Effect of residual structural strain caused by the addition of Co3O4 nanoparticles on the structural, hardness and magnetic properties of an Al/Co3O4 nanocomposite produced by powder metallurgy
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第3期
论文作者：Seyed Rahim Kiahosseini Hossein Ahmadian
文章页码：384 - 390
摘 要：Al composites are of interest due to their appropriate ratio of strength to weight. In our research, an Al/Co3O4 nanocomposite was generated using a sintering technique. The powders of Al with various Co3O4 nanoparticle contents（0 wt%, 0.5 wt%, 1.0 wt%, 1.5 wt%, 2.0 wt%, and2.5 wt%） were first blended using planetary milling for 30 min, and compressed in a cylindrical steel mold with a diameter of 1 cm and a height of5 cm at a pressure of 80 MPa. The samples were evaluated with X-ray diffractometry（XRD）, scanning electron microscopy（SEM）, Vickers hardness, and a vibrating sample magnetometer（VSM）. Although the crystallite size of the Al particles remained constant at 7–10 nm, the accumulation of nanoparticles in the Al particle interspace increased the structural tensile strain from 0.0045 to 0.0063, the hardness from HV 28 to HV 52 and the magnetic saturation from 0.044 to 0.404 emu/g with an increase in Co3O4 nanoparticle content from 0 wt% to 2.5 wt%.
Seyed Rahim Kiahosseini，Hossein Ahmadian
Department of Engineering, Damghan Branch, Islamic Azad University
摘 要：Al composites are of interest due to their appropriate ratio of strength to weight. In our research, an Al/Co3O4 nanocomposite was generated using a sintering technique. The powders of Al with various Co3O4 nanoparticle contents（0 wt%, 0.5 wt%, 1.0 wt%, 1.5 wt%, 2.0 wt%, and2.5 wt%） were first blended using planetary milling for 30 min, and compressed in a cylindrical steel mold with a diameter of 1 cm and a height of5 cm at a pressure of 80 MPa. The samples were evaluated with X-ray diffractometry（XRD）, scanning electron microscopy（SEM）, Vickers hardness, and a vibrating sample magnetometer（VSM）. Although the crystallite size of the Al particles remained constant at 7–10 nm, the accumulation of nanoparticles in the Al particle interspace increased the structural tensile strain from 0.0045 to 0.0063, the hardness from HV 28 to HV 52 and the magnetic saturation from 0.044 to 0.404 emu/g with an increase in Co3O4 nanoparticle content from 0 wt% to 2.5 wt%.
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