Effect of preparation method and heat treatment on microstructure and properties of Cu-Ni-Si alloy

•Cu Ni Si alloy was prepared by hot-pressing sintering.•The sintered microstructure is mainly composed of Ni31Si12 phase and Ni2Si phase.•The Ni2Si phase precipitated after aging treatment was fibrous.•The comprehensive properties of the alloy were obviously improved. In this work, Cu-Ni-Si alloy wa...

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Bibliographic Details
Published in:Materials letters 2022-05, Vol.315, p.131790, Article 131790
Main Authors: Tao, Shiping, Lu, Zhenlin, Xie, Hui, Zhang, Jinlong, Wei, Xin
Format: Article
Language:English
Subjects:
Aging
Aging (metallurgy)
Aging treatment
Alloy powders
Alloys
Banded structure
Copper
Copper base alloys
Cu-Ni-Si alloys
Electrical resistivity
Grain boundaries
Hot pressing sintering
Materials science
Mechanical properties
Metallurgy
Miacrostructure
Microstructural analysis
Microstructure
Nickel
Powder metallurgy
Precipitates
Pressing
Raw materials
Silicon
Sintering (powder metallurgy)
Solution heat treatment
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Summary:•Cu Ni Si alloy was prepared by hot-pressing sintering.•The sintered microstructure is mainly composed of Ni31Si12 phase and Ni2Si phase.•The Ni2Si phase precipitated after aging treatment was fibrous.•The comprehensive properties of the alloy were obviously improved. In this work, Cu-Ni-Si alloy was prepared by hot-pressing sintering using Cu, Ni, and Si powders as raw material. The alloy was afterwards exposed to solution treatment at 900 °C for 2 h and aging at 450 °C for 4 h. The microstructural analysis revealed that the alloy was mainly composed of the granular Ni31Si12 phase at the grain boundaries and the fine δ-Ni2Si phase inside the grains after hot-pressing sintering. After solution treatment, the Ni2Si phase disappeared completely while a small quantity of Ni31Si12 was still observed. However, there was a large amount of fibrous δ-Ni2Si precipitates after aging. The mechanical properties and electrical conductivity of the alloy were tested as well. After aging, the alloy exhibited the best comprehensive characteristics with the hardness of 248.6 HV and the conductivity of 40% IACS. Therefore, the banded structure of Cu-Ni-Si alloys prepared by powder metallurgy and subjected to aging exerts a positive influence on their properties.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2022.131790