The phase diagram of the Al–Cu–Si ternary system was investigated experimentally at the temperatures 600 °C and 800 °C. The current study was designed to contribute to a better understanding of the ternary phase diagram Al–Cu–Si at elevated temperatures, where some of the phase equilibria were only tentatively known. It was found that the ternary phase τ proposed earlier is actually an extended solid solution of Al in the CuSi_δ phase. At 700 °C, the phase CuSi_δ is stable as a pseudo ternary phase, and the existence of a significantly extended thermal stability range in the ternary was also confirmed by DSC measurements. In agreement with previous isothermal sections at other temperatures, a huge solubility of aluminum in CuSi_κ and negligible solubility of Si in AlCu_β was observed.

中文翻译：

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三元相图 Al-Cu-Si 在 600 °C 和 800 °C 下的实验等温截面

在 600 °C 和 800 °C 的温度下实验研究了 Al-Cu-Si 三元系统的相图。目前的研究旨在帮助更好地理解高温下的三元相图 Al-Cu-Si，其中一些相平衡只是暂时已知的。发现早先提出的三元相τ实际上是Al在CuSi_δ相中的扩展固溶体。在 700 °C 时，CuSi_δ 相作为伪三元相是稳定的，并且通过 DSC 测量也证实了三元中存在显着扩展的热稳定性范围。与之前在其他温度下的等温截面一致，观察到铝在 CuSi_κ 中的巨大溶解度和 Si 在 AlCu_β 中的可忽略不计的溶解度。