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Strengthening Effect of Y2O3 on AZ92 Magnesium Alloy Using Stir Casting Process

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Abstract

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.

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Acknowledgements

The authors would like to appreciate the financial support from the Central Metallurgical Research and Development Institute (CMRDI), Ministry of Scientific Research, Egypt.

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Authors and Affiliations

  1. Department of Manufacturing Technology, Laboratory of Foundry, Central Metallurgical Research and Development Institute (CMRDI), P.O. 87, Helwan, Egypt

    M. E. Moussa & S. El-Hadad

  2. Department of Mining, Petroleum and Metallurgical Engineering, Faculty of Engineering, Cairo University, P.O. 12613, Giza, Egypt

    W. Khalifa

Authors
  1. M. E. Moussa
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  2. S. El-Hadad
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  3. W. Khalifa
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Correspondence to M. E. Moussa.

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Moussa, M.E., El-Hadad, S. & Khalifa, W. Strengthening Effect of Y2O3 on AZ92 Magnesium Alloy Using Stir Casting Process. Inter Metalcast 15, 818–828 (2021). https://doi.org/10.1007/s40962-020-00509-z

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  • DOI: https://doi.org/10.1007/s40962-020-00509-z

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