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Effect of solidification rate on microstructures and orientations of Al‐Cu hypereutectic alloy in thin crucible
Author(s) -
Gao Ka,
Li Shuangming,
Xu Lei,
Fu Hengzhi
Publication year - 2014
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201300368
Subject(s) - crucible (geodemography) , microstructure , materials science , alloy , phase (matter) , directional solidification , dendrite (mathematics) , texture (cosmology) , morphology (biology) , growth rate , metallurgy , crystallography , geometry , chemistry , mathematics , computational chemistry , organic chemistry , artificial intelligence , biology , computer science , image (mathematics) , genetics
The microstructures and orientations of Al‐40%Cu hypereutectic alloy prepared in a 0.45 mm high‐purity alumina crucible at different directional solidification rates (5, 10 and 100 μm/s) were investigated. With solidification rate increasing, the primary phase Al 2 Cu of the alloy transits from complex dendrite morphologies to regular faceted square shapes. The surfaces of regular square morphology about Al 2 Cu phase are {110} facets. The orientation text results by XRD showed that at a growth rate of 5 μm/s, the phase displayed texture orientations at (310), (110), and (220). At 100 μm/s, the phase possessed a very strong preferred orientation at (310). The experimental results showed that growth in small‐size samples at a higher growth rate can achieve a regular microstructure with preferred orientation. The growth morphologies are deduced from attachment energies descripted the microstructure evolution of the primary phase.