Precipitation and dissolution of Ag in ageing hypoeutectic alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:622

Article

Zuo, Xiaowei¹  Han, Ke²  Zhao, Congcong¹  Niu, Rongmei²  Wang, Engang¹ 

[1] Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang 110004, Peoples R China

[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

关键词: Cu-Ag alloy;    Precipitation;    Dissolution;    DSC;    Microhardness;    Resistivity;   

DOI  :  10.1016/j.jallcom.2014.10.037

来源: Elsevier

【 摘 要 】

Understanding the precipitate kinetics of Ag in proeutectic Cu is valuable to optimize the precipitation and morphology of Ag for high strength high conductivity hypoeutectic Cu-Ag alloys. The precipitation behaviors of as-solution treated Cu28 wt.%Ag alloys were analyzed by differential scanning calorimetric (DSC). The results indicated that the activation energies of Ag-rich phase formation and dissolution were 55.3 +/- 22.4 kJ/mol and 129.1 +/- 20.7 kJ/mol, respectively. The as-solution alloy was further aged at different temperatures for 2 h. Their microhardness and electrical resistivity were measured. The results demonstrated that at the ageing temperature of 405 degrees C, less scattering effects reflected more Ag precipitations from Cu matrix than the rest of temperatures. At 475 degrees C, however, Ag precipitates produced more strengthening effects. Above results were related to the competition between precipitation and dissolution of Ag in proeutectic Cu. This interpretation is supported by TEM observations on Ag precipitation. (C) 2014 Elsevier B.V. All rights reserved.

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