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) |
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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 |
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