Microstructure and properties of microalloyed Cu-Ni-Sn-P alloy

doi:10.13251/j.issn.0254-6051.2022.09.029

Abstract

Abstract: Effect of different nickel-tin ratios on as-cast, solid-solution and aging microstructure and properties of Cu-Ni-Sn-P alloys was analyzed, so as to optimize the composition ratio of nickel and tin elements in Cu-Ni-Sn-P alloys by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), micro Vickers hardness tester and eddy current conductivity meter. At the same time, effect of different deformation heat treatment processes on the microstructure and properties of Cu-0.87Ni-1.82Sn-0.07P alloy was studied. The results show that for the Cu-Ni-Sn-P alloys with different composition, the Cu-Ni-Sn-P alloy (Cu-0.87Ni-1.82Sn-0.07P alloy) has the best comprehensive properties when Ni∶Sn is 1∶2, the hardness after solution and aging treatment is up to 119.9 HV0.5, and the conductivity is 35.0%IACS. The peak aging hardness of the alloy can be increased up to 164 HV0.5 after 30% pre-cold rolling before aging at 450 ℃. The fracture structure is mostly dimples with good toughness and the anti-softening temperature is 480 ℃. There is a tangential relationship between the age-strengthened precipitated phase and dislocation, and the precipitated phase presents spherical Ni-P particles. The precipitated particles at grain boundary are larger, and the precipitated particles in grain are generally smaller with sizes ranging from tens to hundreds of nanometers.

Key words: Cu-Ni-Sn-P alloy, pre-cold deformation, aging strengthening, morphology of Ni-P precipitated phase

CLC Number:

TG146.1

Xiong Shujun, Wan Jia, Chen Jinshui, Guo Chengjun, Xiao Xiangpeng. Microstructure and properties of microalloyed Cu-Ni-Sn-P alloy[J]. Heat Treatment of Metals, 2022, 47(9): 164-170.

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