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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >New investigation of phase equilibria in the system Al-Cu-Si
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New investigation of phase equilibria in the system Al-Cu-Si

机译：Al-Cu-Si体系中相平衡的新研究

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摘要

The phase equilibria and invariant reactions in the system Al-Cu-Si were investigated by a combination of optical microscopy, powder X-ray diffraction (XRD), differential thermal analysis (DTA) and electron probe micro analysis (EPMA). Isothermal phase equilibria were investigated within two isothermal sections. The isothermal section at 500 °C covers the whole ternary composition range and largely confirms the findings of previous phase diagram investigations. The isothermal section at 700 °C describes phase equilibria only in the complex Cu-rich part of the phase diagram. A new ternary compound T was found in the region between (Al,Cu)-γ_1 and (Cu,Si)-7 and its solubility range was determined. The solubility of Al in K-CuSi was found to be extremely high at 700 °C. In contrast, no ternary solubility in the β-phase of Cu-Al was found, although this phase is supposed to form a complete solid solution according to previous phase diagram assessments. Two isopleths, at 10 and 40 at.% Si, were investigated by means of DTA and a partial ternary reaction scheme (Scheil diagram) was constructed, based on the current work and the latest findings in the binary systems Al-Cu and Cu-Si. The current study shows that the high temperature equilibria in the Cu-rich corner are still poorly understood and additional studies in this area would be favorable.
机译：通过光学显微镜，粉末X射线衍射（XRD），差热分析（​​DTA）和电子探针显微分析（EPMA）的组合研究了Al-Cu-Si系统中的相平衡和不变反应。在两个等温段内研究了等温相平衡。 500°C下的等温截面涵盖了整个三元组成范围，并在很大程度上证实了先前相图研究的结果。 700°C的等温部分仅在相图的复杂富铜部分中描述了相平衡。在（Al，Cu）-γ_1和（Cu，Si）-7之间的区域中发现了新的三元化合物T，并确定了其溶解度范围。发现Al在K-CuSi中的溶解度在700℃下极高。相反，尽管根据先前的相图评估认为该相可形成完整的固溶体，但未发现其在Cu-Al的β相中具有三元溶解度。根据目前的工作和在二元体系Al-Cu和Cu-中的最新发现，通过DTA研究了Si的10％和40at。％的两个同位素，并构建了部分三元反应方案（谢尔图）。硅。当前的研究表明，对富含铜的角部的高温平衡仍知之甚少，对此领域的进一步研究将是有利的。

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