Effect of grain boundary dislocations on the sliding resistance of {Sigma}11 grain boundaries in aluminum
Journal Article
·
· Scripta Materialia
- Pacific Northwest National Lab., Richland, WA (United States)
- Washington State Univ., Pullman, WA (United States)
Grain boundary (GB) sliding, which involves the relative translation of two adjacent grains by a shear parallel to the boundary plane, is an important mode of deformation in elevated temperature processes such as creep and superplasticity. It is generally accepted that GB sliding occurs by the motion of dislocations rather than the simultaneous shear of the entire boundary. Only limited information has been obtained on the atomic-scale mechanisms by which GB sliding occurs and, in particular, about accommodation mechanisms. High resolution transmission electron microscopy has been able to provide some details on GB structure, but little information on the dynamic processes of GB sliding. This problem is ideal for study via molecular dynamics simulation techniques since atomic-scale processes can be conveniently modeled. Computer simulations were performed to examine the role of GB dislocations in the sliding of tilt boundaries in aluminum. The sliding resistance of nondislocated GBs was determined from a computation of the dependence of the boundary energy on in-plane translation of one grain relative to the other. Low-energy, faulted structures were found that correspond to unstable intermediate states and the presence of stable partial GB dislocations. Extrinsic GB dislocations lowered the sliding stress relative to the nondislocated GBs.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 651161
- Report Number(s):
- CONF-980202--
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 4-5 Vol. 39; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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