TY - JOUR
T1 - 3D microstructural characterization and mechanical properties of constituent particles in Al 7075 alloys using X-ray synchrotron tomography and nanoindentation
AU - Singh, Sudhanshu S.
AU - Schwartzstein, Cary
AU - Williams, Jason J.
AU - Xiao, Xianghui
AU - De Carlo, Francesco
AU - Chawla, Nikhilesh
N1 - Funding Information:
The authors are grateful for financial support from the Office of Naval Research (ONR) under Contract No. N00014-10-1-0350 (Dr. A.K. Vasudevan, Program Manager). The authors are thankful to Huxiao Xie, Carl Mayer, Antony Kirubanandham at Arizona State University and Phillip Agee at Agilent Technologies, Chandler, Arizona, for helpful discussions on nanoindentation.
PY - 2014/7/25
Y1 - 2014/7/25
N2 - Inclusions (constituent particles) in Al 7075 alloys can be classified as Fe-bearing and Si-bearing inclusions. They play important roles in the deformation behavior, particular under fatigue loading. Thus, in order to understand the deformation behavior under fatigue loading of Al 7075 alloys, it is important to investigate the size and distribution of these inclusions and porosity in the material, along with their mechanical properties. X-ray synchrotron tomography was used to obtain the 3D microstructure of these microconstituents in Al 7075 alloy. Quantitative analysis in terms of volume, size, and morphology of inclusions and porosity was performed. The mechanical properties of these constituent particles along with the matrix were obtained using nanoindentation. Scanning electron microscopy (SEM) and EDS was used to analyze the indentations after testing. The Young's modulus and hardness of all inclusions were higher than the matrix. The Young's modulus values of Al 7Cu2Fe, Al23Fe4Cu, and Mg 2Si were measured to be 160.2 ± 10.9, 139.5 ± 3.7, and 94.8 ± 7.5 GPa respectively. Values of hardness of Al7Cu 2Fe, Al23Fe4Cu, and Mg2Si were 8.8 ± 0.9, 7.5 ± 0.8, and 5.2 ± 0.5 GPa respectively. Comparison of these values with nanoindentation data in the literature was also conducted.
AB - Inclusions (constituent particles) in Al 7075 alloys can be classified as Fe-bearing and Si-bearing inclusions. They play important roles in the deformation behavior, particular under fatigue loading. Thus, in order to understand the deformation behavior under fatigue loading of Al 7075 alloys, it is important to investigate the size and distribution of these inclusions and porosity in the material, along with their mechanical properties. X-ray synchrotron tomography was used to obtain the 3D microstructure of these microconstituents in Al 7075 alloy. Quantitative analysis in terms of volume, size, and morphology of inclusions and porosity was performed. The mechanical properties of these constituent particles along with the matrix were obtained using nanoindentation. Scanning electron microscopy (SEM) and EDS was used to analyze the indentations after testing. The Young's modulus and hardness of all inclusions were higher than the matrix. The Young's modulus values of Al 7Cu2Fe, Al23Fe4Cu, and Mg 2Si were measured to be 160.2 ± 10.9, 139.5 ± 3.7, and 94.8 ± 7.5 GPa respectively. Values of hardness of Al7Cu 2Fe, Al23Fe4Cu, and Mg2Si were 8.8 ± 0.9, 7.5 ± 0.8, and 5.2 ± 0.5 GPa respectively. Comparison of these values with nanoindentation data in the literature was also conducted.
KW - Mechanical properties
KW - Microstructure
KW - Multiphase intermetallics
KW - Nanoindentation
KW - X-ray tomography
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U2 - 10.1016/j.jallcom.2014.03.010
DO - 10.1016/j.jallcom.2014.03.010
M3 - Article
AN - SCOPUS:84897379192
SN - 0925-8388
VL - 602
SP - 163
EP - 174
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -