Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1584154 | Materials Science and Engineering: A | 2007 | 6 Pages |
Abstract
The tensile properties of an as-cast A319 alloy were investigated as a function of temperature. It was found that the A319-Al alloy remained inherently brittle in the temperature range of â90 °C < T < 270 °C and the mechanical integrity was not satisfied as defined by the Considère criterion. Apparently, in this temperature range fracturing of brittle intermetallics, including Si particles is dominant. At T > 270 °C the mode of failure shifts to being essentially ductile by the development of numerous dimples. Under these conditions the development of critical stresses at matrix/particle interfaces needed for brittle fracture no longer occurs. Apparently, at these temperatures thermally activated processes lead to significant relaxation of stress incompatibilities at particle/matrix interfaces and results in appreciable plastic deformation within the matrix.
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Authors
E. Rincón, H.F. López, M.M. Cisneros, H. Mancha, M.A. Cisneros,