Microstructural Characterization of Mg-TM (TM=Ni or Cu) - Y Alloys and their Mechanical Property

Abstract:

Microstructure and mechanical property of the Mg-TM (TM=Ni or Cu) -Y alloys were investigated. Results revealed that Mg phase, Long period stacking ordered (LPSO) phase, and Mg₂TM phase were formed in the Mg-TM-Y alloy around the composition ratios of TM and Y are 1:1 or 1:2. Tensile test clearly showed relationship between the mechanical property and microstructure in Mg-Ni-Y cast alloy. The 0.2% proof stress (σ_0.2) of the Mg-Ni-Y cast alloy increase with the increasing solute elements contents, while the elongation decreases. This result indicated that the Mg-TM-Y alloy with the composition ratios of TM and Y are 1:1 or 1:2 have both high proof stress and appropriate elongation. It was suggested that the LPSO phase was appropriate strengthening phase in the Mg-rich region in the Mg-TM-Y alloy system. Basal texture of the LPSO and Mg phases was formed by hot-rolling in the sheet plane and the Mg₂TM phase was dispersed in the Mg phase. The Mg₉₇Cu₁Y₂ rolled sheet showed highσ_0.2 about 350 MPa at room temperature. Furthermore, formation of an oxide film on the Mg-Cu-Y alloy was investigated at 973 K in air. As a result, it was suggested that the Y₂O₃ film was formed on the re-melted Mg-Cu-Y alloy surface as an incombustible oxide film.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 802-807
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.802
• Online since: December 2018
• Authors: Takaomi Itoi*, Yoshiki Tomura
• Keywords: LPSO, Magnesium Alloy, Mechanical Properties, Microstructure, Oxide Film

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