Hostname: page-component-78c5997874-mlc7c Total loading time: 0 Render date: 2024-11-18T01:17:13.864Z Has data issue: false hasContentIssue false
  • English
  • Français

Hydrogen-enhanced dislocation velocities in Ni3Al single crystals

Published online by Cambridge University Press:  31 January 2011

C. B. Jiang ,
S. Patu ,
Q. Z. Lei  and
C. X. Shi
C. B. Jiang
Affiliation:
State Key Laboratory for Fatigue and Fracture of Materials, Institute of Metal Research, Chinese Academy of Science, Wenhua Road 72, Shenyang 110015, eople's Republic of China
S. Patu
Affiliation:
State Key Laboratory for Fatigue and Fracture of Materials, Institute of Metal Research, Chinese Academy of Science, Wenhua Road 72, Shenyang 110015, eople's Republic of China
Q. Z. Lei
Affiliation:
State Key Laboratory for Fatigue and Fracture of Materials, Institute of Metal Research, Chinese Academy of Science, Wenhua Road 72, Shenyang 110015, eople's Republic of China
C. X. Shi
Affiliation:
State Key Laboratory for Fatigue and Fracture of Materials, Institute of Metal Research, Chinese Academy of Science, Wenhua Road 72, Shenyang 110015, eople's Republic of China
Get access

Extract

The average dislocation velocity in hydrogenated Ni3Al single crystals was directly measured as a function of resolved shear stress (RSS) at room temperature (293 K) by the etch-pit technique. It was found that the dislocation velocity with hydrogen is about 5–25 times faster than that without hydrogen for the same RSS, and hydrogen decreases activation energy for dislocation motion in Ni3Al single crystals. The reason hydrogen can enhance dislocation velocity in this compound is briefly discussed. These preliminary results quantitatively provide the first evidence of hydrogen-enhancing dislocation mobility in Ni3Al material.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 1 , January 2000 , pp. 7 - 9
Copyright
Copyright © Materials Research Society 2000

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Hirth, J.P., Metall. Trans. 11A, 861 (1980).CrossRefGoogle Scholar
2.Birnbaum, H.K. and Sofronis, P., Mater. Sci. Eng. A176, 191 (1994).CrossRefGoogle Scholar
3.George, E.P. and Liu, C.T., in High-Temperature Ordered Intermetallic Alloys VI, edited by Horton, J., Hanada, S., Baker, I., Noebe, R.D., and Schwartz, D. (Mater. Res. Soc. Proc. 364, Pittsburgh, PA, 1995), p. 1131.Google Scholar
4.Ferreira, P.J., Robertson, I.M., and Birnbaum, H.K., Acta Metall. Mater. 46, 1749 (1998).CrossRefGoogle Scholar
5.Ferreira, P.J., Birnbaum, H.K., and Robertson, I.M., Mater. Sci. Forum. 1, 207 (1996).Google Scholar
6.Huaxin, Li and Chaki, T.K., Acta Metall. 41, 1979 (1993).Google Scholar
7.Sirois, E. and Birnbaum, H.K., Acta Metall. 40, 1377 (1992).CrossRefGoogle Scholar
8.Sofronis, P. and Birnbaum, H.K., J. Mech. Phys. Solids. 43, 49 (1995).CrossRefGoogle Scholar
9.Madgorny, E.M., Dislocation Dynamics and Mechanical Properties of Crystals, Progress in Materials Sciences Series (Pergamon, Oxford, United Kingdom, 1998), and references therein.Google Scholar
10.Jiang, C.B., Patu, S., Lei, Q.Z., and Shi, C.X., Philos. Mag. Lett. 78, 1 (1998).CrossRefGoogle Scholar
11.Kear, B.H. and Wilsdorf, H.G.F, Trans. AIME 224, 382 (1962).Google Scholar
12.Paidar, V., Pope, D.P., and Vitek, V., Acta Metall. 32, 435 (1984).CrossRefGoogle Scholar
13.Couret, A. and Caillard, D., J. Phys. III 1, 885 (1991).Google Scholar
14.Hirsch, P.B., Philos. Mag. A65, 559 (1992).Google Scholar