| Fracture mechanism of TiAl intermetallics caused by hydride and atomic hydrogen |
| |
| 作者姓名： | 高克玮 王燕斌 林志 乔利杰 褚武扬 |
| |
| 作者单位： | Department of Materials Physics，University of Science and Technology Beijing，Department of Materials Physics，University of Science and Technology Beijing，Department of Materials Physics，University of Science and Technology Beijing，Department of Materials Physics，University of Science and Technology Beijing，Department of Materials Physics，University of Science and Technology Beijing Beijing 100083，China，Beijing 100083，China，Beijing 100083，China，Beijing 100083，China，Beijing 100083，China |
| |
| 摘 要： | Hydrogen embrittlement (HE) of TiAl intermetallics was studied at room temperature. The results showed that there were two forms of HE in TiAl intermetallics, i.e. hydride HE and atomic HE. Most of hydrogen in TiAl intermetallics was transformed into hydrides at room temperature. The hydride exists as (TiAl)H_x for a low hydrogen concentration while it exists in several forms for a higher hydrogen concentration. Stress intensity factor K_(IC) decreased with increase in hydride concentration. K_(IC) decreased further when TiAl intermetallics were charged cathodically with hydrogen in 1 mol/L H_2SO_4 solution. Stress intensity factor during hydrogen charging K_(IH) was about 50％ K_(IC). 20％ of the decrease was caused by hydrides while 30％ was caused by atomic hydrogen. Mechanism of HE caused hydrides was the same as any other second phase in nature. Delayed fracture caused by atomic hydrogen resulted from hydrogen induced local plastic deformation.
|
| 收稿时间： | 19 June 2008 |
Fracture mechanism of TiAl intermetallics caused by hydride and atomic hydrogen |
| |
| Kewei Gao,Yanbin Wang,Zhi Lin,Lijie Qiao,Wuyang Chu.Fracture mechanism of TiAl intermetallics caused by hydride and atomic hydrogen[J].Science in China(Technological Sciences),1999,42(5):511-520. |
| |
| Authors: | Kewei Gao Yanbin Wang Zhi Lin Lijie Qiao Wuyang Chu |
| |
| Affiliation: | (1) Department of Materials Physics, University of Science and Technology Beijing, 100083 Beijing, China |
| |
| Abstract: | Hydrogen embrittlement (HE) of TiAl intermetallics was studied at room temperature. The results showed that there were two forms of HE in TiAl intermetallics, i. e. hydride HE and atomic HE. Most of hydrogen in TiAl intermetallics was transformed into hydrides at room temperature. The hydride exists as (TiAl)Hx for a low hydrogen concentration while it exists in several forms for a higher hydrogen concentration. Stress intensity factor KIC decreased with increase in hydride concentration. KIC decreased further when TiAl intermetallics were charged cathodically with hydrogen in 1 mol/L H2S04 solution. Stress intensity factor during hydrogen charging KIH was about 50% KIC 20% of the decrease was caused by hydrides while 30% was caused by atomic hydrogen. Mechanism of HE caused hydrides was the same as any other second phase in nature. Delayed fracture caused by atomic hydrogen resulted from hydrogen induced local plastic deformation. |
| |
| Keywords: | TiAl intermetallics hydrides hydrogen embrittlement |
| 本文献已被 CNKI SpringerLink 等数据库收录！ |
