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Sung Kang,배동식,Masaki Takeguchi,Ki-Jung Hong,Chang-Hwan Chang,Mahoto Takeda 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.3
The microstructures formed in a Cu75-Fe5-Ni20 alloy on isothermal annealing at 1073K were investigated by means of transmission electron microscopy (TEM) and the EELS element mapping technique, to com-pare with the precipitation phenomena occurring at 873K. Cubic and rod precipitates were simultane-ously formed in the copper matrix in the initial stage of annealing at 1073K. This feature shows a sharp contrast to the feature observed at 873K, since only cubic precipitates were observed in the specimens isothermally aged at lower temperatures. The cubic precipitates tend to stretch their shapes along one of the <100> directions of the Cu matrix and to have rectangular shapes in the late stage of the annealing at both temperatures. This tendency was, however, more clearly observed in the specimen receiving the iso-thermal annealing at 1073K.