Cryogenic ultrahigh strain rate deformation induced hybrid nanotwinned microstructure for high strength and high ductility

Chang Ye, Sergey Suslov, Dong Lin, Yiliang Liao, Gary J. Cheng

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Nanocrystalline metallic materials prepared by severe plastic deformation often possess high strength but low ductility due to the low dislocation accumulation capacity of the nanograins. Here, we report a unique process, namely, cryogenic laser shock peening (CLSP), to generate gradient nanotwinned microstructure that leads to high strength while preserving the ductility. It was observed that gradient structure was generated in copper. Near the top surface, nanocrystalline with high dense nanotwins have been observed; with the depth increasing, the fraction of the twin boundaries reduces and more heavily dislocated subgrains are observed. It has been demonstrated that CLSP can significantly improve material strength while preserving the ductility. The mechanism of the formation of gradient microstructure and high dense nanotwins near the surface was discussed. The reason behind the improvement in strength and ductility was investigated.

Original languageEnglish
Article number213519
JournalJournal of Applied Physics
Volume115
Issue number21
DOIs
Publication statusPublished - 7 Jun 2014
Externally publishedYes

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high strength
ductility
strain rate
cryogenics
peening
microstructure
gradients
preserving
shock
plastic deformation
lasers
mechanical properties
copper

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Cryogenic ultrahigh strain rate deformation induced hybrid nanotwinned microstructure for high strength and high ductility. / Ye, Chang; Suslov, Sergey; Lin, Dong; Liao, Yiliang; Cheng, Gary J.

In: Journal of Applied Physics, Vol. 115, No. 21, 213519, 07.06.2014.

Research output: Contribution to journalArticle

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