Scale law of complex deformation transitions of nanotwins in stainless steel

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • A.Y. Chen
  • L.L. Zhu
  • L.G. Sun
  • J.B. Liu
  • H.T. Wang
  • X.Y. Wang
  • J.H. Yang

Detail(s)

Original languageEnglish
Article number1403
Journal / PublicationNature Communications
Volume10
Online published29 Mar 2019
Publication statusPublished - 2019

Link(s)

Abstract

Understanding the deformation behavior of metallic materials containing nanotwins (NTs), which can enhance both strength and ductility, is useful for tailoring microstructures at the micro- and nano- scale to enhance mechanical properties. Here, we construct a clear deformation pattern of NTs in austenitic stainless steel by combining in situ tensile tests with a dislocation-based theoretical model and molecular dynamics simulations. Deformation NTs are observed in situ using a transmission electron microscope in different sample regions containing NTs with twin-lamella-spacing (λ) varying from a few nanometers to hundreds of nanometers. Two deformation transitions are found experimentally: from coactivated twinning/detwinning (λ < 5 nm) to secondary twinning (5 nm < λ < 129 nm), and then to the dislocation glide (λ > 129 nm). The simulation results are highly consistent with the observed strong λ-effect, and reveal the intrinsic transition mechanisms induced by partial dislocation slip.

Research Area(s)

Citation Format(s)

Scale law of complex deformation transitions of nanotwins in stainless steel. / Chen, A.Y.; Zhu, L.L.; Sun, L.G.; Liu, J.B.; Wang, H.T.; Wang, X.Y.; Yang, J.H.; Lu, J.

In: Nature Communications, Vol. 10, 1403, 2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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