Microstructural Refinement of Hyper-Eutectic Al–Si–Fe–Mn Cast Alloys to Produce a Recyclable Wrought Material
Osamu UmezawaMunefumi NakamotoYoshiaki OsawaKenta SuzukiShinji Kumai
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Volume 46 (2005) Issue 12 Pages 2609-2615

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Although the cascade of material flow is presently suitable for the aluminum recycling, a better utilization of secondary alloys is required. In order to establish an upgradeable recycling design for developing wrought products from secondary aluminum alloys, a fine distribution of the primary phases in hyper-eutectic Al–Si–Fe–Mn cast materials has been achieved. Two novel processes were adopted. One was repeated thermomechanical treatment (RTMT), which involves a repetition of a multi-step cold-working followed by heat treatment. The other was rapid solidification by high-speed twin-roll casting to develop a fine solidification structure in a thin sheet. By applying these processes, refined microstructures were successfully obtained. Microstructural refinement by RTMT resulted in the avoidance of early fracture that was detected in the cast material by a tensile test. The RTMT imparted good ductility; therefore, it was possible to allow greater flexibility in the cold working of Al–Si–Fe–Mn cast materials.

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© 2005 The Japan Institute of Metals and Materials
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