Abstract
Ultrafine-grained (UFG) Al 7050 alloy of the 7xxx series demonstrates very high strength at room temperature with UTS=845 MPa and hardness Hv=255, which considerably exceeds the value after conventional heat treatment T73, i.e. Hv=165. It is also revealed that with increasing temperature the alloy exhibits rather high ductility with elongation to failure δ=170% at 120 °C and strain rate of 5×104 s-1 and typical superplastic behavior with δ=480% and δ=690% at temperatures 170 °C and 200 °C correspondingly. Such values of superplasticity (SP) temperature are considerably lower than that typical of this alloy with micron-sized grains (TSP=450-500 °C). Such reduction in superplasticity temperature made it possible to preserve ultrafine grains in the alloy structure and provide its high-strength state after SP straining.
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CITATION STYLE
Bobruk, E. V., Murashkin, M. Y., Lomakin, I. V., Kazykhanov, V. U., & Valiev, R. Z. (2018). Low Temperature Superplasticity of High-Strength Ultrafine-Grained Al 7050 alloy. In IOP Conference Series: Materials Science and Engineering (Vol. 461). Institute of Physics Publishing. https://doi.org/10.1088/1757-899X/461/1/012090
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