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<p>This study investigates the influence of Zr addition on the microstructural evolution and mechanical properties of Cu-3Ti alloys. After peak aging at 450&#xa0;°C for 1&#xa0;h, the Cu-3Ti alloy exhibited a tensile strength of 936&#xa0;MPa and an elongation of 7.5%, whereas the Cu-3Ti-0.3Zr alloy achieved 987&#xa0;MPa and 12.5%, respectively. The softening temperature increased from approximately 490&#xa0;°C for the Cu-3Ti alloy to approximately 520&#xa0;°C for the Cu-3Ti-0.3Zr alloy. The Cu<sub>4</sub>Ti phase precipitated in both alloys during aging, and the Cu<sub>5</sub>Zr and Cu<sub>8</sub>Zr<sub>3</sub> phases precipitated in the Cu-3Ti-0.3Zr alloy. Computational analysis of the strengthening mechanisms in Cu-3Ti and Cu-3Ti-0.3Zr alloys revealed that precipitation strengthening is the primary contributor to alloy strength. The precipitation kinetic equations for both alloys were established, yielding an activation energy of 70&#xa0;kJ/mol for the Cu-3Ti-0.3Zr alloy and demonstrating that the addition of Zr reduces the diffusion rate of solute atoms in the Cu-3Ti alloy.</p>

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Effect of Zr Element Addition on the Microstructure and Properties of Cu-3Ti Alloy

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Yanfang Ma,
  • Xiaowen Peng,
  • Bin Yang,
  • Yanmin Zhang,
  • Yunxiao Hua,
  • Haitao Liu,
  • Tao Huang,
  • Kexing Song

摘要

This study investigates the influence of Zr addition on the microstructural evolution and mechanical properties of Cu-3Ti alloys. After peak aging at 450 °C for 1 h, the Cu-3Ti alloy exhibited a tensile strength of 936 MPa and an elongation of 7.5%, whereas the Cu-3Ti-0.3Zr alloy achieved 987 MPa and 12.5%, respectively. The softening temperature increased from approximately 490 °C for the Cu-3Ti alloy to approximately 520 °C for the Cu-3Ti-0.3Zr alloy. The Cu4Ti phase precipitated in both alloys during aging, and the Cu5Zr and Cu8Zr3 phases precipitated in the Cu-3Ti-0.3Zr alloy. Computational analysis of the strengthening mechanisms in Cu-3Ti and Cu-3Ti-0.3Zr alloys revealed that precipitation strengthening is the primary contributor to alloy strength. The precipitation kinetic equations for both alloys were established, yielding an activation energy of 70 kJ/mol for the Cu-3Ti-0.3Zr alloy and demonstrating that the addition of Zr reduces the diffusion rate of solute atoms in the Cu-3Ti alloy.