The Fe3Al-based intermetallics were prepared by mechanical alloying and spark plasma sintering （SPS）, and the influence of milling time on the properties of materials was investigated. The phase identification was i...The Fe3Al-based intermetallics were prepared by mechanical alloying and spark plasma sintering （SPS）, and the influence of milling time on the properties of materials was investigated. The phase identification was investigated by X-ray, and the surface morphology and fractography were observed by scanning electron microscope （SEM）. The mechanical properties such as bending strength, strain, and microhardness were tested. The results show that Fe reacts with Al completely to form Fe3Al during short SPS processing time. The relative densities of the sintered samples were nearly 100%. The mechanical properties of the sintered samples can be improved along with the milling time. The representative values are the bend strength of 1327 MPa and the microhardness of 434.展开更多
Analyses on the stress in the carbon nanotube/Fe3Al composites were performed.The biphase interface valence electron structure was established on the basis of Pauling's nature of the chemical bond.The stress occur...Analyses on the stress in the carbon nanotube/Fe3Al composites were performed.The biphase interface valence electron structure was established on the basis of Pauling's nature of the chemical bond.The stress occurs by the huge interface electron density difference,which will block the Fe3Al grain agglomeration and growth.With the X-ray diffractions,the calculated magnitude of compressive stress existing in the CNT/Fe3Al interface is 0.38 GPa.The experimental result verifies that the stress has a positive effect on the enhancement of mechanical properties of composite.展开更多
文摘The Fe3Al-based intermetallics were prepared by mechanical alloying and spark plasma sintering （SPS）, and the influence of milling time on the properties of materials was investigated. The phase identification was investigated by X-ray, and the surface morphology and fractography were observed by scanning electron microscope （SEM）. The mechanical properties such as bending strength, strain, and microhardness were tested. The results show that Fe reacts with Al completely to form Fe3Al during short SPS processing time. The relative densities of the sintered samples were nearly 100%. The mechanical properties of the sintered samples can be improved along with the milling time. The representative values are the bend strength of 1327 MPa and the microhardness of 434.
基金Project(Z200816)supported by Research Initial Foundation for Doctor of Shandong Jiaotong University,China
文摘Analyses on the stress in the carbon nanotube/Fe3Al composites were performed.The biphase interface valence electron structure was established on the basis of Pauling's nature of the chemical bond.The stress occurs by the huge interface electron density difference,which will block the Fe3Al grain agglomeration and growth.With the X-ray diffractions,the calculated magnitude of compressive stress existing in the CNT/Fe3Al interface is 0.38 GPa.The experimental result verifies that the stress has a positive effect on the enhancement of mechanical properties of composite.
