Study on Structure Properties Casted with Mg-Y-Nd-Gd-Zn-Zr Magnesium Alloy

Abstract:

Mg-Y-Nd-Gd-Zn-Zr magnesium alloys with six different compositions are prepared through sand casting. A research shall be conducted on the casting structure and mechanical properties at room temperature of this magnesium alloys and the effect of main alloying rare earth elements of Y, Gd and Nd is researched through analysis on the test data of mechanical properties. It is seen from the research: In as-as-cast alloys, Y and Gd have a larger solid solubility, which are tend to uniform distribution in the alloy but there is much more Nd to precipitate. The second phase is mainly covered by Mg₁₂Nd and a few of Mg₂₄Y₅ and Mg₅Gd which are in form of block, globularity and strip. After T6 treatment, a large number of intermetallic compounds of Mg₂₄Y₅ with Y are precipitated from the alloy and the second phase has changed significantly in size and morphology which is uniformly and widely distributed in the grain and grain boundary with a good strengthening effect. When a few of Gd is added, the strength and plasticity of matrix alloy are improved. With the adding of Gd, the precipitated phase of microstructure is also increased which is tend to coarsening and segregation so as to have an effect on its mechanical properties.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 630-637
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.630
• Online since: August 2013
• Authors: Zhi Wei Huang*, Gao Zhan Zhao, Yuan Yuan Wan, Jian Quan Tao
• Keywords: As-Cast Structure, Magnesium Alloy, Mechanical Property, Solid Solution

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