The mechanism of aqueous stress-corrosion cracking of α + β titanium alloys
| Autor: | Bruce Hinton, Sheng Cao, Xiaobo Chen, Su-Ming Zhu, James C. Williams, Rodney R. Boyer, Xinhua Wu, Xigen Zhou, Chao Voon Samuel Lim |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Aqueous solution Materials science Hydrogen General Chemical Engineering Metallurgy chemistry.chemical_element 02 engineering and technology General Chemistry Plasticity 021001 nanoscience & nanotechnology 01 natural sciences Corrosion Crystallography chemistry 0103 physical sciences General Materials Science Dislocation Stress corrosion cracking 0210 nano-technology Hydrogen embrittlement Titanium |
| Zdroj: | Corrosion Science. 125:29-39 |
| ISSN: | 0010-938X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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