High fatigue performance and microscopic mechanisms of in-situ TiB2/7050Al composite at different temperatures

Liufang Ma, Xian Luo, Hong Wang, Rui Hu, Xiaowei Yi, Chaoxian Zhou, Wei Chen, Gang Ran

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this work, the fatigue properties of in-situ TiB2 particle-reinforced 7050 Al-matrix (TiB2/7050Al) composites at room temperature (RM), 100 ℃ and 150 ℃ were studied, respectively, and the microstructure changes, fatigue fracture characteristics and fracture mechanism were analyzed. The results indicate that when the fatigue temperature increased, the amount of S phase precipitation along grain boundaries increases, forming a banded distribution with TiB2 particles near the grain boundary regions. The RM fatigue limit of the composite is high up to 307.5 MPa. Under the same fatigue strength, TiB2/7050 composites can withstand fatigue cycles far greater than 7050Al alloy. With the increase of temperature, the fatigue performance of the composite gradually decreased, and unlike at RM and 100 ℃, the use of Weibull three-parameter model is necessary to obtain a satisfactory S-N curve at 150 ℃. In some locations of the steady-state crack propagation stage, the direction and spacing of fatigue striations were influenced by grain orientation, grain boundaries and TiB2 particle bands. Therefore, the effects of TiB2 particles, grain boundaries, and precipitations on the fatigue processes were analyzed to reveal the strengthening mechanisms of the composite.

Original languageEnglish
Article number108372
JournalInternational Journal of Fatigue
Volume185
DOIs
StatePublished - Aug 2024

Keywords

  • Al-matrix composite
  • Crack initiation and propagation
  • Fatigue fracture
  • High temperature fatigue performance
  • TiB particle

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