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In this paper, the effects of Nb addition on the mechanical properties, electrical conductivity and microstructure of the Cu-Ni-Si-Mg alloy were investigated. The results show that, after the secondary aging at 460 degrees C for 120 min, the alloy with 0.2 wt% Nb exhibits the best comprehensive properties with a hardness of 245.9 HV, a tensile strength of 747.28 MPa, a breaking elongation of 8.6%, and an electrical conductivity of 47.74 %IACS. The addition of Nb element can promote the precipitation of Ni2Si phase. The Nb-doped alloy has a higher quantity of precipitates and a smaller size of precipitates. The Nb element promotes the transition of the Ni2Si phase from a coherent to an incoherent relationship with the matrix in the Cu-Ni-Si-Mg alloy. In the initial stage of precipi-tation, the precipitation activation energy of the alloy with 0.2 wt% Nb is 46.86% lower than that of the alloy without Nb. The addition of Nb increases the proportion of sigma 3n (n = 1, 2, 3) grain boundary in the Cu-Ni-Si-Mg alloy. Furthermore, after the secondary aging, the Nb addition increases the recrystallized texture and recrys-tallized grains and decreases the cold-rolled texture and defects in the alloy.
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MATERIALS CHARACTERIZATION
ISSN: 1044-5803
Year: 2022
Volume: 194
4 . 7
JCR@2022
4 . 8 0 0
JCR@2023
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:91
JCR Journal Grade:1
CAS Journal Grade:1
Cited Count:
WoS CC Cited Count: 14
SCOPUS Cited Count: 14
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 3
Affiliated Colleges: