Microstructural evolutions of a Cu75-Fe5-Ni20 alloy depending on the isothermal annealing temperatures

• Published in: Metals and Materials International Vol. 18; no. 3; pp. 521 - 525
• Main Authors: Kang, Sung, Bae, Dong-Sik, Takeguchi, Masaki, Hong, Ki-Jung, Chang, Chang-Hwan, Takeda, Mahoto
• Format: Journal Article
• Language: English; Japanese
• Published: Springer Springer Science and Business Media LLC 01.06.2012; The Korean Institute of Metals and Materials; 대한금속·재료학회
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Engineering Thermodynamics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Processes; Solid Mechanics; 재료공학; precipitation; alloys; annealing; TEM
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-012-3022-2

The microstructures formed in a Cu 75 -Fe 5 -Ni 20 alloy on isothermal annealing at 1073 K were investigated by means of transmission electron microscopy (TEM) and the EELS element mapping technique, to compare with the precipitation phenomena occurring at 873 K. Cubic and rod precipitates were simultaneously formed in the copper matrix in the initial stage of annealing at 1073 K. This feature shows a sharp contrast to the feature observed at 873 K, 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 isothermal annealing at 1073 K.