Abstract
Quenching and annealing experiments with electrical resistivity measurements were applied to magnesium to investigate the formation of thermal vacancies. Two specimens made from materials differing in impurity contents were examined. One of the specimens quenched in a methanol bath at -80°C from elevated temperatures ranging from 160°C to 500°C revealed a significant decrease in electrical resistance after annealing for 10 min in the bath. Based on the annealing behaviors at low temperatures (-100°C to -60°C) after the quenching from 200°C, this decrease is thought to be due to the presence of hydrogen in solution. The other specimen, presumably containing smaller amounts of hydrogen, was quenched in iced water from elevated temperatures (200°C-560°C) which yielded results characterized by two thermal activation processes. These processes had the activation energies 54.1 kJ/mol (0.56 eV) and 89.8kJ/mol (0.93 eV) for the lower and higher quenching temperature ranges, respectively. The former is ascribed to the formation energy of a vacancy interacting with hydrogen and the latter to the intrinsic formation energy of a vacancy. The difference between these energies, 35.7kJ/mol (0.37 eV). is the binding energy between a vacancy and a hydrogen atom.
| Original language | English |
|---|---|
| Pages (from-to) | 2006-2011 |
| Number of pages | 6 |
| Journal | Materials Transactions |
| Volume | 49 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 2008 |
Fingerprint
Keywords
- Binding energy
- Diffusion
- Electrical resistance
- Formation energy
- Hydrogen
- Magnesium
- Quenching
- Vacancy
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
- Mechanics of Materials
Cite this
Effects of hydrogen on the vacancy formation in magnesium. / Yamada, Masuo; Hida, Moritaka; Senuma, Takehide.
In: Materials Transactions, Vol. 49, No. 9, 09.2008, p. 2006-2011.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of hydrogen on the vacancy formation in magnesium
AU - Yamada, Masuo
AU - Hida, Moritaka
AU - Senuma, Takehide
PY - 2008/9
Y1 - 2008/9
N2 - Quenching and annealing experiments with electrical resistivity measurements were applied to magnesium to investigate the formation of thermal vacancies. Two specimens made from materials differing in impurity contents were examined. One of the specimens quenched in a methanol bath at -80°C from elevated temperatures ranging from 160°C to 500°C revealed a significant decrease in electrical resistance after annealing for 10 min in the bath. Based on the annealing behaviors at low temperatures (-100°C to -60°C) after the quenching from 200°C, this decrease is thought to be due to the presence of hydrogen in solution. The other specimen, presumably containing smaller amounts of hydrogen, was quenched in iced water from elevated temperatures (200°C-560°C) which yielded results characterized by two thermal activation processes. These processes had the activation energies 54.1 kJ/mol (0.56 eV) and 89.8kJ/mol (0.93 eV) for the lower and higher quenching temperature ranges, respectively. The former is ascribed to the formation energy of a vacancy interacting with hydrogen and the latter to the intrinsic formation energy of a vacancy. The difference between these energies, 35.7kJ/mol (0.37 eV). is the binding energy between a vacancy and a hydrogen atom.
AB - Quenching and annealing experiments with electrical resistivity measurements were applied to magnesium to investigate the formation of thermal vacancies. Two specimens made from materials differing in impurity contents were examined. One of the specimens quenched in a methanol bath at -80°C from elevated temperatures ranging from 160°C to 500°C revealed a significant decrease in electrical resistance after annealing for 10 min in the bath. Based on the annealing behaviors at low temperatures (-100°C to -60°C) after the quenching from 200°C, this decrease is thought to be due to the presence of hydrogen in solution. The other specimen, presumably containing smaller amounts of hydrogen, was quenched in iced water from elevated temperatures (200°C-560°C) which yielded results characterized by two thermal activation processes. These processes had the activation energies 54.1 kJ/mol (0.56 eV) and 89.8kJ/mol (0.93 eV) for the lower and higher quenching temperature ranges, respectively. The former is ascribed to the formation energy of a vacancy interacting with hydrogen and the latter to the intrinsic formation energy of a vacancy. The difference between these energies, 35.7kJ/mol (0.37 eV). is the binding energy between a vacancy and a hydrogen atom.
KW - Binding energy
KW - Diffusion
KW - Electrical resistance
KW - Formation energy
KW - Hydrogen
KW - Magnesium
KW - Quenching
KW - Vacancy
UR - http://www.scopus.com/inward/record.url?scp=54549110137&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=54549110137&partnerID=8YFLogxK
U2 - 10.2320/matertrans.MRA2008082
DO - 10.2320/matertrans.MRA2008082
M3 - Article
VL - 49
SP - 2006
EP - 2011
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 9
ER -