Columnar Grain-driven Plasticity and Cracking in Nanotwinned FCC Metals

Sansoz, Frederic; Fang, Qiongjiali

doi:10.1016/j.actamat.2021.116925

Title: Columnar Grain-driven Plasticity and Cracking in Nanotwinned FCC Metals

Journal Article · Sat Apr 24 00:00:00 EDT 2021 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2021.116925· OSTI ID:1778962

^[1]; Fang, Qiongjiali ^[1]

Univ. of Vermont, Burlington, VT (United States)

The mechanisms of strengthening and plasticity in columnar-grained metals with preferentially oriented nano-sized twins have been examined traditionally by considering dislocation processes, but rarely from the perspective of grain boundary (GB) deformation. Here, the effects of GB strain accommodation on plastic deformation in four different columnar-grained nanocrystalline nanotwinned (nt) face-centered-cubic metals (Cu, Ag, Al, and Ni) were studied by large-scale molecular dynamics simulations. It is observed that in tensile deformation parallel to coherent twin boundaries (CTBs), the dislocation mechanisms in each metal are identical and associated with GB emissions of jog and threading dislocations at small and large CTB spacings, respectively. However, CTB strengthening effects are increasingly more pronounced in columnar-grained nt metals as their shear modulus increases, which is rationalized by the dependence of GB stress concentrations on twin size, metal type and strain rate. Also, while flow stresses in nt-Cu, nt-Ag, and nt-Al metals increase linearly with decreasing CTB spacing, a maximum strength limit is reached in nt-Ni below a critical CTB spacing of 6 nm. The strength limit in nt-Ni results from columnar GB cracking induced by prominent GB sliding. For columnar-grained microstructures, GB sliding is equivalent in nt-Ag and nt-Al and slightly lower in nt-Cu but markedly higher in nt-Ni. These findings underscore the importance of new GB deformation mechanisms on plasticity and fracture in columnar-grained nt metals and enrich our understanding of CTB strengthening in fcc metals synthesized in the literature.

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Research Organization:: Univ. of Vermont, Burlington, VT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); USDOE

Grant/Contract Number:: SC0020054; DMR-1410646; ACI-1548562

OSTI ID:: 1778962

Alternate ID(s):: OSTI ID: 1782339

Journal Information:: Acta Materialia, Vol. 212; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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