TY - JOUR
T1 - Analysis of the fractal dimension of grain boundaries of AA7050 aluminum alloys and its relationship to fracture toughness
AU - Khanbareh, Hamideh
AU - Wu, Xiaomin
AU - Van Der Zwaag, Sybrand
PY - 2012/9
Y1 - 2012/9
N2 - Quantitative analysis of the grain boundaries in partially recrystallized microstructures of heat-treated 7050 aluminum alloys has been performed. Fractal dimensions of the extracted grain boundaries were calculated by boxcounting method. Five different types of tear-tested materials rolled in different processes each at two orientations of 0° and 90° were studied. Efforts were made to connect the fractal dimensions of grain boundaries in the crack propagation direction to the fracture toughness (unit propagation energy, UPE, in tear test). The results show that there is a linear correlation between UPE and the fractal dimensions of the grain boundaries along the crack propagation direction for both 0° and 90° samples. The dependence corresponds well with the observation of transition from intergranular fracture to transgranular fracture with the increase of UPE. Quantitative analysis has also been performed on the micrographs to estimate the degree of recrystallization and the grain size in crack growth direction. No correlation between the fraction of recrystallized grains and the UPE could be detected.
AB - Quantitative analysis of the grain boundaries in partially recrystallized microstructures of heat-treated 7050 aluminum alloys has been performed. Fractal dimensions of the extracted grain boundaries were calculated by boxcounting method. Five different types of tear-tested materials rolled in different processes each at two orientations of 0° and 90° were studied. Efforts were made to connect the fractal dimensions of grain boundaries in the crack propagation direction to the fracture toughness (unit propagation energy, UPE, in tear test). The results show that there is a linear correlation between UPE and the fractal dimensions of the grain boundaries along the crack propagation direction for both 0° and 90° samples. The dependence corresponds well with the observation of transition from intergranular fracture to transgranular fracture with the increase of UPE. Quantitative analysis has also been performed on the micrographs to estimate the degree of recrystallization and the grain size in crack growth direction. No correlation between the fraction of recrystallized grains and the UPE could be detected.
UR - http://www.scopus.com/inward/record.url?scp=84864467102&partnerID=8YFLogxK
UR - https://doi.org/10.1007/s10853-012-6544-6
U2 - 10.1007/s10853-012-6544-6
DO - 10.1007/s10853-012-6544-6
M3 - Article
AN - SCOPUS:84864467102
VL - 47
SP - 6246
EP - 6253
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 17
ER -