| 摘要 |
A piston formed from an Al-Si alloy having an average Si composition includes a high wear region having a surface that is Si-rich with respect to the average Si composition of the Al-Si alloy. The surface of the predetermined high wear region is treated, as by etching, to selectively remove Al from the surface to produce the Si-rich region. The Si-rich region has improved resistance to wear. The piston may be treated to produce one or more high wear regions which are Si-rich with respect to the average Si composition of the alloy. High wear regions may include the annular grooves for receiving a piston ring, the piston skirt and the pin bore.
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