217 ETCバー用マグネシウム合金の切断屑に用いた固相リサイクル素材の特性(再資源化・リサイクル・溶解技術(1))

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  • 217 Solid-state recycle of machined chips from wrought magnesium alloys used for ETC gate bar

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From a viewpoint of the weight reduction effect in saving energy consumption, Magnesium (Mg) alloy is one of useful Eco-materials because of its high specific strength due to a low density of about 1.7 g/cm^3. On the other hand, Mg alloy requires a little energy consumption in re-melting the scraps compared to aluminum alloys. Machined chips from magnesium products, however, are not suitable for the recycling process by re-melting because they are combustible. In this study, "Up-grade recycling system in solid-state" has been developed to produce wrought strengthened magnesium alloys with a high strength and ductility via Roll-Compaction (RCP) process. In-house wastes or scraps of AMX602 (Mg-6%AI-0.2%Mn-2%Ca) alloy chips in machining the gate bar used in Electronic Toll Collection (ETC) High-way System were employed as input materials in the present study. For example, when applying RCP technique, tensile strength and elongation of AMX602 is 372MPa and 14.8 %, respectively. They are extremely good compared to the original material with 289MPa T.S and 19.2% elongation.

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