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采用电阻炉在780~820℃下冶炼纯度为99.85%的工业纯铝等原料,加入中间合金变质得到一定成分配比的活塞硅铝合金。改变合金中铜的含量制成相应试样,观察其显微组织随铜含量的变化,测试了试样在室温和300℃高温下的抗拉强度。结果表明:当合金中含Cu量从0%增加到1.0%、2.5%时,含Ni相由块状Al3Ni相依次变化为条带状Al3CuNi相、骨骼状的Al7Cu4Ni相;随Cu含量增加,合金的室温和300℃高温抗拉强度逐步增加。
Using a resistance furnace at 780 ~ 820 ℃ smelting purity of 99.85% of industrial pure aluminum and other raw materials, adding a certain amount of intermediate alloy metamorphosis piston silicon aluminum alloy. The content of copper in the alloy was changed to make the corresponding sample. The microstructure of the sample was observed with the change of copper content. The tensile strength of the sample at room temperature and 300 ℃ was tested. The results show that when the content of Cu in the alloy increases from 0% to 1.0% and 2.5%, the Ni-containing phase changes from bulk Al3Ni phase to Al3CuNi phase and skeletal Al7Cu4Ni phase. With the increase of Cu content, The room temperature and 300 ℃ high temperature tensile strength gradually increased.