Effect of Nickel and Iron Addition on the Structure and Mechanical Properties of Tin Bronze (Cu-10wt%Sn)
[1]
Kingsley Chidi Nnakwo, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
[2]
Ifeanacho Uchenna Okeke, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
[3]
Jerome Ugwu Odo, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
The main objective of this research was to study the effect of nickel and iron addition on the structure and mechanical properties of tin bronze (Cu-10%wt.Sn). The nickel and iron content was varied at concentration of 0.2, 0.4, 0.6, 0.8 and 1%wt respectively. The alloys samples were produced using permanent die casting technique and machined to the required dimension for the mechanical tests and structural analysis. Mechanical properties such as percentage elongation, ultimate tensile strength, brinell hardness and impact strength were conducted using JPL tensile strength tester (Model: 130812), dynamic hardness tester and impact testing machine respectively. The structural analysis was conducted using an optical metallurgical microscope (model: L2003A) and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). Structural analysis of the control sample revealed the presence of α-phase and dendrite of intermetallic compound. Fine and evenly distributed intermetallic phases were indicated in the alloy doped with nickel and iron respectively. Results of the mechanical properties indicated that addition of nickel and iron significantly improved the percentage elongation, ultimate tensile strength, hardness and impact strength of tin bronze. Maximum percentage elongation and impact strength of 36.5% and 34J respectively were obtained by the sample containing 0.2%wt iron content while optimum ultimate tensile strength and hardness values of 300MPa and 275MPa respectively were obtained by the sample containing 1%wt zinc content.
Bronze, Mechanical Properties, Ductility, Structure, Intermetallic Phases
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