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Title Correlation of the Structure, Mechanical and Physical Properties of Cu-3wt%Si-xwt%Sn Silicon Bronze
Journal International journal of Engineering And Applied Science
Publisher Faculty of Engineering, Nnamdi Azikiwe University, Awka Nigeria.
Issue 1
ISSN 1119-8109
Pages 83-91
Subject Metallurgical and Materials Engineering
Date of Publication November 4, 2018

AUTHOR(S) K. C. Nnakwo and E. E. Nnuka

ABSTRACT

This research investigated the correlation of the structure, mechanical and physical properties of Cu-3wt%Si-xwt%Sn silicon bronze. The effect of tin content on the structure, mechanical and physical properties of Cu-3wt%Si-xwt%Sn silicon bronze was also investigated. Tin was added in concentrations of 0.1, 0.3, 0.5, 0.8, 1 and 1.5wt%. The samples were developed using permanent die casting technique and machined to the required dimensions for the structural analysis, physical and mechanical tests. Mechanical properties such as percentage elongation, ultimate tensile strength and hardness of the developed alloy were investigated using a 100KN JPL tensile strength tester (Model: 130812) and portable dynamic hardness testing machine (Model: DHT-6) respectively. The physical properties such as electrical resistivity and conductivity were also determined using standard Ohm’s experiment. The structural analysis was conducted using an optical metallurgical microscope (Model: L2003A) and scanning electron microscopy (SEM). The microstructural analysis of the control sample (Cu-3wt%Si) revealed the presence of segregated primary silicon and coarse intermetallic phase (Cu3Si). The surface morphology of the doped alloy consisted of refined and modified intermetallic phases evenly dispersed in the alloy structure. The mechanical tests results showed that the percentage elongation, ultimate tensile strength and hardness of the alloy increased significantly by addition of tin. The ultimate tensile strength and hardness of the alloy increased with increase in tin content with corresponding decrease in percentage elongation. It was also observed that the electrical resistivity of the alloy increased with corresponding decrease in electrical conductivity by addition of 0.1wt% of tin. Results obtained also showed that the ultimate tensile strength and hardness correlate with electrical resistivity while the percentage elongation correlates with electrical conductivity. This was concluded to be as a result of grain refinement of the alloy structure by tin addition which caused scattering of electrons, hence increased the electrical resistivity with corresponding decrease in electrical conductivity of the alloy


Keywords: – Electron scattering; mechanical properties;physical properties; silicon bronze; grains.




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