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Dynamic Impact Behavior of 6061-T6 and 5083-H131 Aluminum alloys
Last modified: 2013-05-07
Abstract
The results of a comparative study on microstructural evolution and damage in
6061-T6 and 5083-H131 aluminum alloys tested at high strain rates are discussed.
Cylindrical samples of these alloys were tested in compression using instrumented
direct impact Hopkinson Bar. Retention of heat and intense thermal softening
along narrow bands during impact resulted in inhomogeneous deformation caused
by shear strain localization along these bands. Deformed bands consisting of
highly distorted and elongated grains were observed in the Aluminum 5083-H131
alloy after high velocity impact. On the other hand, adiabatic shear bands that
look similar to the white etching bands commonly found in hardened steels were
observed in the Aluminum 6061-T6 alloy. Whereas grain coarsening occurred
inside the adiabatic shear bands in the Aluminum 5083-H131 alloy, the adiabatic
shear bands in Aluminum 6061-T6 alloy were observed to contain much finer
grains than the bulk material.
6061-T6 and 5083-H131 aluminum alloys tested at high strain rates are discussed.
Cylindrical samples of these alloys were tested in compression using instrumented
direct impact Hopkinson Bar. Retention of heat and intense thermal softening
along narrow bands during impact resulted in inhomogeneous deformation caused
by shear strain localization along these bands. Deformed bands consisting of
highly distorted and elongated grains were observed in the Aluminum 5083-H131
alloy after high velocity impact. On the other hand, adiabatic shear bands that
look similar to the white etching bands commonly found in hardened steels were
observed in the Aluminum 6061-T6 alloy. Whereas grain coarsening occurred
inside the adiabatic shear bands in the Aluminum 5083-H131 alloy, the adiabatic
shear bands in Aluminum 6061-T6 alloy were observed to contain much finer
grains than the bulk material.
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