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<p>A high-carbon-steel/Cu nanolamellar composite was fabricated via accumulative roll bonding and wire drawing. Cu layers inhibited martensite grain growth during hot-press and hot-rolling, yielding ~ 70-nm-thick steel layers containing single-variant nanotwins (~ 3.5&#xa0;nm thick). The in situ XRD analysis revealed the deformation mechanism of the martensite, characterized by dynamic evolution of its tetragonality (c/a ratio) under uniaxial tensile strain. The nanolamellar/nanotwinned martensite obtained a maximum lattice strain of 2.0%, corresponding to 1400&#xa0;MPa tensile strength of the composite. Ultrahigh strength in martensite is achieved through a high aspect ratio, nanoscale confinement, and Cu-layer crack suppression. Nanolamellar confinement with nanotwinning is a promising strengthening pathway.</p>

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Strong nanolamellar/nanotwinned martensite revealed by in situ synchrotron X-ray diffraction

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Yadong Ru,
  • Fangmin Guo,
  • Yang Ren,
  • Zhaoshun Gao,
  • Lishan Cui

摘要

A high-carbon-steel/Cu nanolamellar composite was fabricated via accumulative roll bonding and wire drawing. Cu layers inhibited martensite grain growth during hot-press and hot-rolling, yielding ~ 70-nm-thick steel layers containing single-variant nanotwins (~ 3.5 nm thick). The in situ XRD analysis revealed the deformation mechanism of the martensite, characterized by dynamic evolution of its tetragonality (c/a ratio) under uniaxial tensile strain. The nanolamellar/nanotwinned martensite obtained a maximum lattice strain of 2.0%, corresponding to 1400 MPa tensile strength of the composite. Ultrahigh strength in martensite is achieved through a high aspect ratio, nanoscale confinement, and Cu-layer crack suppression. Nanolamellar confinement with nanotwinning is a promising strengthening pathway.