TY - JOUR
T1 - Study of microstructure evolution and properties of Cu-Fe microcomposites produced by a pre-alloyed powder method
AU - Wang, Fenglin
AU - Wakoh, Kimio
AU - Li, Yunping
AU - Ito, Shun
AU - Yamanaka, Kenta
AU - Koizumi, Yuichiro
AU - Chiba, Akihiko
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/7/15
Y1 - 2017/7/15
N2 - In this work, Cu-based microcomposites were fabricated by powder metallurgy of gas-atomized Cu-15wt% Fe alloy powder, followed by drawing to various strains. The microstructure evolution and the resultant mechanical and electrical properties were investigated by scanning electron microscopy, electron backscatter diffraction, and tensile testing, among other techniques. The results indicated that during drawing, the Fe phase evolved into nanoscale filaments along the longitudinal direction. With increasing drawing strain, both the Cu grains and the Fe filaments were refined gradually, giving rise to a mean thickness of approximately 25 nm for the Fe filaments at a total strain of 4.0. The iron oxides particles formed due to contamination of oxygen maintained unchanged during drawing process. In addition, it was found that an intermediate aging during the drawing can significantly enhance the electrical conductivity of the microcomposites without sacrificing their strength. The present process involving an initial powder with a homogenous distribution of Cu and fine Fe phases makes it possible to obtain microcomposites with an ideal combination of electrical and mechanical properties at lower drawing strain, compared to those produced by conventional casting methods.
AB - In this work, Cu-based microcomposites were fabricated by powder metallurgy of gas-atomized Cu-15wt% Fe alloy powder, followed by drawing to various strains. The microstructure evolution and the resultant mechanical and electrical properties were investigated by scanning electron microscopy, electron backscatter diffraction, and tensile testing, among other techniques. The results indicated that during drawing, the Fe phase evolved into nanoscale filaments along the longitudinal direction. With increasing drawing strain, both the Cu grains and the Fe filaments were refined gradually, giving rise to a mean thickness of approximately 25 nm for the Fe filaments at a total strain of 4.0. The iron oxides particles formed due to contamination of oxygen maintained unchanged during drawing process. In addition, it was found that an intermediate aging during the drawing can significantly enhance the electrical conductivity of the microcomposites without sacrificing their strength. The present process involving an initial powder with a homogenous distribution of Cu and fine Fe phases makes it possible to obtain microcomposites with an ideal combination of electrical and mechanical properties at lower drawing strain, compared to those produced by conventional casting methods.
KW - Cu-Fe microcomposite
KW - Electrical conductivity
KW - Hot consolidation
KW - In situ technique
KW - Microstructure evolution
KW - Strength
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U2 - 10.1016/j.matdes.2017.04.017
DO - 10.1016/j.matdes.2017.04.017
M3 - Article
AN - SCOPUS:85017638244
VL - 126
SP - 64
EP - 72
JO - International Journal of Materials in Engineering Applications
JF - International Journal of Materials in Engineering Applications
SN - 0264-1275
ER -