Investigative Study of the Structure and Mechanical Properties of Cu-Sn-Zn and Cu-Sn-Mg Alloys
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Kingsley Chidi Nnakwo, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
This research was carried out with the sole objective of investigating the structure and mechanical properties of Cu-Sn-Zn and Cu-Sn-Mg alloys. The effect of zinc and magnesium content on the structural modification and mechanical properties of Cu-Sn alloy was also investigated. Cu-10wt%Sn was used as the base alloy while zinc and magnesium of different concentration (0.2-1%wt) were used as the alloying elements. The alloys samples were developed 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 zinc and magnesium respectively. Mechanical tests results indicated that addition of zinc and magnesium significantly improved the percentage elongation, ultimate tensile strength, hardness and impact strength of the alloy. Cu-Sn-Zn alloy showed increased mechanical properties as the concentration of zinc increased. The hardness values of Cu-Sn-Zn and Cu-Sn-Mg alloys increased as the zinc and magnesium content increased to 0.8%wt and decreased with further increase in the dopants content. Maximum percentage elongation and impact strength of 17.3% and 63J respectively were obtained by the sample containing 1wt% zinc while optimum hardness and ultimate tensile strength values of 285MPa and 312MPa respectively were obtained by the sample containing 0.8%wtand 1wt% magnesium respectively.
Modification, Structure, Hardness, Strength, Intermetallic Phases, Impact
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