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Microstructural evolution and properties of aged Cu-3Ti-3Ni alloy

Liu, Jia, Wang, Xianhui, Guo, Tingting, Zou, Juntai and Yang, Xiaohong 2016, Microstructural evolution and properties of aged Cu-3Ti-3Ni alloy, Rare metal materials and engineering, vol. 45, no. 5, pp. 1162-1167, doi: 10.1016/S1875-5372(16)30113-8.

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Title Microstructural evolution and properties of aged Cu-3Ti-3Ni alloy
Author(s) Liu, Jia
Wang, Xianhui
Guo, Tingting
Zou, Juntai
Yang, Xiaohong
Journal name Rare metal materials and engineering
Volume number 45
Issue number 5
Start page 1162
End page 1167
Total pages 6
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-05
ISSN 1002-185X
Keyword(s) copper alloy
aging
phase transformation
precipitation
Summary The effect of aging treatment on the microstructure and the properties of Cu-3Ti-3Ni alloy was studied. The microstructure and the precipitated phase were characterized by X-ray diffractometer, scanning electron microscope and transmission electron microscope, and hardness, electrical conductivity and elastic modulus were measured as well. The results show that a number of Ni3Ti and β'-Cu4Ti phases precipitate from the Cu matrix after aging treatment. With the increase of secondary aging time, partial alloying elements dissolve into the Cu matrix, and the metastable Cu4Ti phase transforms into incoherent equilibrium Cu3Ti phase. The enhanced electrical conductivity is ascribed to the decrease of Ti solubility in the Cu matrix by the formation of the Ni3Ti and β'-Cu4Ti precipitates. After an appropriate aging treatment of Cu-3Ti-3Ni alloy, the Ni3Ti and coherent metastable β'-Cu4Ti phases precipitate completely, giving rise to the increase of hardness. Aging treatment has no obvious effect on the elastic modulus of Cu-3Ti-3Ni alloy. In the scope of the experiments, the optimal two-step aging treatment parameter for Cu-3Ti-3Ni alloy is to age at 300℃ for 2 h followed by aging at 450℃ for 7 h. The HV hardness, the electrical conductivity and elastic modulus are 1.83 GPa, 31.34 %IACS (International Annealed Copper Standard) and 148.62 GPa, respectively.
Language eng
DOI 10.1016/S1875-5372(16)30113-8
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 0 Not Applicable
HERDC Research category C3 Non-refereed articles in a professional journal
Copyright notice ©2016, Northwest Institute for Nonferrous Metal Research
Persistent URL http://hdl.handle.net/10536/DRO/DU:30087009

Document type: Journal Article
Collection: Institute for Frontier Materials
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