| Abstract Scope |
The balancing of strength and ductility in metallic alloys remains a significant technical challenge to date. Precipitation strengthening of alloys usually results in higher strength with a proportional loss of ductility due to stress localization. A recent class of materials, complex concentrated alloys (CCA), have shown promising mechanical properties. In this work, we demonstrate that high strength ductility synergy can be achieved through tuning the microstructure of precipitation strengthened FeCoNiAlxTiy based CCA. An exceptional strength-ductility synergy with an ultrahigh tensile yield strength of 1.2 GPa and a large ductility of 40%. The kinetics study was carried out at various temperatures and times. The structure-property correlation was studied using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, differential scanning calorimetry, electron back scattered diffraction, Nanoindentation, hardness test, and tensile test. The properties was correlated with microstructural characteristics such as grain boundary, twin boundaries, precipitate size and shape, and interfacial stress. |