Abstract
Creep-aging behavior of AA2050-T34 alloy loaded with 175 MPa at different temperature for 24 h has been experimentally investigated. Corresponding mechanical properties for different creep-aging periods have been studied by tensile tests. The microstructures of some selected specimens have been characterized by transmission electron microscopy (TEM) and the precipitation evolution at different temperatures has been analyzed. The results show that the creep strain of AA2050-T34 alloy increases greatly with increasing creep-aging temperature, while it obtains the maximum tensile strength at 160 °C. A “double primary creep feature” with four stages has been observed at 160 °C. A “slow deceleration stage” is also found between primary and steady creep stages at 185 °C. The typical creep feature is observed at other temperatures. Such creep-aging behaviors are affected by the evolution of microstructures, including dislocation, precipitation and solid solution. And the effects of temperature on their evolution during creep-aging tests are analyzed.
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