Abstract
Commercially-pure zirconium is alloyed and dealloyed repeatedly with hydrogen at 810 °C, thereby cyclically triggering phase transformations between hydrogen-free α-Zr and hydrogen-alloyed β-Zr. Under an externally applied tensile stress, the internal mismatch stresses produced by the α-β transformations are biased, resulting in the accumulation of strain increments after each chemical cycle in the direction of the applied stress. Two key parameters, i.e., half-cycle time and applied stress, are examined to determine their effects on the strain increments. A tensile strain of 133% is achieved without fracture after multiple chemical cycles, demonstrating for the first time transformation superplasticity in zirconium induced by isothermal hydrogen cycling.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 5708-5713 |
| Number of pages | 6 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 35 |
| Issue number | 11 |
| DOIs | |
| State | Published - Jun 2010 |
Funding
This work was carried out under the Nuclear R&D Program supported by Ministry of Knowledge Economy, Republic of Korea. HC also acknowledges support from the Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( 2009-0093814 ).
Keywords
- Hydride
- Hydrogen
- Mechanical properties
- Superplastic deformation
- Zirconium
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology