Free-machinable eutectic Al-Si alloy
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United States of America Patent
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Jan 28, 2003
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app pub date -
May 31, 2002
filing date -
Mar 27, 2002
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Abstract
A free-machinable eutectic Al--Si alloy including 3.0-5.0 wt % Cu, 10.0-13.0 wt % Si, 0.2-0.5 wt % Fe, 2.5-5.0 wt % Bi, 0.1-0.3 wt % Sb, up to 0.1 wt % Mg, up to 0.1 wt % Ni and up to 0.5 wt % total sum of other elements, with the balance of the alloy being Al. The eutectic Al--Si alloy is advantageous in light of excellent machinability, easy cutting operation, extended lifetime of cutting tools and improved smoothness of cutting faces. In addition, the alloy has an excellent elongation ratio and abrasion resistance and good formability, while maintaining mechanical properties such as impact strength, tensile strength, yield strength and hardness which can be applied to compressor piston for air conditioner in motorcars, and thus can be applied to abrasion resistance-requiring applications, for example, piston of compressors for automotive air conditioners, without any surface treatment including anodizing or Sn plating.
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