MOTORBESTANDTEIL UND HERSTELLUNGSVERFAHREN DAFÜR

摘要

An engine component composed of an aluminum alloy containing silicon having a plurality of primary-crystal silicon grains located on a slide surface. The plurality of primary-crystal silicon grains have an average crystal grain size of no less than about 12 µm and no more than about 50 µm. A plurality of eutectic silicon grains disposed between the plurality of primary-crystal silicon grains. The plurality of eutectic silicon grains have an average crystal grain size of no more than about 7.5 µm. In any arbitrary rectangular region of the slide surface having an approximate area of 800 µm X 1000 µm, the number of circular regions having a diameter of about 50 µm and not containing any silicon crystal grains of a crystal grain size of about 0.1 µm or more is equal to or less than five.