TY - JOUR
T1 - Microstructure and hydrogen storage properties of as-cast and rapidly solidified Ti-rich Ti-V alloys
AU - Suwarno, Suwarno
AU - Solberg, Jan Ketil
AU - Maehlen, Jan Petter
AU - Krogh, Bente
AU - Borresen, Borre Tore
AU - Ochoa-Fernandez, Esther
AU - Rytter, Erling
AU - Williams, Mario
AU - Denys, Roman
AU - Yartys, Volodymyr A.
N1 - Funding Information:
The authors thank the Norwegian Research Council and Statoil for the financial support. A skilful assistance from the staff of Swiss-Norwegian Beam Lines during the SR XRD experiments is gratefully acknowledged.
Funding Information:
Foundation item: Project “Integrated Process for Hydrogen Production and Separation” supported by Norwegian Research Council and Statoil, Norway Corresponding author: Suwarno SUWARNO; Tel: +47-73594868; E-mail: [email protected] DOI: 10.1016/S1003-6326(11)61394-0
PY - 2012/8
Y1 - 2012/8
N2 - The goal of the present work was to optimize the phase-structural composition and microstructure of binary Ti0.8-0.9V0.2-0.1 alloys with respect to their hydrogen sorption properties. Application of these alloys is for hydrogen absorption from gaseous mixtures containing substantial amounts of carbon monoxide (CO) at high temperatures. Irrespective of alloy composition, both α(HCP) and β(BCC) phases in Ti 0.8-0.9V0.2-0.1 formed single phase FCC hydrides upon hydrogenation in pure H2. An in situ synchrotron X-ray diffraction study showed that only the β-phase transformed to the corresponding hydride when the alloy was hydrogenated in a mixture of H2+10%CO. Rapid solidification (RS) of the alloy resulted in refined grain sizes both in the Ti0.8V0.2 and Ti0.9V0.1 alloys. Furthermore, RS was found to increase the β-phase fraction in Ti 0.9V0.1, being twice larger than that of the as-cast alloy. Ti0.9V0.1 had a platelike microstructure as observed by scanning electron microscopy (SEM), the plates were about 300 nm thick. The microstructure refinement resulted in a faster kinetics of H desorption as observed by temperature desorption spectroscopy (TDS).
AB - The goal of the present work was to optimize the phase-structural composition and microstructure of binary Ti0.8-0.9V0.2-0.1 alloys with respect to their hydrogen sorption properties. Application of these alloys is for hydrogen absorption from gaseous mixtures containing substantial amounts of carbon monoxide (CO) at high temperatures. Irrespective of alloy composition, both α(HCP) and β(BCC) phases in Ti 0.8-0.9V0.2-0.1 formed single phase FCC hydrides upon hydrogenation in pure H2. An in situ synchrotron X-ray diffraction study showed that only the β-phase transformed to the corresponding hydride when the alloy was hydrogenated in a mixture of H2+10%CO. Rapid solidification (RS) of the alloy resulted in refined grain sizes both in the Ti0.8V0.2 and Ti0.9V0.1 alloys. Furthermore, RS was found to increase the β-phase fraction in Ti 0.9V0.1, being twice larger than that of the as-cast alloy. Ti0.9V0.1 had a platelike microstructure as observed by scanning electron microscopy (SEM), the plates were about 300 nm thick. The microstructure refinement resulted in a faster kinetics of H desorption as observed by temperature desorption spectroscopy (TDS).
KW - Carbon monoxide
KW - Hydrogen storage
KW - Rapid solidification
KW - Synchrotron X-ray diffraction
KW - Ti-V alloys
UR - http://www.scopus.com/inward/record.url?scp=84866064367&partnerID=8YFLogxK
U2 - 10.1016/S1003-6326(11)61394-0
DO - 10.1016/S1003-6326(11)61394-0
M3 - Article
AN - SCOPUS:84866064367
SN - 1003-6326
VL - 22
SP - 1831
EP - 1838
JO - Transactions of Nonferrous Metals Society of China (English Edition)
JF - Transactions of Nonferrous Metals Society of China (English Edition)
IS - 8
ER -