TY - JOUR
T1 - Effect of sample size on intermetallic Al2Cu microstructure and orientation evolution during directional solidification
AU - Gao, Ka
AU - Li, Shuangming
AU - Xu, Lei
AU - Fu, Hengzhi
PY - 2014/5/15
Y1 - 2014/5/15
N2 - Al-40% Cu hypereutectic alloy samples were successfully directionally solidified at a growth rate of 10 μm/s in different sizes (4 mm, 1.8 mm, and 0.45 mm thickness in transverse section). Using the serial sectioning technique, the three-dimensional (3D) microstructures of the primary intermetallic Al 2Cu phase of the alloy can be observed with various growth patterns, L-shape, E-shape, and regular rectangular shape with respect to growth orientations of the (110) and (310) plane. The L-shape and regular rectangular shape of Al2Cu phase are bounded by {110} facets. When the sample size was reduced from 4 mm to 0.45 mm, the solidified microstructures changed from multi-layer dendrites to single-layer dendrite along the growth direction, and then the orientation texture was at the plane (310). The growth mechanism for the regular faceted intermetallic Al2Cu at different sample sizes was interpreted by the oriented attachment mechanism (OA). The experimental results showed that the directionally solidified Al-40% Cu alloy sample in a much smaller size can achieve a well-aligned morphology with a specific growth texture.
AB - Al-40% Cu hypereutectic alloy samples were successfully directionally solidified at a growth rate of 10 μm/s in different sizes (4 mm, 1.8 mm, and 0.45 mm thickness in transverse section). Using the serial sectioning technique, the three-dimensional (3D) microstructures of the primary intermetallic Al 2Cu phase of the alloy can be observed with various growth patterns, L-shape, E-shape, and regular rectangular shape with respect to growth orientations of the (110) and (310) plane. The L-shape and regular rectangular shape of Al2Cu phase are bounded by {110} facets. When the sample size was reduced from 4 mm to 0.45 mm, the solidified microstructures changed from multi-layer dendrites to single-layer dendrite along the growth direction, and then the orientation texture was at the plane (310). The growth mechanism for the regular faceted intermetallic Al2Cu at different sample sizes was interpreted by the oriented attachment mechanism (OA). The experimental results showed that the directionally solidified Al-40% Cu alloy sample in a much smaller size can achieve a well-aligned morphology with a specific growth texture.
KW - A1. Characterization
KW - A1. Crystal morphology
KW - A1. Dendrites
KW - A1. Directional solidification
KW - A2. Double crucible technique
KW - B1. Alloys
UR - http://www.scopus.com/inward/record.url?scp=84896796639&partnerID=8YFLogxK
U2 - 10.1016/j.jcrysgro.2014.02.023
DO - 10.1016/j.jcrysgro.2014.02.023
M3 - 文章
AN - SCOPUS:84896796639
SN - 0022-0248
VL - 394
SP - 89
EP - 96
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
ER -