| Full text | |
| Author(s): |
de Marco, Marcelo Orpinelli
[1]
;
Li, Yongtao
[2, 3]
;
Li, Hai-Wen
[2, 4, 5]
;
Edalati, Kaveh
[5]
;
Floriano, Ricardo
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Estadual Campinas, UNICAMP, FCA, Rua Pedro Zaccaria 1300, BR-13484350 Limeira, SP - Brazil
[2] Kyushu Univ, Int Res Ctr Hydrogen Energy, Fukuoka, Fukuoka 8190395 - Japan
[3] Anhui Univ Technol, Sch Mat Sci & Engn, Maanshan 243002 - Peoples R China
[4] Kyushu Univ, Platform Inter Transdisciplinary Energy Res Q PIT, Fukuoka, Fukuoka 8190395 - Japan
[5] Kyushu Univ, WPI, I2CNER, Fukuoka, Fukuoka 8190395 - Japan
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | ADVANCED ENGINEERING MATERIALS; v. 22, n. 2 NOV 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
Body-centered cubic (BCC) and high-entropy alloys are being investigated as potential hydrogen storage materials due to their ability to absorb high amounts of hydrogen at moderate temperatures. Herein, the synthesis and hydrogen storage behavior of new MgVCr BCC and MgTiVCrFe high-entropy alloys are studied. The alloys are initially synthesized by mechanical alloying via high-energy ball milling (HEBM) under hydrogen atmosphere followed by high-pressure torsion (HPT) processing to improve activation. X-ray diffraction (XRD) in combination with transmission electron microscopy (TEM) shows a very refined nanostructure in both samples with the presence of a BCC solid solution phase for MgVCr, whereas the crystalline and amorphous phases coexist in MgTiVCrFe. The MgVCr alloy exhibits fast kinetics but with a low reversible hydrogen storage capacity (up to 0.9 wt%), whereas MgTiVCrFe shows low affinity to absorb hydrogen. Moreover, MgTiVCrFe demonstrates a partial decomposition from the initial structure by hydrogen storage cycling, whereas MgVcr exhibits reasonable stability. (AU) | |
| FAPESP's process: | 18/15968-4 - Synthesis and Characterization of High Entropy Alloys based on TiFe System |
| Grantee: | Ricardo Floriano |
| Support Opportunities: | Regular Research Grants |