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Influence of low temperature working on microstructure and mechanical properties of AI-7Si-(Fe) alloys

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Abstract

Changes in the microstructure and mechanical properties of Al-7Si-(Fe) alloys by low temperature working have been investigated. The size and shape of eutectic Si and intermetallic AlSiFe compound were controlled by the low temperature working process. This process consisted of repeated cold working at 77 K and recovery treatment at 793 K. By applying this process to the Al-7Si-1Fe alloy, the eutectic Si and acicular Fe compound(β-AlSiFe) phases were broken down to the size of 2-3 μm, with spherical shape. The refined particles were uniformly distributed, and a fine microstructure was obtained. The strength and elongation of Al-7Si-1Fe alloy increased as the temperature was lowered due to the microstructural refinement. This elongation was well reflected in the fracture surface.

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Authors and Affiliations

  1. Department of Materials Engineering, Korea Institute of Machinery and Materials, 66 Sangnam-dong, 641-010, Changwon, Korea

    Cha-Yong Lim, Osa mu Umezawa & Kotobu Nagai

  2. National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, 305, Ibaraki, Japan

    Osa mu Umezawa & Kotobu Nagai

Authors
  1. Cha-Yong Lim
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  2. Osa mu Umezawa
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  3. Kotobu Nagai
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Lim, CY., Umezawa, O.m. & Nagai, K. Influence of low temperature working on microstructure and mechanical properties of AI-7Si-(Fe) alloys. Metals and Materials 4, 1027–1031 (1998). https://doi.org/10.1007/BF03025972

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  • DOI: https://doi.org/10.1007/BF03025972

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