%0 Journal Article
%T Solidification microstructures in a short fiber reinforced alloy composite containing different fiber fractions
%A JING Qing-xiu
%A ZHU Ying-lu
%J China Foundry
%D 2006
%I Foundry Journal Agency
%X The solidification microstructures and micro-segregation of a fiber reinforced Al-9 Cu alloy, containing different volume fractions of Al2O3 short fibers about 6 ¦Ìm diameter and made by squeeze casting have been studied. The results indicate that as volume fraction of fiber Vf increases, the size of final grains becomes finer in the matrix. If ¦Ëf /¦Ë£¾1, the fibers have almost no influence on the solidification behavior of the matrix, so the final grains grow coarse, where ¦Ëf is the average inter-fiber spacing and ¦Ë is the secondary dendrite arm spacing. While if ¦Ëf /¦Ë£¼1, the growth of crystals in the matrix is affected significantly by the fibers and the grain size is reduced to the value of the inter-fiber spacing. The fibers influence the average length of a solidification volume element L of the matrix and also influence the solidification time ¦Èt of the matrix. As a result of fibers influencing L and ¦Èt, the micro-segregation in the matrix is improved when the composite contains more fibers, although the level of the improvement is slight. The Clyne-Kurz model can be used to semi-quantitatively analyze the relationship between Vf and the volume fraction fe of the micro-segregation eutectic structure.
%K short fiber
%K composite
%K fiber fractions
%K volume fraction
%K micro-segregation
%U http://www.foundryworld.com/uploadfile/20093450999001.pdf