573K to make a preform. The preforms are extruded at 623K on the extrusion ratio of 5 and 20. Microstructure of a test piece is observed by an optical microscope. Mechanical properties, fracture strength and strain, are also examined by compression test between room temperature and 523K. Microstructure shows dense microstructure with the increasing of pressing temperature and extrusion ratio. On the extrusion ratio of 5, the fracture strength and strain at the pressing temperature of 423K and 573K are 400MPa and 0.15 and 416MPa and 0.14 at the room temperature. The fracture strength and strain at the extrusion ratio of 20 are 370MPa and 0.39 at the room temperature. Influence of the pressing temperature on the fracture strength and strain is smaller than the influence of the extrusion ratio. Also the fracture strength is decreasing and the fracture strain is increasing with the increasing of the test temperature. Above the test temperature of 523K, remarkable fracture is not shown on the test pieces. From these results, recycled magnesium alloy show possibility to be use as for plastic forming materials.