چكيده به لاتين
Nickel-aluminum bronze is a copper-based alloy with aluminum, nickel and iron additives. Due to its desirable corrosion properties and suitable mechanical properties, it has gained increasing attractiveness and application. In this study, the effect of different ratios of iron and nickel along with the effect of the gating system on the mechanical properties and microstructure of nickel-aluminum-bronze alloy has been investigated. In order to investigate the effect of the gating system and the role of melt turbulence in the mechanical properties, the prepared samples were cast by two methods: Top pouring and bottom filling. In this way, the presence of oxide films was also studied. Research shows that top pouring system weakens the mechanical properties due to turbulence as well as the presence of air entrainment in the part compared to the bottom filling system. This weakness can be expressed by proving the presence and study of oxide films. On the other hand, by reducing the amount of iron to 1.5%, the mechanical properties of the alloy decrease, and by increasing the amount of iron to 7%, the mechanical properties are partially improved. Also, in the case of nickel, it can be reported that the reduction of nickel compared to the control sample up to about 2% due to the dominance of iron over nickel increases the tensile strength and with increasing nickel up to 7%, mechanical properties are weakened.
