| Autor: |
Tan, Qing, Yan, Zhiran, Wang, Huijun, Dye, David, Antonov, Stoichko, Gault, Baptiste |
| Rok vydání: |
2022 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
The corrosion potential of commercially pure titanium in NaCl solutions is dramatically affected by trace Fe additions, which cause the appearance of submicron pockets of \b{eta} phase at grain boundary triple points. Furthermore, the low solubility of hydrogen in hexagonal close-packed {\alpha}-Ti makes titanium alloys prone to subsequent hydride-associated failures due to stress corrosion cracking. We analyzed {\alpha}-{\alpha} and {\alpha}-\b{eta} sections of the abutting grain boundary of a \b{eta} pocket in a Grade 2 CP-Ti, and the {\alpha}-\b{eta} phase boundary. Fe and H partition to \b{eta} and segregate at the grain boundary, but no segregation is seen at the {\alpha}-\b{eta} phase boundary. In contrast, a significant Ni (>1 at%) accumulation is observed at the {\alpha}-\b{eta} phase boundary. We propose that the \b{eta}-pockets act as hydrogen traps and facilitate the nucleation and growth of hydrides along grain boundaries in CP-Ti. |
| Databáze: |
arXiv |
| Externí odkaz: |
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