Insight from in situ microscopy into which precipitate morphology can enable high strength in magnesium alloys

Bo Yu Liu, Nan Yang, Jian Wang, Matthew Barnett, Yun Chang Xin, Di Wu, Ren Long Xin, Bin Li, R. Lakshmi Narayan, Jian-Feng Nie, Ju Li, Evan Ma, Zhi-Wei Shan

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24 Citations (Scopus)

Abstract

Magnesium alloys, while boasting light weight, suffer from a major drawback in their relatively low strength. Identifying the microstructural features that are most effective in strengthening is therefore a pressing challenge. Deformation twinning often mediates plastic yielding in magnesium alloys. Unfortunately, due to the complexity involved in the twinning mechanism and twin-precipitate interactions, the optimal precipitate morphology that can best impede twinning has yet to be singled out. Based on the understanding of twinning mechanism in magnesium alloys, here we propose that the lamellar precipitates or the network of plate-shaped precipitates are most effective in suppressing deformation twinning. This has been verified through quantitative in situ tests inside a transmission electron microscope on a series of magnesium alloys containing precipitates with different morphology. The insight gained is expected to have general implications for strengthening strategies and alloy design.

Original languageEnglish
Pages (from-to)1061-1066
Number of pages6
JournalJournal of Materials Science and Technology
Volume34
Issue number7
DOIs
Publication statusPublished - 1 Jul 2018

Keywords

  • Deformation twinning
  • In-situ TEM
  • Mechanical property
  • Mg alloy
  • Precipitate selection criterion

Cite this

Liu, B. Y., Yang, N., Wang, J., Barnett, M., Xin, Y. C., Wu, D., Xin, R. L., Li, B., Narayan, R. L., Nie, J-F., Li, J., Ma, E., & Shan, Z-W. (2018). Insight from in situ microscopy into which precipitate morphology can enable high strength in magnesium alloys. Journal of Materials Science and Technology, 34(7), 1061-1066. https://doi.org/10.1016/j.jmst.2018.01.017