首页|Effects of Ni content on microstructure and wear behavior of Al-13Si-3Cu-1Mg-xNi-0.6Fe-0.6Mn alloys
Effects of Ni content on microstructure and wear behavior of Al-13Si-3Cu-1Mg-xNi-0.6Fe-0.6Mn alloys
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NSTL
Elsevier
As one of the lightweight and wear-resistance metallic structural materials, cast Al-Si alloys have been widely studied in automobile and defense industries to meet the greater demands for elevated-temperature wearresistance properties. In this study, the effect of Ni content on the microstructure and wear behavior of Al-13Si-3Cu-1Mg-xNi-0.6Fe-0.6Mn alloys were investigated by thermodynamic modeling, X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and ball-on-disk reciprocating sliding test. The results show that the θ-Al_2Cu and γ-Al_7Cu_4Ni phases are disappeared, while the δ-Al_3CuNi, ε-Al_3Ni, and T-Fe phases are formed with the increasing of Ni contents. The 3-D network structure is composed of α-Al matrix, eutectic Si, Q, Ni-rich, and Al_(15)(Mn, Fe)_3Si_2 phases, which leads to the best hardness and wear-resistance of the alloy with 2 wt% Ni. The fracture and debonding of excessive coarse ε-Al_3Ni phase deteriorate the wear-resistance and ductility of the 3Ni alloy. The main wear mechanisms of the tested alloys are abrasive, delamination and oxidative wear at 25℃ and convert to adhesive wear at 350℃.
NSTL
Elsevier
