Influence of αs precipitates on electrochemical performance and mechanical degradation of Ti-1300 alloy

Jinwen Lu*, Xirong Yang, Yongqing Zhao, Longlong Dong, Yongqing Fu, Yan Du, Wei Zhang, Yusheng Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
5 Downloads (Pure)

Abstract

The influence of αs precipitates on electrochemical behavior and mechanical degradation of Ti-1300 alloy in artificial seawater have been studied. The results show that corrosion resistance and mechanical degradation have been significantly affected by the formation of acicular αs precipitates. The precipitated αs phase with an acicular shape around 40–60 nm in width are uniformly distributed inside β grain. Many αs precipitates are intersected each other and keep a well-defined Burgers orientation relationship with β matrix, which restricts the growth of other αs phases due to pinning effect. Within the electrolyte, the αs phases can form “microgalvanic cells” with their adjacent intergranular β phases, which dramatically deteriorate its corrosion resistance. The mechanical properties of the alloy are also degraded with the increase of immersion time due to the pitting reaction. The precipitated microstructure exhibits an inferior mechanical degradation behavior, and this is mainly because a lot of corrosion cavities are nucleate d and propagated at the interface between αs precipitates and prior β grains.

Original languageEnglish
Pages (from-to)88-101
Number of pages14
JournalJournal of Alloys and Compounds
Volume803
Early online date22 Jun 2019
DOIs
Publication statusPublished - 30 Sep 2019

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