Abstract
This research focuses on the fabrication of aluminum wires treated with MoB2 nanoparticles and their effect on selected mechanical and thermal properties of the wires. These nanoparticles were obtained by fragmentation in a high-energy ball mill and then mechanically alloyed with pure aluminum powder to form Al/MoB2 pellets. The pellets were added to molten pure aluminum (99.5%) at 760 °C. Afterwards, the treated melt was cast into cylindrical ingots, which were cold-formed to the desired final diameter with intermediate annealing. X-ray diffraction and optical microscopy allowed characterizing the structure and microstructure of the material. The wires underwent tensile and bending tests, as well as electrical measurements. Finally, this research demonstrated how the mechanical properties of aluminum wires can be enhanced with the addition of MoB2 nanoparticles with minimal effects on the material resistivity.
Highlights
Many challenges regarding low-cost fabrication processes and better properties of electronic packages have compelled researchers to investigate composites made of aluminum/diamond and aluminum/graphene
After the X-ray diffraction (XRD) analysis, the ensuing Al/MoB2 nanocomposite pellets were added to the said molten aluminum
We determined the most time-efficient milling procedure to produce the MoB2 nanoparticles at 1600 rpm using XRD of the powders milled upon several times: 1 to 5 h
Summary
Many challenges regarding low-cost fabrication processes and better properties of electronic packages have compelled researchers to investigate composites made of aluminum/diamond and aluminum/graphene. These materials possess appealing properties, such as low coefficient of thermal expansion (CTE) and high thermal conductivity [1,2,3,4,5,6,7]. Through an advanced procedure, these researchers demonstrated how the addition of MgB2 nanoparticles increased the ultimate tensile strength (UTS) of the said wires with only a small decrease in electrical conductivity [8]. In a comparative study using NbB2 and ZrB2 nanoparticles, it was found that while both diborides raised the maximum tensile strength of the wires; in this case, only the wires bearing ZrB2 nanoparticles did not present significant electrical conductivity losses [9]
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