Microstructural Influences on High Cycle Fatigue Crack Initiation Mechanism in Ti-Al-Mo-Cr-V-Nb-Zr-Sn Metastable β Titanium Alloy

Chenxi Zhao, Yongxin Wang, Rui Hu, Guoqiang Shang, Yuxue Wu, Yunmei Lu

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, the high cycle fatigue behavior and tensile properties of Ti-Al-Mo-Cr-V-Nb-Zr-Sn titanium alloy at room temperature with a basketweave structure and bimodal structure were studied. The results show that the fatigue strength of the basketweave structure is higher, while the balance of strength and plasticity of the bimodal microstructure is better. However, the fatigue performance of the bimodal microstructure is unstable due to the bilinear phenomenon of the S-N curve. By fractographic analysis and the study of the crystal orientation, as well as the slip traces of the primary α grains and β matrix at the facets, it was found that the facets are formed on the { (Formula presented.) }< (Formula presented.) > slip system with the highest Schmid factor, and the microcracks grow along the { (Formula presented.) }< (Formula presented.) > slip system in the β grain, but the driving force of microcrack propagation may exceed the restriction of crystallographic orientation. Based on the conclusions above, the phenomenological models of the fatigue crack initiation mechanism of Ti-Al-Mo-Cr-V-Nb-Zr-Sn titanium alloy are established.

Original languageEnglish
Article number336
JournalMaterials
Volume18
Issue number2
DOIs
StatePublished - Jan 2025

Keywords

  • crack initiation
  • facet
  • high cycle fatigue
  • metastable β titanium alloy
  • microstructure

Fingerprint

Dive into the research topics of 'Microstructural Influences on High Cycle Fatigue Crack Initiation Mechanism in Ti-Al-Mo-Cr-V-Nb-Zr-Sn Metastable β Titanium Alloy'. Together they form a unique fingerprint.

Cite this