Design perspectives for creep-resistant magnesium die-casting alloys
| Autor: | Bimal K. Kad, Qingyou Han, Srinath Viswanathan |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Philosophical Magazine. 84:3843-3860 |
| ISSN: | 1478-6443 1478-6435 |
| DOI: | 10.1080/14786430412331283073 |
| Popis: | The microstructure of die-cast magnesium alloys is highly non-uniform, which leads to a non-uniform distribution of the solidus/homologous temperature in the α(Mg) phase and a non-uniform distribution of deformation stresses and strains in the specimen during creep testing. Experimental observations suggest that significant creep deformation occurs in the α(Mg) phase in and adjacent to the eutectic regions while deformation in the primary α(Mg) dendrites is less pronounced. This article addresses the effect of the non-uniform as-cast microstructure on the creep resistance of die-cast magnesium alloys. Computational thermodynamic simulations were carried out to determine solute segregation, solidus temperature, and the corresponding homologous temperature distribution in the α(Mg) phase. Transmission electron microscopy studies provided evidence of non-uniform creep deformation in the creep-tested specimens. The results suggest that the creep resistance of magnesium alloys is determined by the weakest aggr... |
| Databáze: | OpenAIRE |
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