The mechanism of aqueous stress-corrosion cracking of α + β titanium alloys

Sheng Cao, Suming Zhu, Chao Voon Samuel Lim, Xigen Zhou, Xiaobo Chen, Bruce R. W. Hinton, Rodney R. Boyer, James C. Williams, Xinhua Wu

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In a previous paper (Cao et al., 2017) [1], a transition in fracture mode in aqueous NaCl Stress-Corrosion Cracking (SCC) of Ti-8Al-1Mo–1 V was reported. This paper attempts to unravel the operating mechanism for SCC by dislocation analysis on the Focus Ion Beam (FIB) lift-out foils from pre-crack and the SCC regions. It is shown that both basal <a> and <c + a> slips are operative in the SCC region while the basal <a> is the only activated system in the pre-crack region. Moreover, there is an increase in dislocation density in the SCC region compared to the pre-crack region. Based on these observations, combined Absorption Induced Dislocation Emission (AIDE) and Hydrogen Enhanced Localized Plasticity (HELP) is proposed to be the operating mechanisms for SCC in α+β titanium alloys.

Original languageEnglish
Pages (from-to)29-39
Number of pages11
JournalCorrosion Science
Volume125
DOIs
Publication statusPublished - 15 Aug 2017

Keywords

  • A. Titanium
  • B. SEM
  • B. TEM
  • C. Hydrogen embrittlement
  • C. Stress corrosion

Cite this

Cao, Sheng ; Zhu, Suming ; Lim, Chao Voon Samuel ; Zhou, Xigen ; Chen, Xiaobo ; Hinton, Bruce R. W. ; Boyer, Rodney R. ; Williams, James C. ; Wu, Xinhua. / The mechanism of aqueous stress-corrosion cracking of α + β titanium alloys. In: Corrosion Science. 2017 ; Vol. 125. pp. 29-39.
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abstract = "In a previous paper (Cao et al., 2017) [1], a transition in fracture mode in aqueous NaCl Stress-Corrosion Cracking (SCC) of Ti-8Al-1Mo–1 V was reported. This paper attempts to unravel the operating mechanism for SCC by dislocation analysis on the Focus Ion Beam (FIB) lift-out foils from pre-crack and the SCC regions. It is shown that both basal and slips are operative in the SCC region while the basal is the only activated system in the pre-crack region. Moreover, there is an increase in dislocation density in the SCC region compared to the pre-crack region. Based on these observations, combined Absorption Induced Dislocation Emission (AIDE) and Hydrogen Enhanced Localized Plasticity (HELP) is proposed to be the operating mechanisms for SCC in α+β titanium alloys.",
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The mechanism of aqueous stress-corrosion cracking of α + β titanium alloys. / Cao, Sheng; Zhu, Suming; Lim, Chao Voon Samuel; Zhou, Xigen; Chen, Xiaobo; Hinton, Bruce R. W.; Boyer, Rodney R.; Williams, James C.; Wu, Xinhua.

In: Corrosion Science, Vol. 125, 15.08.2017, p. 29-39.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Zhu, Suming

AU - Lim, Chao Voon Samuel

AU - Zhou, Xigen

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AU - Hinton, Bruce R. W.

AU - Boyer, Rodney R.

AU - Williams, James C.

AU - Wu, Xinhua

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