Abstract
Graded materials can be generated in the age-hardenable commercial alloy Al 2017 by thermomechanical surface treatments. Firstly, plastic deformation is introduced into the surface layer by a shot peening process. Then, a carefully selected heat treatment is performed such that the aging response is more pronounced in the surface layer than in the interior. Using this procedure, it is possible to develop microstructural gradients which directly correspond to loading gradients which are present owing to notches. In other words, the properties of the alloy can be tailored to the local loading conditions. The alloy Al 2017 was chosen because its aging response is known to be sensitive to the degree of prior cold work. Notch-tensile properties can be improved over those of conventionally treated material by development of a strength gradient corresponding to that of the equivalent stress. Using an Almen intensity of 0.10mmA and age hardening at 170°C, the proportional limit can be increased without any significant loss in ductility as assessed by reduction in area.
Original language | English |
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Pages (from-to) | 313-318 |
Number of pages | 6 |
Journal | Materials Science Forum |
Volume | 308-311 |
DOIs | |
State | Published - 1999 |
Event | Proceedings of the 1998 5th International Symposium on Functionally Graded Materials, FGM '98 - Dresden, Ger Duration: 26 Oct 1998 → 29 Oct 1998 |