Abstract
A special constant deflection device for TEM has been designed, and then change of dislocation configuration ahead of a crack tip during stress corrosion cracking (SCC) of brass in water and of Ti-24Al-11Nb alloy in methanol and initiation of SCC can be observed in TEM. In situ tensile test in TEM for brass was carried out for comparison. The results show that anodic dissolution during SCC can facilitate dislocation emission, multiplication and motion, and a dislocation free zone (DFZ) is formed. The stress at a particular site in the DFZ, which is an elastic zone and is thinned gradually through corrosion-enhanced dislocation emission and motion, is possibly up to the cohesive strength, resulting in initiating of a nanocrack of SCC in the DFZ or sometimes at the crack tip. Because of the action of the corrosion solution the nanocrack of SCC propagates into a cleavage or intergranular microcrack rather than blunts into a void like in situ tension in TEM.
| Original language | English |
|---|---|
| Pages (from-to) | 235-242 |
| Number of pages | 8 |
| Journal | Science in China, Series E: Technological Sciences |
| Volume | 40 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1997 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- General Materials Science
- General Engineering
Keywords
- Brass
- Corrosion-enhanced dislocation emission and motion
- Stress corrosion cracking
- Ti-24Al11Nb