Dislocation pinning effects induced by nano-precipitates during warm laser shock peening

Dislocation dynamic simulation and experiments

Yiliang Liao, Chang Ye, Huang Gao, Bong Joong Kim, Sergey Suslov, Eric A. Stach, Gary J. Cheng

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Warm laser shock peening (WLSP) is a new high strain rate surface strengthening process that has been demonstrated to significantly improve the fatigue performance of metallic components. This improvement is mainly due to the interaction of dislocations with highly dense nanoscale precipitates, which are generated by dynamic precipitation during the WLSP process. In this paper, the dislocation pinning effects induced by the nanoscale precipitates during WLSP are systematically studied. Aluminum alloy 6061 and AISI 4140 steel are selected as the materials with which to conduct WLSP experiments. Multiscale discrete dislocation dynamics (MDDD) simulation is conducted in order to investigate the interaction of dislocations and precipitates during the shock wave propagation. The evolution of dislocation structures during the shock wave propagation is studied. The dislocation structures after WLSP are characterized via transmission electron microscopy and are compared with the results of the MDDD simulation. The results show that nano-precipitates facilitate the generation of highly dense and uniformly distributed dislocation structures. The dislocation pinning effect is strongly affected by the density, size, and space distribution of nano-precipitates.

Original languageEnglish
Article number023518
JournalJournal of Applied Physics
Volume110
Issue number2
DOIs
Publication statusPublished - 15 Jul 2011
Externally publishedYes

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peening
precipitates
shock
lasers
simulation
shock wave propagation
aluminum alloys
strain rate
density distribution
interactions
steels

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Dislocation pinning effects induced by nano-precipitates during warm laser shock peening : Dislocation dynamic simulation and experiments. / Liao, Yiliang; Ye, Chang; Gao, Huang; Kim, Bong Joong; Suslov, Sergey; Stach, Eric A.; Cheng, Gary J.

In: Journal of Applied Physics, Vol. 110, No. 2, 023518, 15.07.2011.

Research output: Contribution to journalArticle

Liao, Yiliang ; Ye, Chang ; Gao, Huang ; Kim, Bong Joong ; Suslov, Sergey ; Stach, Eric A. ; Cheng, Gary J. / Dislocation pinning effects induced by nano-precipitates during warm laser shock peening : Dislocation dynamic simulation and experiments. In: Journal of Applied Physics. 2011 ; Vol. 110, No. 2.
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