Relationship between tensile and shear strengths of the mushy zone in solidifying aluminum alloys |
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Authors: | A K Dahle T Sumitomo S Instone |
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Affiliation: | (1) the Division of Materials Engineering, The University of Queensland, 4072 Brisbane, Qld, Australia;(2) Research and Development, Hydro Aluminium Deutschland GmbH, 53117 Bonn, Germany |
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Abstract: | Strength development in the mushy zone during solidification of three aluminum alloys (Al-4 wt pct Cu, Al-7 wt pct Si-1 wt
pct Cu, and Al-7 wt pct Si-4 wt pct Cu) has been measured with two different techniques—horizontal tensile testing and direct
shear cell testing. The strength results from the two methods correspond with one another to a much higher degree than suggested
by the results presented in the literature. Tensile strength starts to develop at the maximum packing solid fraction, confirmed
by the shear strength measurements. The maximum packing fraction represents the point where the internal network structure
of the mushy zone is established and ligaments of the network must be broken to rearrange the dendrites. The data indicate
a converging trend of the shear and tensile strength at high solid fractions, therefore indicating that the deformation mechanisms
are also becoming similar. The results presented in this article suggest that it is possible to develop constitutive equations
for the mechanical properties of the mushy zone over the entire solid fraction regime, i.e., from coherency to complete solidification. These equations could be used for the prediction of stress development as well
as defect formation. |
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