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<p>Al–Zn–Mg–Cu alloys are widely used in the aerospace and automotive industries due to their exceptional mechanical properties. However, their severe hot tearing susceptibility (HTS) during solidification restricts near-net-shape manufacturing, thereby limiting their broader applications. In this study, the influence of Ni addition on the HTS of Al–6Zn–2.5Mg–1.5Cu–<i>x</i>Ni (<i>x</i> = 0, 0.5, 1, and 1.5&#xa0;wt pct) alloys was investigated using a constrained rod casting (CRC) mold. The results revealed that HTS did not monotonically decrease with increasing Ni content but exhibited an abnormal increase when the Ni content exceeded 1.0&#xa0;wt pct. The experimental results were compared with the predictions from the ProCAST simulation and Kou's criterion. The predictions agreed reasonably well with the experimental HTS when the Ni content was less than 1.0&#xa0;wt pct; however, as the Ni content further increased, the predictions showed a continuous decrease and significantly deviated from the experimental HTS. Further analysis indicated that a narrower vulnerable temperature range, finer grain size, and smaller solidification contraction contributed to lower HTS at low Ni contents. In contrast, the abnormally severe HTS observed in the 1.5&#xa0;wt pct Ni alloy was attributed to the formation of coarse fishbone-like Al<sub>3</sub>Ni, which disrupted the feeding channels and induced cavity formation. The findings are expected to provide valuable insights for preparing high-quality cast Al<b>–</b>Zn<b>–</b>Mg<b>–</b>Cu alloys, advancing their production and application.</p>

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Effect of Ni Addition on the Hot Tearing Susceptibility of Al–Zn–Mg–Cu Alloys

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Yixiong Lin,
  • Liandeng Wang,
  • Bin Geng,
  • Zhiwei Jiang

摘要

Al–Zn–Mg–Cu alloys are widely used in the aerospace and automotive industries due to their exceptional mechanical properties. However, their severe hot tearing susceptibility (HTS) during solidification restricts near-net-shape manufacturing, thereby limiting their broader applications. In this study, the influence of Ni addition on the HTS of Al–6Zn–2.5Mg–1.5Cu–xNi (x = 0, 0.5, 1, and 1.5 wt pct) alloys was investigated using a constrained rod casting (CRC) mold. The results revealed that HTS did not monotonically decrease with increasing Ni content but exhibited an abnormal increase when the Ni content exceeded 1.0 wt pct. The experimental results were compared with the predictions from the ProCAST simulation and Kou's criterion. The predictions agreed reasonably well with the experimental HTS when the Ni content was less than 1.0 wt pct; however, as the Ni content further increased, the predictions showed a continuous decrease and significantly deviated from the experimental HTS. Further analysis indicated that a narrower vulnerable temperature range, finer grain size, and smaller solidification contraction contributed to lower HTS at low Ni contents. In contrast, the abnormally severe HTS observed in the 1.5 wt pct Ni alloy was attributed to the formation of coarse fishbone-like Al3Ni, which disrupted the feeding channels and induced cavity formation. The findings are expected to provide valuable insights for preparing high-quality cast Al–Zn–Mg–Cu alloys, advancing their production and application.