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hamdi--farzad
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Manufacturing And Investigation Of Microstructure, Precipitation Hardening And Tarnishing Of Ag-Cu-Ge Argentium® Alloy
, M.Sc. Thesis Sharif University of Technology ; Abbachi, Parvin (Supervisor) ; Hamdi, Farzad (Supervisor)
Abstract
In this study melting and casting process of Ag-6.3%wt Cu-1.2%wt Ge alloy with NaBH4 additive for grain refining was investigated. ICP and XRF chemical analysis was used for calculating of Boron and Germanium lost in the processing section then an appropriate route for manufacturing of this alloy was suggested. With SEM and EDS chemical analysis which was installed on SEM sample’s microstructures after cold work and heat treatment was investigated. Solidification’s phases were identified with using DTA, XRD and EDS. To introduce a mechanism for increasing of tarnishing resistance in Argentium alloy, XPS analysis were employed. Optical microscope images reveals that casting samples with grain...