Abstract
A (TiAl)Hx hydride which has a tetragonal crystal structure with lattice parameters a = 0.452 nm and c = 0.326 nm (c/a = 0.721) has been observed in Ti42Al, Ti45Al and Ti50Al (at.%) two-phase (Ti3Al (α2) + TiAl (γ)) titanium aluminides by cathodic charging in a 5% H2SO4 solution. Cracks or pits are also observed within the γ phase regions in the two-phase (α2 + γ) coexisting grains (such as lamellar grains) but not within the α2 phase or single γ grains. Weights of the samples decrease with increasing charging time owing to the crack or pit formation, and this is more drastic in the Ti-50Al alloy than in the Ti-42Al and Ti-45Al alloys. The hydride is thermally stable at temperatures up to about 550 K (277 °C) and dissociates completely at temperatures between 673 K (400 °C) and 723 K (450 °C).
| Original language | English |
|---|---|
| Pages (from-to) | 1-6 |
| Number of pages | 6 |
| Journal | Journal of Alloys and Compounds |
| Volume | 216 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1994 |
| Externally published | Yes |
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Keywords
- Cathodic charging
- Hydride formation
- Titanium aluminides
ASJC Scopus subject areas
- Metals and Alloys
Cite this
Hydride formation in two-phase (Ti3Al + TiAl) titanium aluminides during cathodic charging and its dissociation. / Takasaki, Akito; Ojima, Kozo; Taneda, Youji.
In: Journal of Alloys and Compounds, Vol. 216, No. 1, 1994, p. 1-6.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hydride formation in two-phase (Ti3Al + TiAl) titanium aluminides during cathodic charging and its dissociation
AU - Takasaki, Akito
AU - Ojima, Kozo
AU - Taneda, Youji
PY - 1994
Y1 - 1994
N2 - A (TiAl)Hx hydride which has a tetragonal crystal structure with lattice parameters a = 0.452 nm and c = 0.326 nm (c/a = 0.721) has been observed in Ti42Al, Ti45Al and Ti50Al (at.%) two-phase (Ti3Al (α2) + TiAl (γ)) titanium aluminides by cathodic charging in a 5% H2SO4 solution. Cracks or pits are also observed within the γ phase regions in the two-phase (α2 + γ) coexisting grains (such as lamellar grains) but not within the α2 phase or single γ grains. Weights of the samples decrease with increasing charging time owing to the crack or pit formation, and this is more drastic in the Ti-50Al alloy than in the Ti-42Al and Ti-45Al alloys. The hydride is thermally stable at temperatures up to about 550 K (277 °C) and dissociates completely at temperatures between 673 K (400 °C) and 723 K (450 °C).
AB - A (TiAl)Hx hydride which has a tetragonal crystal structure with lattice parameters a = 0.452 nm and c = 0.326 nm (c/a = 0.721) has been observed in Ti42Al, Ti45Al and Ti50Al (at.%) two-phase (Ti3Al (α2) + TiAl (γ)) titanium aluminides by cathodic charging in a 5% H2SO4 solution. Cracks or pits are also observed within the γ phase regions in the two-phase (α2 + γ) coexisting grains (such as lamellar grains) but not within the α2 phase or single γ grains. Weights of the samples decrease with increasing charging time owing to the crack or pit formation, and this is more drastic in the Ti-50Al alloy than in the Ti-42Al and Ti-45Al alloys. The hydride is thermally stable at temperatures up to about 550 K (277 °C) and dissociates completely at temperatures between 673 K (400 °C) and 723 K (450 °C).
KW - Cathodic charging
KW - Hydride formation
KW - Titanium aluminides
UR - http://www.scopus.com/inward/record.url?scp=0028734290&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028734290&partnerID=8YFLogxK
U2 - 10.1016/0925-8388(94)91032-4
DO - 10.1016/0925-8388(94)91032-4
M3 - Article
AN - SCOPUS:0028734290
VL - 216
SP - 1
EP - 6
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - 1
ER -