Microstructure, mechanical properties and fracture behaviors of large-scale sand-cast Mg-3Y-2Gd-1Nd-0.4Zr alloy

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  • Lixiang Yang
  • Yuanding Huang
  • Zhengquan Hou
  • Lv Xiao
  • Yuling Xu
  • Xiwang Dong
  • Fei Li
  • Gerrit Kurz
  • Baode Sun
  • Zhongquan Li
  • Norbert Hort

In order to improve the ductility of commercial WE43 alloy and reduce its cost, a Mg-3Y-2Gd-1Nd-0.4Zr alloy with a low amount of rare earths was developed and prepared by sand casting with a differential pressure casting system. Its microstructure, mechanical properties and fracture behaviors in the as-cast, solution-treated and as-aged states were evaluated. It is found that the aged alloy exhibited excellent comprehensive mechanical properties owing to the fine dense plate-shaped β' precipitates formed on prismatic habits during aging at 200 °C for 192 hrs after solution-treated at 500 °C for 24 hrs. Its ultimate tensile strength, yield strength, and elongation at ambient temperature reach to 319 ± 10 MPa, 202 ± 2 MPa and 8.7 ± 0.3% as well as 230 ± 4 MPa, 155 ± 1 MPa and 16.0 ± 0.5% at 250 °C. The fracture mode of as-aged alloy was transferred from cleavage at room temperature to quasi-cleavage and ductile fracture at the test temperature 300 °C. The properties of large-scale components fabricated using the developed Mg-3Y-2Gd-1Nd-0.4Zr alloy are better than those of commercial WE43 alloy, suggesting that the new developed alloy is a good candidate to fabricate the large complex thin-walled components.

Original languageEnglish
JournalJournal of Magnesium and Alloys
Issue number8
Pages (from-to)2763-2775
Number of pages13
Publication statusPublished - 01.08.2023

Bibliographical note

This work was funded by the National Natural Science Foundation of China (No. U2037601 and No. 52074183). The authors appreciate Ge Chen, Wenbin Zou as well as Shiwei Wang for preparing the alloys, Wenyu Liu as well as Xuehao Zheng from ZKKF(Beijing) Science & Technology Co. Ltd for the TEM measurement, Gert Wiese as well as Petra Fischer for SEM and hardness measurement and Yunting Li from the Instrument Analysis Center of Shanghai Jiao Tong University (China) for SEM measurement. Lixiang Yang also gratefully thanks the China Scholarship Council (201906230111) for awarding a fellowship to support his study stay at Helmholtz-Zentrum Geesthacht.

    Research areas

  • Ductility, Large-scale sand-cast, Magnesium alloy, WE43
  • Engineering