급속 가열에 의한 나노구조의 AlCr2-Al2O3 복합재료 합성과 소결 및기계적 특성

Simultaneous Synthesis and Sintering of a Nanocrystalline AlCr2-Al2O3 Composite by Rapid Heating and Its Mechanical Properties

A dense nanostuctured AlCr2-Al2O3 composite was sintered by pulsed current activated heating up to 1200 °C within 2 min from mechanically milled powders. The advantage of this process is that it allows very quick densification to near theoretical density and prohibition of grain growth in nanostructured materials. A highly dense AlCr2-Al2O3 composite with a relative density of up to 96% was produced under application of a 80 MPa pressure and a pulsed current of 2000 A. The fracture toughness and hardness of the AlCr2-Al2O3 composite in this study was better than those of previous studies due to the grain refinement. The microstructure and mechanical properties of the composite were investigated using field emission scanning electron microscopy and a Vickers hardness tester.

A dense nanostuctured AlCr2-Al2O3 composite was sintered by pulsed current activated heating up to 1200 °C within 2 min from mechanically milled powders. The advantage of this process is that it allows very quick densification to near theoretical density and prohibition of grain growth in nanostructured materials. A highly dense AlCr2-Al2O3 composite with a relative density of up to 96% was produced under application of a 80 MPa pressure and a pulsed current of 2000 A. The fracture toughness and hardness of the AlCr2-Al2O3 composite in this study was better than those of previous studies due to the grain refinement. The microstructure and mechanical properties of the composite were investigated using field emission scanning electron microscopy and a Vickers hardness tester.