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<p>Direct-chill (DC) casting aluminum alloy ingots exhibit microstructures characterized by excessive dendrite development, coarse primary phases, and non-uniform grain distributions, adversely affecting subsequent deformation processing and significantly impairing formability. In the present study, 6005A alloys were prepared using DC and low-frequency electromagnetic castings (LFEC). The results show that the LFEC process continuously affects the microstructure and properties of the two-stage deformed 6005A alloy after heat treatment. Compared with the DC-cast 6005A (6N) alloy, the higher yield strength of the LFEC-cast 6005A (6E) alloy was mainly attributed to precipitation strengthening mechanisms. Furthermore, the 6E alloy exhibited excellent bending performance, with a maximum bending displacement (MBD) of 15.3 ± 0.4&#xa0;mm and maximum bending load (MBL) of 1.4 ± 0.1 kN. The coarse second-phase particles in the 6N alloy induced a pronounced particle-stimulated nucleation (PSN) effect, forming larger grain sizes and Cube textures. Conversely, the fine second-phase particles in the 6E alloy inhibited recrystallization and promoted the development of smaller grain sizes and weaker <i>η</i> fiber textures. Fine second-phase particles and a small grain size led to a higher geometrically necessary dislocation (GND) density and MBD. The small grain size and elevated Schmid factor (SF) values of the textures in the 6E alloy facilitated sliding deformation during hot bending, resulting in significant grain lattice rotation and superior bendability.</p>

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Study on microstructure regulation and hot bending deformation behavior of 6005A alloy fabricated by low-frequency electromagnetic casting

  • 期刊论文

  • 发表日期：

    2025年10月19日

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  • Lingfei Yang,
  • Fang Yu,
  • Chengcheng Chen,
  • Zhaoxi Song,
  • Yajun Xu,
  • Changke Chen,
  • Dongfu Song,
  • Guozhong He,
  • Jianzhong Cui,
  • Xiangjie Wang

摘要

Direct-chill (DC) casting aluminum alloy ingots exhibit microstructures characterized by excessive dendrite development, coarse primary phases, and non-uniform grain distributions, adversely affecting subsequent deformation processing and significantly impairing formability. In the present study, 6005A alloys were prepared using DC and low-frequency electromagnetic castings (LFEC). The results show that the LFEC process continuously affects the microstructure and properties of the two-stage deformed 6005A alloy after heat treatment. Compared with the DC-cast 6005A (6N) alloy, the higher yield strength of the LFEC-cast 6005A (6E) alloy was mainly attributed to precipitation strengthening mechanisms. Furthermore, the 6E alloy exhibited excellent bending performance, with a maximum bending displacement (MBD) of 15.3 ± 0.4 mm and maximum bending load (MBL) of 1.4 ± 0.1 kN. The coarse second-phase particles in the 6N alloy induced a pronounced particle-stimulated nucleation (PSN) effect, forming larger grain sizes and Cube textures. Conversely, the fine second-phase particles in the 6E alloy inhibited recrystallization and promoted the development of smaller grain sizes and weaker η fiber textures. Fine second-phase particles and a small grain size led to a higher geometrically necessary dislocation (GND) density and MBD. The small grain size and elevated Schmid factor (SF) values of the textures in the 6E alloy facilitated sliding deformation during hot bending, resulting in significant grain lattice rotation and superior bendability.