Abstract
An equiatomic B2 NiTi alloy, severely deformed by high-pressure torsion, was investigated. Nanocrystallization of the as-deformed amorphous matrix has been examined. The formation of internal porosity after long-time annealing was established by the radiotracer technique. Such a porosity prohibited reliable measurements of grain boundary diffusion of the 44Ti tracer in the nanocrystallized NiTi alloy. The percolating porosity does not exist in the as-deformed state of NiTi alloy; its formation was affected by free volume redistribution during nanocrystallites' growth under residual stresses. The atomic force microscopy study reveals a highly modified surface with average roughness of about 50 nm after annealing the samples at 600 K for 7 d.
Original language | English |
---|---|
Title of host publication | Supplemental Proceedings |
Subtitle of host publication | Materials Fabrication, Properties, Characterization, and Modeling |
Publisher | John Wiley and Sons Inc. |
Pages | 147-154 |
Number of pages | 8 |
Volume | 2 |
ISBN (Electronic) | 9781118062142 |
ISBN (Print) | 9781118029466 |
DOIs | |
Publication status | Published - Apr 20 2011 |
Externally published | Yes |
Keywords
- Grain boundary
- Nanocrystalline material
- Porosity
ASJC Scopus subject areas
- General Engineering
- General Materials Science