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Microstructure, Texture, and Mechanical Properties of Mg-Zn-Y-Nd-Zr Alloys
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1.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;2.National Engineering Research Center for Magnesium Alloys, Chongqing 400044, China

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Fund Project:

National Natural Science Foundation of China (52171103); Guangdong Major Project of Basic and Applied Basic Research (2020B0301030006)

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    Abstract:

    The microstructure and mechanical properties of Mg-Zn-Y-Nd-Zr alloys were studied in this research. Results show that the added Nd element partially replaces the Y element in the W phase (Mg3Zn3Y2), forming a new secondary phase Mg3Zn3(Y, Nd)2. A typical bimodal structure consisting of fine equiaxed recrystallized grains and coarse elongated unrecrystallized grains can be observed in the alloy after thermal extrusion. The Nd addition promotes the dynamic recrystallization during hot extrusion. With increasing the Nd content, the dynamic recrystallization ratio is increased, and the overall texture strength of the as-extruded alloy is weakened. The addition of Nd element refines the grains and improves the mechanical properties of Mg-Zn-Y-Zr alloy. When 0.5wt% Nd is added, the mechanical properties of as-extruded alloy show a good combination of high strength and high plasticity: the yield strength is 362 MPa, the ultimate tensile strength is 404 MPa, and the elongation is 10.2%. After aging treatment, the tensile strength of the alloy is further improved, and the ultimate tensile strength of the alloy after peak aging treatment reaches 421 MPa. The high strength of the Mg-Zn-Y-Nd-Zr alloy is mainly attributed to ultrafine recrystallized grains and precipitation strengthening.

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[Ziyi Wanga, Xianhua Chena, Yankai Shu, Jianbo Li, Yuan Yuan, Jun Tan, Fusheng Pan. Microstructure, Texture, and Mechanical Properties of Mg-Zn-Y-Nd-Zr Alloys[J]. Rare Metal Materials and Engineering,2022,51(9):3138~3145.]
DOI:10.12442/j. issn.1002-185X.20210666

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History
  • Received:July 23,2021
  • Revised:November 19,2021
  • Adopted:January 22,2022
  • Online: September 30,2022
  • Published: September 27,2022