Effect of Zr element on microstructure and properties of Cu-6Ni-3Ti alloy

doi:10.13251/j.issn.0254-6051.2025.02.009

Abstract

Abstract: Effect of Zr content on the microstructure, mechanical properties and electrical conductivity of Cu-6Ni-3Ti-xZr alloy was investigated. The results show that zirconium elements mainly segregate at grain boundaries during solidification, forming zirconium-rich atomic clusters, slowing down the grain growth and inhibiting dendritic segregation. During the aging process, zirconium accumulates around the precipitated phases of the alloy, inhibiting the growth of the precipitated phases, and improving the hardness and its resistance to softening. When the content of zirconium elements is increased, Cu₄Zr is formed in the Cu-6Ni-3Ti-0.5Zr alloy. After aging at 450 ℃ for 2 h, the Cu-6Ni-3Ti-0.3Zr alloy has best mechanical and electrical properties, with tensile strength of 807 MPa, hardness of 230 HV2, electrical conductivity of 50%IACS.

Key words: copper alloy, zirconium, strengthening mechanism, precipitation

CLC Number:

TG146.1

Jing Qingxiu, Yang Xueqing, Wei Dandan, Wei Miao, Huang Xiaodong. Effect of Zr element on microstructure and properties of Cu-6Ni-3Ti alloy[J]. Heat Treatment of Metals, 2025, 50(2): 61-68.

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