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Dislocations emission and crack extension at the atomistic crack tip in body-centered-cubic metal Mo

Published online by Cambridge University Press:  31 January 2011

Qiheng Tang  and
Tzuchiang Wang
Qiheng Tang
Affiliation:
LNM Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Tzuchiang Wang
Affiliation:
LNM Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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Abstract

The behaviors of a crack in body-centered-cubic metal Mo under different loading modes were studied using the molecular dynamics method. Dislocation emission was observed near the crack tip in response to mode II loading with θ = 0° in which θ is the inclination angle of the slip plane with respect to the crack plane, and two full dislocations were observed at the stress level of KII = 1.17 MPa m1/2 without any evidence of crack extension. Within the range of 0° ≤ θ ≤ 45°, crack extension was observed in response to mode I loading, and the effect of crystal orientation on the crack propagation was studied. The crack propagated along the [111] slip direction without any evidence of dislocations emission.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 10 , October 1999 , pp. 4035 - 4043
Copyright
Copyright © Materials Research Society 1999

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