Jpn. J. Appl. Phys. 32 (1993) pp. 1164-1170  |Next Article|  |Table of Contents|
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Characterization of Deformed and As-cast Microstructure of Copper-Aluminium-Iron Alloys (α-Phase)

Hiranmay Pal, Swapan Kumar Pradhan and Madhusudan De

(Received September 24, 1992; accepted for publication November 21, 1992)

The microstructure of aluminium iron bronze, having nominal compositions Cu-1.5Fe-5Al, Cu-1.5Fe-10Al and Cu-1.5Fe-15Al (in at.%) has been characterized in the deformed and as-cast state by employing X-ray diffraction line profile analysis, microhardness studies, optical and scanning electron microscopy and magnetic susceptibility studies. From X-ray studies the stacking fault density <α> has been found to increase with increasing Al concentration relative to binary Cu-Al depicting the influence of small presence of Fe in the ternary alloys. The X-ray results further predict that stacking fault energy is lowered due to the influence of small presence of Fe. The results of the microhardness studies corroborate the findings of the X-ray study. Optical and scanning electron microscopy (SEM) studies reveal the grain and grain boundary structures containing Fe-rich precipitates. These precipitates are primarily responsible for the ferromagnetic behaviour of the materials.

URL: http://jjap.jsap.jp/link?JJAP/32/1164/
DOI: 10.1143/JJAP.32.1164

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