Tensile properties in under-aged state 3J21 alloy at room temperature in atmospheric conditions

The tensile properties of 3J21 alloy in under-aged state was conducted on a universal tensile test machine at room temperature in atmospheric conditions.Moreover,a metallographic microscope and X-ray were used to analyze the metallographic structure and physical phase of the alloy in under-aged state.By employing a transmission electron microscope an analysis was conducted to the specimens of solid solution state and under-aged state as well as the microstructure of deformation near the tensile fracture.With the use of a scanning electron microscope a tensile fracture was observed.It was found that the tensile fracture of 3J21 alloy was a dimple fracture in under-aged state.The distance between the slip lines was smaller in the microstructure near the fracture of the alloy in under-aged state.The alloy in under-aged state featured a good match for the strength and plasticity.The influence of under-aged state on the tensile properties of 3J21 alloy is discussed at room temperature in atmospheric conditions.