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

doi:10.1016/j.corsci.2017.05.025

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 journal › Article › Research › peer-review

51 Citations (Scopus)

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 language	English
Pages (from-to)	29-39
Number of pages	11
Journal	Corrosion Science
Volume	125
DOIs	https://doi.org/10.1016/j.corsci.2017.05.025
Publication status	Published - 15 Aug 2017

Keywords

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

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10.1016/j.corsci.2017.05.025

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title = "The mechanism of aqueous stress-corrosion cracking of α + β titanium alloys",

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.",

keywords = "A. Titanium, B. SEM, B. TEM, C. Hydrogen embrittlement, C. Stress corrosion",

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

year = "2017",

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doi = "10.1016/j.corsci.2017.05.025",

language = "English",

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T1 - The mechanism of aqueous stress-corrosion cracking of α + β titanium alloys

AU - Cao, Sheng

AU - Zhu, Suming

AU - Lim, Chao Voon Samuel

AU - Zhou, Xigen

AU - Chen, Xiaobo

AU - Hinton, Bruce R. W.

AU - Boyer, Rodney R.

AU - Williams, James C.

AU - Wu, Xinhua

PY - 2017/8/15

Y1 - 2017/8/15

N2 - 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.

AB - 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.

KW - A. Titanium

KW - B. SEM

KW - B. TEM

KW - C. Hydrogen embrittlement

KW - C. Stress corrosion

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DO - 10.1016/j.corsci.2017.05.025

M3 - Article

AN - SCOPUS:85020641020

SN - 0010-938X

VL - 125

SP - 29

EP - 39

JO - Corrosion Science

JF - Corrosion Science

ER -

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

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Keywords

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Centre for Electron Microscopy (MCEM)

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

Abstract

Keywords

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Centre for Additive Manufacturing (MCAM)

Centre for Electron Microscopy (MCEM)

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