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Al – Cu – Si Aluminium – Copper – Silicon
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lukas, Hans Leo Lebrun, Nathalie |
| Copyright Year | 2005 |
| Abstract | In the early work the Al corner was investigated by thermal analysis, by optical micrographs [1923Wet, 1928Gwy, 1931Ura, 1953Phi, 1975Kuz] and by measuring the electric resistivity [1940Wie]. A ternary eutectic Lo2+(Al)+Si was found at 525°C [1923Wet, 1928Gwy, 1931Ura, 1975Kuz], at 524°C [1953Phi] or 522°C [1936His]. The temperature given by [1984Oya], 512°C, deviates considerably. The growth of this eutectic is complex due to the coarsening during solidification [1983Sch]. Liquidus as well as solidus and solvus of the (Al) solid solution were determined in very detail by [1953Phi]. The papers agree well. [1968Epi] gave three vertical sections at 5, 8 and 10 mass% Si up to 55 mass% Cu. The eutectic agrees well with the previously mentioned papers, whereas the liquidus surface disagrees. In the section at 8 mass% Si the boundary of L against L+Si in the interval 29 to 39 mass% Cu go from 580 to 590°C. L+Si tie lines go from the points of this boundary to pure Si and pass the 10 mass% Si section between 30 and 40 mass% Cu. In the 10 mass% Si section, however, for this whole range of Cu contents above 580°C single phase liquid is shown. This is a severe contradiction exceeding by far the limits of accuracy of the drawings. The whole ternary system was investigated by thermal analysis and by interpretation of microstructures recorded in micrographs [1934Mat] and [1936His]. Matsuyama [1934Mat] presented 12 vertical sections, a projection of the liquidus surface with the Cu corner enlarged in an extra diagram, and an isothermal section at room temperature. Hisatsune [1936His] reported 16 vertical and four isothermal sections as well as the lines of double saturation of the liquidus. No ternary phase exists in the system. The later detected i phase of the binary Cu-Si system in both papers was not distinguished from the (Cu) solid solution. Between the $ phases of Cu-Al and Cu-Si, continuous solid solubility was found. [1934Mat] assumed complete solid solubilities between the (0 (CuAl) and * (CuSi) phase, whereas [1936His] reported it between * in CuSi and (1 in CuAl. However, these three phases have different crystal structures [V-C], which makes complete miscibility unlikely. The two papers disagree in the 70 to 90 mass% Cu region of the liquidus surface. [1934Mat] shows a large field of primary crystallization of (0-* and a separate one for (1. [1936His] shows smaller fields of primary crystallization for the (0 and g1 phases, but a large one for (1-*. Both papers agree that all binary Al-Cu phases containing more Al than (1 dissolve less than 1 mass% Si. The Cu-Si g phase dissolves about 1 mass% Al, whereas 0, 0' and 0" dissolve between 2 and 3 mass% Al. Part of the Cu-rich corner was investigated by [1948Wil]. The i phase is stabilized by Al and seems to be stable to room temperature inside the ternary system. This was confirmed by [1974Llo]. The $ phase is also stabilized, but decomposes eutectoidally at 545°C [1974Llo] into (Cu), i and (1 (named (2 by [1974Llo]) below both binary eutectoids. Literature published until 1986 is carefully reviewed by [1992Luk] and further updated by the present evaluation. |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/10915967_9 |
| Alternate Webpage(s) | http://extras.springer.com/2005/978-3-540-23118-9/00400011a2/papers/00400011a2/00400011a20142.pdf |
| Alternate Webpage(s) | https://doi.org/10.1007/10915967_9 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
