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<p>To investigate the effect of Zr on heat-resistant phases, Al-12Si-4Cu-1.7Ni-0.75&#xa0;Mg-<i>x</i>Zr alloys with varying Zr contents (<i>x</i> = 0, 0.05, 0.10, 0.15, and 0.20 wt.%) were prepared. The microstructure and mechanical properties of the alloys at 25, 200, and 350&#xa0;°C were analyzed using XRD, SEM, TEM, and tensile testing. The results suggested that as the Zr content increased, the grain size of the alloys gradually decreased, while the sizes of primary Si and secondary phase particles initially decreased and then increased. However, with increasing Zr content, the amount of Cu-Ni phases gradually decreased, while the amount of the Al<sub>9</sub>FeNi gradually increased. At 25 and 200 °C, the 0.10-Zr alloy exhibited the highest ultimate tensile strength, primary due to the finest secondary phases and primary Si particles. At 350 °C, the 0.20-Zr alloy showed the highest ultimate tensile strength of 99.3&#xa0;MPa, mainly attributed to the highest content of Al<sub>9</sub>FeNi phase particles.</p>

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Evolution and Strengthening Effects of Heat-Resistant Phases in Al-Si-Cu-Ni Piston Alloys with Minor Zr Additions

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Fei Liu,
  • Juntao Zhang,
  • Xiao Han,
  • Pucun Bai,
  • Shiying Liu,
  • Zengjian Feng,
  • Peiyou Xiong,
  • Jun Wang

摘要

To investigate the effect of Zr on heat-resistant phases, Al-12Si-4Cu-1.7Ni-0.75 Mg-xZr alloys with varying Zr contents (x = 0, 0.05, 0.10, 0.15, and 0.20 wt.%) were prepared. The microstructure and mechanical properties of the alloys at 25, 200, and 350 °C were analyzed using XRD, SEM, TEM, and tensile testing. The results suggested that as the Zr content increased, the grain size of the alloys gradually decreased, while the sizes of primary Si and secondary phase particles initially decreased and then increased. However, with increasing Zr content, the amount of Cu-Ni phases gradually decreased, while the amount of the Al9FeNi gradually increased. At 25 and 200 °C, the 0.10-Zr alloy exhibited the highest ultimate tensile strength, primary due to the finest secondary phases and primary Si particles. At 350 °C, the 0.20-Zr alloy showed the highest ultimate tensile strength of 99.3 MPa, mainly attributed to the highest content of Al9FeNi phase particles.