Strengthening Effect of Y2O3 on AZ92 Magnesium Alloy Using Stir Casting Process
| Autor: | M.E. Moussa, Waleed Khalifa, Shimaa El-Hadad |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
020502 materials Alloy Metals and Alloys 02 engineering and technology engineering.material Microstructure Industrial and Manufacturing Engineering 020501 mining & metallurgy 0205 materials engineering Mechanics of Materials Phase (matter) Ultimate tensile strength Materials Chemistry engineering Grain boundary Composite material Magnesium alloy Ductility Solid solution |
| Zdroj: | International Journal of Metalcasting. 15:818-828 |
| ISSN: | 2163-3193 1939-5981 |
| Popis: | Strengthening effect of Y2O3 on AZ92 magnesium alloy using stir casting process has been investigated. Nominal amounts of Y2O3 (0, 1, 1.5, 2, 2.5 and 3 in wt%) were added into the melt vortex in the form of preformed master powder (Mg–30 wt% Y2O3) to improve their wettability with molten AZ92 alloy. The results showed clearly that without Y2O3 addition, the microstructure of the investigated alloy is composed of α-Mg which appeared as coarse dendritic structure, divorced eutectic-containing massive β-Mg17Al12 phase and super-saturated α-Mg solid solution. With Y2O3 addition, the distribution of Y2O3 particles was found within the inter-dendritic regions of the primary α-Mg phase. At 2.5 wt% Y2O3, a near uniform distribution of Y2O3 particles along the grain boundaries of AZ92 alloy matrix was successfully obtained. However, further addition resulted in agglomeration of Y2O3 particles at 3 wt% addition level. The average tensile strength of the investigated AZ92 alloy was increased from 169 MPa to 198 MPa without a significant reduction in its ductility at optimum addition of 2.5 wt% Y2O3. The fracture mechanism has been also investigated. |
| Databáze: | OpenAIRE |
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