Effect of Fe content on microstructure and properties of Cu-Ti-Ni-xFe alloys

doi:10.13251/j.issn.0254-6051.2024.01.014

Abstract

Abstract: Phase diagram of Cu-2.5Ti-2Ni-xFe quaternary alloy was drawn by Pandat software, and the existing form of Fe in the alloy was predicted. Subsequently, four Cu-2.5Ti-2Ni-xFe(x=0, 0.4, 0.8, 1.5) alloys with different Fe contents were prepared by vacuum melting, annealing, hot rolling, solid solution treatment, cold rolling and aging to investigate the effects of Fe content on the microstructure and properties of the as-cast and aged Cu-Ti-Ni-xFe alloys. The results show that Fe exists in the form of FeTi phase and Fe₂Ti phase in the Cu-2.5Ti-2Ni-xFe alloys, and the addition of Fe leads to the formation of coarse second phase in the as-cast microstructure, which reduces the hardness of the alloy. However, after aging, the hardness and electrical conductivity of the alloys with Fe addition are obviously improved, and the high temperature softening resistance is also better. Among the alloys, the Cu-2.5Ti-2Ni-0.8Fe alloy has the best properties, its hardness and electrical conductivity are 274.26 HV and 17.6%IACS, respectively, and its softening temperature reaches 526 ℃.

Key words: Cu-Ti-Ni-Fe alloy, microstructure, physical property, softening resistance, Fe content

CLC Number:

TG146.1

Jing Qingxiu, Peng Yong, Xiao Xiangpeng, Wei Dandan, Yang Xueqing, Hang Xiaodong. Effect of Fe content on microstructure and properties of Cu-Ti-Ni-xFe alloys[J]. Heat Treatment of Metals, 2024, 49(1): 96-102.

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