Mg-Al-Zn-Ca系ポーラスマグネシウム合金の室温圧縮特性(<小特集>M&P2009機械材料・材料加工部門技術講演会)

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We investigated the fabrication process and the mechanical properties of the AZX912 alloy machined chips sintered with gas forming material powder, Celltetra, and then, extruded. The fabricated material became porous by foaming of Celltetra. Relative density, ρ/ρ_0, of 0.34 was obtained with the volume expansion ratio, V/V_0=4 at 963K. It was proven that Celltetra powder agglomerates and the foaming occurs at the triple junction of the magnesium alloy matrix. In compression tests at room temperature, we obtained stable plateau stress in the extrusion direction of the material at the strain rate of ε=10^0s^<-1>. Generally, it is difficult to check internal pores visually. Therefore, by using the X-ray CT equipment, detailed pore information was acquired as CT image in this study. We also observed xy-, yz-, zx- surface with optical microscope to obtain the characteristics of the material. Then, pore feature and the material characteristics were correlated analyzing the CT image with the image processing technique. It was proven that uniformity and pore shape of the inside sectional structure influenced the plateau region and plateau stress.
2010-06-25