Correlation of grain-boundary precipitates parameters with fracture toughness in an Al–Cu–Mg–Ag alloy subjected to long-term thermal exposure |
| |
Authors: | B Q Li A P Reynolds |
| |
Affiliation: | (1) McCook Metals L.L.C,, 4900 First Avenue,, McCook,, IL 60525,, USA;(2) Department of Mechanical Engineering,, University of South Carolina,, Columbia,, SC 29208,, USA |
| |
Abstract: | The effect of thermal exposure on grain-boundary precipitation in Al–Cu–Mg–Ag alloy was studied using quantitative transmission electron microscopy. Grain-boundary precipitate parameters, such as average size, number density and precipitate-free zone width, were measured. The effective diameter of precipitates, number of precipitates per grain-boundary area and area fraction of precipitates on the grain boundary were calculated. These data were applied to a grain-boundary fracture model to calculate grain-boundary fracture strain. The calculated fracture strains, in turn, were used to check the validity of two existing models of fracture toughness, which are based on grain-boundary nucleation of cracks and their propagation through precipitate-free zones. The fracture toughness model of Hornbogen and Graf closely agrees with the experimental results. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|