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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
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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.

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

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References

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