Preparation of Mg-TM-Y (TM=Transition Metal) Alloys with Long Period Stacking Ordered Phase and their Superior Mechanical Properties

Abstract:

Mg-Ni-Y alloy with composition ratio of 1 : 2 (Ni : Y) consisted of Mg, and 18R-type long period stacking ordered (LPSO) phases, whereas composition ratio of 1 : 1 (Ni : Y) consisted of Mg,14H-type LPSO and Mg₂Ni phases, respectively. After hot-rolling at 693K, strong basal texture parallel to the plane sheet was formed in the LPSO, and Mg phases. Tensile test was performed along rolling direction (R.D) from room temperature (R.T) to 573K. The Mg₉₈Ni₁Y₁, Mg₉₆Ni₂Y₂, Mg₉₄Ni₃Y₃, Mg₉₇Ni₁Y₂ and Mg₉₄Ni₂Y₄ rolled sheets exhibited 0.2% proof stress (σ_0.2) of 232MPa, 255MPa, 358MPa, 337MPa and 393MPa, and elongation (δ) of 6%, 5%, 7%, 15% and 7% at R.T, respectively. The σ_0.2 of the Mg-Ni-Y rolled sheet tend to increase with increasing of area fraction of the LPSO phase. After annealing at 773K for 0.6ks, the δ of Mg-Ni-Y rolled sheet tend to increase, while the σ_0.2 decreased due to randomization of the Mg phase by re-crystallization. The Mg-Ni-Y rolled sheets exhibited high σ_0.2 above 200MPa at 473K. Additionally, it was noted that σ_0.2 of the Mg₉₄Ni₂Y₄ rolled sheet exhibited 329MPa at 473K and 211MPa at 573K. Thus, the LPSO phase have high thermal stability and is attribute to strengthening of the Mg-Ni-Y alloy sheet at high temperature.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 815-819
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.815
• Online since: November 2016
• Authors: Takaomi Itoi*
• Keywords: LPSO, Mechanical Properties, Mg-Ni-Y, Microstructure

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