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<p>Heterostructured materials are becoming as a major material research issue due to its superior combination of strength and ductility, which overcoming the conventional strength-ductility trade-off dilemma. In the present study, a heterostructured H62 brass was fabricated by cold rolling and subsequent short-time annealing, and tensile results revealed that the H62-1.81–400 °C + 10&#xa0;min specimen presented a higher yield of 245.6&#xa0;MPa and a uniform elongation of 38.9%, which achieved the strength-ductility synergy. Microstructural characterization demonstrated that partial recrystallization was generated during annealing, and the structure was composed of nanograins, ultrafine grains and coarse grains. The increased yield strength can be attributed to the second phase strengthening, grain boundary strengthening, dislocation strengthening and HDI strengthening mechanism, and the excellent ductility can be attributed to the relatively lower retained dislocation density after partial annealing and HDI strain hardening. Moreover, the HDI strengthening and HDI strain hardening played a key role for improving yield strength and sustain superior ductility during tensile deformation. The present study provides a method for achieving good combination of strength and ductility by a feasible rolling and heat treatment processing.</p>

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Superior strength-ductility combination of H62 brass with heterogeneous microstructure via rolling and annealing

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Lele Sun,
  • Yulan Gong,
  • Shuwei Quan,
  • Shen Qin,
  • Xinkun Zhu,
  • Xingfu Li

摘要

Heterostructured materials are becoming as a major material research issue due to its superior combination of strength and ductility, which overcoming the conventional strength-ductility trade-off dilemma. In the present study, a heterostructured H62 brass was fabricated by cold rolling and subsequent short-time annealing, and tensile results revealed that the H62-1.81–400 °C + 10 min specimen presented a higher yield of 245.6 MPa and a uniform elongation of 38.9%, which achieved the strength-ductility synergy. Microstructural characterization demonstrated that partial recrystallization was generated during annealing, and the structure was composed of nanograins, ultrafine grains and coarse grains. The increased yield strength can be attributed to the second phase strengthening, grain boundary strengthening, dislocation strengthening and HDI strengthening mechanism, and the excellent ductility can be attributed to the relatively lower retained dislocation density after partial annealing and HDI strain hardening. Moreover, the HDI strengthening and HDI strain hardening played a key role for improving yield strength and sustain superior ductility during tensile deformation. The present study provides a method for achieving good combination of strength and ductility by a feasible rolling and heat treatment processing.