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@ARTICLE{Yao:838299,
      author       = {Yao, M. J. and Welsch, E. and Ponge, D. and Haghighat, S.
                      M. H. and Sandlöbes, S. and Choi, P. and Herbig, M. and
                      Bleskov, I. and Hickel, T. and Lipinska-Chwalek, M. and
                      Shanthraj, P. and Scheu, C. and Zaefferer, S. and Gault, B.
                      and Raabe, D.},
      title        = {{S}trengthening and strain hardening mechanisms in a
                      precipitation-hardened high-{M}n lightweight steel},
      journal      = {Acta materialia},
      volume       = {140},
      issn         = {1359-6454},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-06942},
      pages        = {258 - 273},
      year         = {2017},
      abstract     = {We report on the strengthening and strain hardening
                      mechanisms in an aged high-Mn lightweight steel
                      (Fe-30.4Mn-8Al-1.2C, $wt.\%)$ studied by electron channeling
                      contrast imaging (ECCI), transmission electron microscopy
                      (TEM), atom probe tomography (APT) and correlative TEM/APT.
                      Upon isothermal annealing at 600 °C, nano-sized κ-carbides
                      form, as characterized by TEM and APT. The resultant alloy
                      exhibits high strength and excellent ductility accompanied
                      by a high constant strain hardening rate.In comparison to
                      the as-quenched κ-free state, the precipitation of
                      κ-carbides leads to a significant increase in yield
                      strength (∼480 MPa) without sacrificing much tensile
                      elongation. To study the strengthening and strain hardening
                      behavior of the precipitation-hardened material, deformation
                      microstructures were analyzed at different strain levels.
                      TEM and correlative TEM/APT results show that the
                      κ-carbides are primarily sheared by lattice dislocations,
                      gliding on the typical face-centered-cubic (fcc) slip system
                      {111}<110>, leading to particle dissolution and solute
                      segregation. Ordering strengthening is the predominant
                      strengthening mechanism. As the deformation substructure is
                      characterized by planar slip bands, we quantitatively
                      studied the evolution of the slip band spacing during
                      straining to understand the strain hardening behavior. A
                      good agreement between the calculated flow stresses and the
                      experimental data suggests that dynamic slip band refinement
                      is the main strain hardening mechanism. The influence of
                      κ-carbides on mechanical properties is discussed by
                      comparing the results with that of the same alloy in the
                      as-quenched, κ-free state.},
      cin          = {ER-C-2},
      ddc          = {670},
      cid          = {I:(DE-Juel1)ER-C-2-20170209},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000413879800027},
      doi          = {10.1016/j.actamat.2017.08.049},
      url          = {https://juser.fz-juelich.de/record/838299},
}