Relating microtexture and dynamic micro hardness in an extruded AA8090 alloy and AA8090-8 vol% SiC_pcomposite

Abstract

The present study involves combined measurements of microtexture and dynamic ultra micro hardness (DUH) in hot extruded AA8090 aluminum alloy and its composite reinforced with 8 vol% SiC p . Both the materials show strong crystallographic fiber textures-h111i and h001i. The dynamic micro hardness shows a clear pattern of difference between these two fiber textures, h111i oriented grains being harder and stiffer. The difference in q/d between the fibers, where q and d are the average cell misorientation and cell size, respectively, was marginal in the alloy and thus cannot explain the observed hardness difference. The hardness difference can be explained from the difference in Taylor factors between the respective fibers. Elastic stiffness values estimated from microtexture and DUH follow a similar trend qualitatively. q

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Crystallographic Dependence on Deformation Characteristics of Friction Stir Processed Pure Aluminum

“…Considering the ratio of hardness to tensile yield strength is not always consistent with a factor of 3 32) and the existence of orientation dependence on hardness. 33,34) We proposed that H 0 can be presented as H 0 = cM¸where c is a constant.…”

Orientation-dependent solid solution strengthening in zirconium: a nanoindentation study

“…For example, in high-purity thin films of aluminum single crystals the reported difference in hardness, between h111i and h001i grains, is 60%. This difference scales with estimated differences in Taylor factor [28]. Grains or orientations of aluminum alloys with a similar difference in Taylor factor, however, show a hardness difference of about 10% [28].…”

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