Microstructure effects on tensile brittleness of as-quenched ZL205A in elevated temperature

摘要

Solution quenching process is a critical heat treatment process for aluminum alloy aiming at obtaining better strength and homogeneous super solid solution.In this paper, the mechanical properties of ZL205A in as-quenched state which is used for constructing large thin wall components are tested.ZL205A shows well performance under loading force in room temperature, while losing its toughness and behaving tensile brittleness, which are unexpected.at elevated temperature (especially at 300 °C).After observing the fracture sections of ZL205A at room temperature and 300 °C, one possible reason leading to this phenomena may own to the formation of T phase that gathering at grain boundaries.Such hypothesis are validated and discussed with the help of SEM observations.