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<p>Cu-1.0Cr-0.25Zr-0.3Mg alloys were fabricated by vacuum induction melting, cast in a copper mold and subjected to multi-step deformation-aging treatment. Through the synergistic effect of precipitates and dislocations, we successfully achieved high conductivity of 98.7% IACS, high hardness of 192.2 HB and high strength of 559.7&#xa0;MPa in Cu-1.0Cr-0.25Zr-0.3Mg alloy. Different from the traditional treatment, this study adopts a new multi-step deformation-aging treatment, which can effectively improve the decrease in conductivity caused by deformation, strengthen the contribution of dislocations and precipitates, and achieve dual-phase strengthening. Compared with single-step deformation-aging, the properties are greatly improved and the plasticity is restored. After single-step treatment, two types of nano-precipitates appear in the alloy, which are semi-coherent ellipsoidal Cr phase and spherical Heusler phase CrCu<sub>2</sub>(ZrMg), which are dispersed near the dislocation line. After multi-step treatment, the size of CrCu<sub>2</sub>(ZrMg) particles is 4-6&#xa0;nm, which is smaller than before. The Cr particles are even finer in size, only 3-5&#xa0;nm. The multi-step deformation-aging strengthening effect is the result of the interaction between the dislocations, precipitates and residual solute atoms.</p>

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Synergistic Strengthening of Cu-Cr-Zr-Mg Alloy by Multi-step Deformation-Aging Process

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Xiaohong Yang,
  • Jiaming Wang,
  • Chengde Wang,
  • Ziyi He,
  • Peng Xiao

摘要

Cu-1.0Cr-0.25Zr-0.3Mg alloys were fabricated by vacuum induction melting, cast in a copper mold and subjected to multi-step deformation-aging treatment. Through the synergistic effect of precipitates and dislocations, we successfully achieved high conductivity of 98.7% IACS, high hardness of 192.2 HB and high strength of 559.7 MPa in Cu-1.0Cr-0.25Zr-0.3Mg alloy. Different from the traditional treatment, this study adopts a new multi-step deformation-aging treatment, which can effectively improve the decrease in conductivity caused by deformation, strengthen the contribution of dislocations and precipitates, and achieve dual-phase strengthening. Compared with single-step deformation-aging, the properties are greatly improved and the plasticity is restored. After single-step treatment, two types of nano-precipitates appear in the alloy, which are semi-coherent ellipsoidal Cr phase and spherical Heusler phase CrCu2(ZrMg), which are dispersed near the dislocation line. After multi-step treatment, the size of CrCu2(ZrMg) particles is 4-6 nm, which is smaller than before. The Cr particles are even finer in size, only 3-5 nm. The multi-step deformation-aging strengthening effect is the result of the interaction between the dislocations, precipitates and residual solute atoms.