Microstructure and Mechanical Properties of Harmonic-Structured Al-Cu Alloy

抄録

Harmonic-structured Al-Cu alloys were produced via mechanical milling followed by spark plasma sintering, and their microstructure and mechanical properties were investigated in detail. The microstructure of the mechanically milled powders and spark plasma sintered compacts was characterized using scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The mechanical properties of the spark plasma sintered compacts were evaluated on the basis of the tensile tests and Vickers hardness tests. SEM/EDS micrographs and XRD profiles indicated that the harmonic-structured Al-Cu alloy compact has a network region composed of Al-Cu alloy with Al₂Cu precipitates and a dispersed region composed of pure Al. The harmonic-structured Al-Cu alloy compacts exhibit the superior hardness. Harmonic-structured control is effective for improving of the mechanical properties of the precipitation-hardened materials.