The Effect of Ni on the High-Temperature Strength of Al-Si Cast Alloys
| Autor: | Florian Stadler, Helmut Kaufmann, Helmut Antrekowitsch, Werner Fragner, Peter J. Uggowitzer |
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| Rok vydání: | 2011 |
| Předmět: |
Chemical substance
Materials science Silicon Annealing (metallurgy) Mechanical Engineering Alloy Metallurgy chemistry.chemical_element engineering.material Condensed Matter Physics Nickel chemistry Mechanics of Materials Ultimate tensile strength Eutectic bonding engineering General Materials Science Eutectic system |
| Zdroj: | Materials Science Forum. 690:274-277 |
| ISSN: | 1662-9752 |
| Popis: | In order to investigate the effect of Ni on the high-temperature strength of Al-Si cast alloys, tensile properties of hypoeutectic and eutectic alloys were determined at 250 °C after long-term annealing at test temperature. LOM- and SEM-analysis revealed the existence of Al3Ni-phases in close contact to eutectic Si. It was shown that the strength can be increased by the addition of Ni, though just to a certain level, depending on the fraction of eutectic phase in the alloy. The alloys were considered as a coarse two-phase system where a hardening effect is caused by load transfer to the harder phase, which requires a certain connectivity/contiguity of the latter. The paper describes the extent of contiguity of the eutectic as well as the hard silicon and Al3Ni-phases within the eutectic, and discusses their contribution to an enhanced strength of Al-Si alloys at elevated temperatures. |
| Databáze: | OpenAIRE |
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