STUDY OF MICROSTRUCTURE, MECHANICAL AND ELECTRICAL PROPERTIES OF ”PB-SN”AND ”PB-SN-ZN”ALLOYS

The transition and melting temperatures for two compositions Pb-10wt.%Sn and Pb-10Sn-1.5wt.%Zn were identified by Differential Thermal Analysis (DTA). The transition temperature and melting temperature were found to be 423 K and 583 K for the first composThe Mechanical and electrical properties of Pb-10wt.%Sn and Pb-10Sn-1.5wt.%Zn alloys were studied. In addition, the relation between these properties and microstructures of these alloys were investigated. In the mechanical properties, this thesis presentsThe transient creep was investigated for Pb-10wt.%Sn and Pb-10Sn-1.5wt.%Zn alloys over a temperature range 373-443 K at stresses ranging from 8.33 to 14.58 MPa. The transient creep data were fitted by the power-law equation: ?tr=?tn, where ? is the creep Also, under the previously mentioned, the steady state creep of two alloys was investigated. The results of creep characteristics showed two deformation regions (below and above 423 K and 403 K for binary and ternary alloys, respectively). The strain rateMoreover, the change of electrical resistivity of Pb-10wt.%Sn and Pb-10Sn-1.5wt.%Zn alloys was measured at different ageing temperatures and times. It was found that, generally, the electrical resistivity (?) for Pb-10Sn-1.5wt.%Zn alloy is less than that