Corrosion and Mechanical Properties of AZ91D Magnesium Alloy Fabricated by Solid Recycling Process

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  • Chino Yasumasa
    Materials Processing Department, National Industrial Research Institute of Nagoya, AIST
  • Kishihara Ryuji
    Department of Materials Science and Engineering, College of Engineering, Himeji Institute of Technology
  • Shimojima Koji
    Materials Processing Department, National Industrial Research Institute of Nagoya, AIST
  • Yamada Yasuo
    Materials Processing Department, National Industrial Research Institute of Nagoya, AIST
  • Wen Cui’e
    Materials Processing Department, National Industrial Research Institute of Nagoya, AIST
  • Iwasaki Hajime
    Department of Materials Science and Engineering, College of Engineering, Himeji Institute of Technology
  • Mabuchi Mamoru
    Materials Processing Department, National Industrial Research Institute of Nagoya, AIST

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Other Title
  • 固体リサイクル法によって再生されたAZ91Dマグネシウム合金の腐食特性および機械的特性
  • コタイ リサイクルホウ ニ ヨッテ サイセイ サレタ AZ91D マグネシウム ゴウキン ノ フショク トクセイ オヨビ キカイテキ トクセイ

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Abstract

We have proposed the “Solid Recycling Process” as a new recycling process for magnesium scraps. In the new process, the recycled materials can be fabricated without melting of scraps, by extruding the scraps. We have investigated corrosion and mechanical properties of the AZ91D magnesium alloy fabricated by this process and clarified the validity of this process. Chemical compositions of the recycled material were in agreement with those of the Japanese Industrial Standard of AZ91D and the contamination levels of Fe, Ni, Cu and Si were low, though Si particles were observed by TEM observation. Mass loss of the recycled material after 72 hour in 3 mass%NaCl solution was about 1.5×10−2 kg/m2 which was comparable with that of a virgin ingot. The recycled material showed high strength and larger elongation than a virgin ingot. The feature of the solid recycling process is improvement of mechanical properties by recycling. The improvement of mechanical properties is attributed to grain refinement by hot extrusion.

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