Journal
MATERIALS CHARACTERIZATION
Volume 105, Issue -, Pages 129-135Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.05.012
Keywords
Cu-Fe alloy; Microstructure; alpha-Fe precipitates; Electron diffraction
Categories
Funding
- Non-ferrous Metals Foundation of Hunan Province [YSZN2013CL06]
- Open-End Fund for the Valuable and Precision Instruments of Central South University [CSUZC20140012]
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The microstructure and orientation of alpha-Fe precipitates after a small amount of deformation in a polycrystalline Cu-2.1 wt.% Fe alloy were investigated. Analysis of electron diffraction patterns and Moire fringes of alpha-Fe precipitates showed that the orientation relationship between alpha-Fe precipitates and Cu matrix was close to Pitsch relationship, while the results were contrary to the previous research. The simulated diffraction pattern along the [001](Cu), was established and the result was in good agreement with the experimental observation, which indicated that the mutually perpendicular streaks along < 220 >(Cu) directions came from the diffractions of precipitates in four variants. The interaction between the 1 (1) over bar0(Fe)/(1) over bar 10(Fe) diffraction of precipitates (under [110](Fe) zone axis) and the 200(Cu)/020(Cu), diffraction of matrix (under [001](Cu) zone axis) resulted in Moire fringes normal to the < 220 >(Cu), direction with spacing about 0.98 nm in the corresponding precipitates. After aging treatment, the twinned structure in the alpha:Fe precipitates disappeared and the orientation relationship between those alpha-Fe precipitates and Cu matrix finally satisfied Kurdjumov-Sachs relationship. It is concluded that Pitsch relationship and KS relationship can co-exist in polycrystalline Cu-2.1Fe alloy. (C) 2015 Elsevier Inc. All rights reserved.
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