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Xinrong Chen,Zhiming Xu,Dingfa Fu,Hui Zhang,Jie Teng,Fulin Jiang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
Hot compression tests were conducted on Al–Si/SiCp + TiB2 hybrid aluminium matrix composites with various TiB2contentsat temperatures from 350 to 500 °C and strain rates from 0.001 to 1 s−1. The hot workability characteristics and deformationmechanisms were investigated by combining constitutive equations, processing maps and microstructural observationsthrough scanning electron microscopy and transmission electron microscopy measurements. The results showed that therewere small differences in the peak stresses when the contents of TiB2were 3% and 5%, while the peak stress increased whenthe content of TiB2reached 8%. The contents of TiB2had little influence on the activation energy but affected the processingmaps to a certain extent. The areas of the instability zones were observed to gradually increase with increased TiB2additions. The optimal deformation conditions of the studied materials migrated from a low temperature and high strain rate to a hightemperature and low strain rate with increasing TiB2content. In addition, the flow softening mechanism transformed fromdynamic recrystallization + dynamic recovery to dynamic recovery with increasing TiB2content.
Long Zhang,Ruiqing Lu,Jie Tang,Fulin Jiang,Dingfa Fu,Hui Zhang,Jie Teng 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7
A continuously cast Al–Mg–Si–Cu alloy was processed by repetitive continuous extrusion forming (R-Conform) and thecorresponding deformation behaviors, microstructural evolution and mechanical properties were investigated systematicallyby combining uniaxial compression deformation, finite element simulation, microstructural observation and mechanicaltest. The results showed that the grain size of Al–Mg–Si–Cu alloy bar was gradually refined and became more uniformafter R-Conform processing with the increase of pass as a result of continuous dynamic recrystallization. The evolution ofmicrostructure was related to the complex thermomechanical conditions of temperature, shear rate and the distribution ofaccumulated strain during R-Conform process. Then the improvement of properties was obtained by the refined grains afterR-Conform processing. Further, the dense and fine precipitates formed after solution treatment and aging led to optimizedmechanical properties with tensile strength approximate 400 MPa and elongation about 17.8%.