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Structure and mechanical Properties of Al‐40% Cu Directionally Solidified Alloy
Author(s) -
ElMahallawy N. A.,
Taha M. A.
Publication year - 1977
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19770081007
Subject(s) - eutectic system , dendrite (mathematics) , materials science , alloy , temperature gradient , fracture (geology) , metallurgy , composite material , crystallography , chemistry , geometry , mathematics , physics , quantum mechanics
Commercial purity Al‐40% Cu alloys were directionally solidified under a constant temperature gradient of 9 K/mm and growth rate (R) varying from 8 to 305 μm/sec. Cellular structure was obtained with a single primary CuAl 2 rod‐like dendrite in the cell centre and a fanned‐out eutectic structure surrounding it, while the boundary was composed of a coarser eutectic structure. The intercellular spacing and/or the CuAl 2 interdendritic spacing varied with (R) −1/3 . The UTS increased with R and was found to be lower than that of AlCuAl 2 eutectics grown under similar conditions. The fracture strength of the primary CuAl 2 dendrites was calculated and was found to increase with decreasing their cross‐sectional area.