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Microstructure and properties of the Al-7Si-0.5Mg-xLi (x=1, 2, 3) alloys were investigated. The microstructure was observed by optical microscopy, DSC was determined by a differential scanning calorimetry, and the hardness was determined by Vicker's tester. The results show that the primary Si phases are present in the alloys. The amount and size of primary Si phase increase with the increment of...
In the present work, Sn-Ag-Cu-Mg (SACM) and Sn-Ag-Cu-Mg-La (SACML) lead-free solders based on near eutectic Sn-Ag-Cu (SAC) alloys were designed and fabricated. Experiments were conducted to investigate the effect of alloying on the microstructure and physical properties in aspects of melting, wetting performance by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive...
37 filament Bi2223 tapes with different configurations of Ag, AgAu7wt% AgSb0.6wt% and AgMg0.2wt% as the precursor and restack sheaths were fabricated using commercial Bi2223 precursor material and powder-in-tube techniques. Short length samples were heat treated at a temperature in the range of 832degC to 846degC for the first stage (HT 1), followed by a second stage (HT 2) at 825degC for 40 h and...
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