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<p>In this work, an Al-Zn eutectoid damping alloy with a nominal composition of 50Al-489Zn-1Ti-01Ce (at%, atomic percentages) was prepared by hot extrusion following the homogenization, and the effects of extrusion temperature and speed on the microstructures, damping and mechanical properties of the Al-Zn eutectoid damping alloy were systematically investigated. The results show that the as-extruded alloy primarily comprises two types of eutectoid structures with different micro/nanoscales (i.e., eutectoid structures I and II). Moreover, the precipitation of nanoscale η-Zn<sub>II</sub> particles occurs in the Al matrix phase of eutectoid structure I. The tensile strength of the Al-Zn eutectoid damping alloy shows an overall increasing trend with an increase in extrusion temperature. As the temperature increases and the extrusion speed decreases, the damping performance of the alloy decreases. In particular, the as-extruded alloy at 648&#xa0;K–1&#xa0;mm/s exhibits a high tensile strength of up to 390&#xa0;MPa while still maintaining relatively good damping properties (when the strain amplitude is 8 × 10<sup>−&#xa0;4</sup>, the value of tan δ is 0029). The high area percentage of fine lamellar eutectoid structure II and the nearly network-like structure consisting of these two alternating eutectoid structures contribute significantly to the increase in the tensile strength of the as-extruded alloy at 648&#xa0;K–1&#xa0;mm/s.</p>

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Microstructure and Properties of an Al-Zn Eutectoid Damping Alloy Prepared by Hot Extrusion

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Shuyi Wang,
  • Song Zhang,
  • Wan Ting Sow,
  • Yonggang Xu

摘要

In this work, an Al-Zn eutectoid damping alloy with a nominal composition of 50Al-489Zn-1Ti-01Ce (at%, atomic percentages) was prepared by hot extrusion following the homogenization, and the effects of extrusion temperature and speed on the microstructures, damping and mechanical properties of the Al-Zn eutectoid damping alloy were systematically investigated. The results show that the as-extruded alloy primarily comprises two types of eutectoid structures with different micro/nanoscales (i.e., eutectoid structures I and II). Moreover, the precipitation of nanoscale η-ZnII particles occurs in the Al matrix phase of eutectoid structure I. The tensile strength of the Al-Zn eutectoid damping alloy shows an overall increasing trend with an increase in extrusion temperature. As the temperature increases and the extrusion speed decreases, the damping performance of the alloy decreases. In particular, the as-extruded alloy at 648 K–1 mm/s exhibits a high tensile strength of up to 390 MPa while still maintaining relatively good damping properties (when the strain amplitude is 8 × 10− 4, the value of tan δ is 0029). The high area percentage of fine lamellar eutectoid structure II and the nearly network-like structure consisting of these two alternating eutectoid structures contribute significantly to the increase in the tensile strength of the as-extruded alloy at 648 K–1 mm/s.