| 摘要 |
A method for nodulizing silicon crystals in casting Aluminum-(8-12%)-Silicon alloys is described. An initial alloy melt is refined by addition of a master alloy containing elements of titanium, phosphorous, boron, zirconium and rare earths to the initial molten alloy, and then through conventional heat treatment and aging. Testing the alloys shows that the nodulized silicon crystals are blunted in shape and well distributed, resulting in a high resistance to wear and high ultimate tensile strength at room temperature and at 300° C. Machinability of the Al-Si alloys is also greatly improved by the process.
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