Investigating the stress corrosion cracking of a biodegradable Zn-0.8 wt%Li alloy in simulated body fluid

Guan-Nan Li, Su-Ming Zhu, Jian-Feng Nie, Yufeng Zheng, Zhili Sun

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Stress corrosion cracking (SCC) may lead to brittle, unexpected failure of medical devices. However, available researches are limited to Mg-based biodegradable metals (BM) and pure Zn. The stress corrosion behaviors of newly-developed Zn alloys remain unclear. In the present work, we conducted slow strain rate testing (SSRT) and constant-load immersion test on a promising Zn-0.8 wt%Li alloy in order to investigate its SCC susceptibility and examine its feasibility as BM with pure Zn as control group. We observed that Zn-0.8 wt%Li alloy exhibited low SCC susceptibility. This was attributed to variations in microstructure and deformation mechanism after alloying with Li. In addition, both pure Zn and Zn-0.8 wt%Li alloy did not fracture over a period of 28 days during constant-load immersion test. The magnitude of applied stress was close to physiological condition and thus, we proved the feasibility of both materials as BM.

Original languageEnglish
Pages (from-to)1468-1478
Number of pages11
JournalBioactive Materials
Volume6
Issue number5
DOIs
Publication statusPublished - May 2021

Keywords

  • Biodegradable metals
  • Constant-load immersion test
  • Slow strain rate testing
  • Stress corrosion
  • Zn-0.8 wt%Li alloy

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