首页|Flow behavior and forming characteristics of 2A14 aluminum alloy at cryogenic temperatures
Flow behavior and forming characteristics of 2A14 aluminum alloy at cryogenic temperatures
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NSTL
Elsevier
Cryogenic forming is a promising new method for aluminum alloy manufacturing due to its improved formability, but the mechanical properties and microstructure evolution of alloys deformed at cryogenic temperatures require further study. In this work, the flow behavior and detailed deformation mechanism of 2A14 alloy at cryogenic temperatures were systematically studied. Uniaxial tensile tests at 113–298 K with a strain rate from 0.00025 to 0.01 s?1 were carried out, and a constitutive model was established and modified. Then, the Erichsen cupping index (IE) values were tested at different temperatures (298 K, 203 K, and 113 K). Finally, the microstructure of cryogenically-deformed samples was studied by scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), X-ray diffractometry (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The stress-strain curves were serrated from 203 K to 298 K, but at temperatures below 203 K, a smooth curve was obtained due to the suppression of dynamic strain aging. The elongation and IE value of the alloy at 113 K were almost 51% and 21% higher than those obtained at 298 K, respectively. This was caused by the uniform deformation and the increased critical local dislocation density at cryogenic temperatures. The tensile strength increased by 27% at 113 K, and the improved strength was attributed to the high dislocation density deformation at cryogenic temperatures.
NSTL
Elsevier
