Pollution-free grain refinement of cast TiAl alloys by vacuum mechanical vibration solidification

Junqing Yao, Suo Fan, Xinwang Liu*, Xianfei Ding, Hong Huang, Weifeng Wu, Qiang Wang, Liang Wang, Yanqing Su

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The implementation of the well-known methods for grain refinement of cast TiAl alloys, such as boron refiner, leads to compositional pollution and deterioration of specific types of performances. The development of pollution-free grain refinement methods is of crucial importance in aviation industries. Along these lines, in this work, a pollution-free grain refinement method was developed using the vacuum mechanical vibration (VMV) solidification technique. More specifically, a significant microstructure refinement of a typical Ti–48Al–2Cr–2Nb alloy was achieved, with the average grain size refined from the initial value of 141 μm–72 μm. As a result, the yield strength and compressive strength were both increased, almost without the sacrifice of the peak strain, which nearly overcome the strength-ductility trade-off with simple processing.

Original languageEnglish
Article number144630
JournalMaterials Science and Engineering: A
Volume865
DOIs
Publication statusPublished - 16 Feb 2023
Externally publishedYes

Keywords

  • Grain refinement
  • Mechanical property
  • Microstructure
  • TiAl alloy
  • Vacuum mechanical vibration

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Yao, J., Fan, S., Liu, X., Ding, X., Huang, H., Wu, W., Wang, Q., Wang, L., & Su, Y. (2023). Pollution-free grain refinement of cast TiAl alloys by vacuum mechanical vibration solidification. Materials Science and Engineering: A, 865, Article 144630. https://doi.org/10.1016/j.msea.2023.144630