Microstructural evolution in silicon alloyed γ-Ti–Al alloys after thermomechanical processing
| Autor: | H.M. Flower, S. Heshmati-Manesh |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Equiaxed crystals
Materials science Silicon Mechanical Engineering Metallurgy chemistry.chemical_element Condensed Matter Physics Microstructure Forging Grain growth chemistry.chemical_compound chemistry Mechanics of Materials Silicide Thermomechanical processing General Materials Science Eutectic system |
| Zdroj: | Materials Science and Technology. 15:144-150 |
| ISSN: | 1743-2847 0267-0836 |
| Popis: | The microstructures of silicon alloyed γ-Ti–Al alloys containing silicide particles have been studied after thermomechanical treatments to investigate microstructural evolution. Important parameters including temperature, forging strain, and sequence of thermomechanical treatments were systematically studied. Isothermal forging below the eutectoid temperature resulted in inhomogeneous dynamic recrystallisation with fine equiaxed grains in recrystallised areas and residual α2 + γ lamellae elsewhere. Eutectic silicides play an important role in destruction of the as cast structure by promoting dynamic recrystallisation during deformation and static recrystallisation on subsequent annealing. There is evidence that silicon, in solution, also enhances recrystallisation. The presence of fine silicides produced by precipitation in the solid state restricts the size of grains produced by both dynamic and static recrystallisation. Silicon also alters significantly the phase equilibrium between the α and γ ... |
| Databáze: | OpenAIRE |
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