Effect of Scandium on Microstructure and Properties of Silver-Based Alloys AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:TG146.32[金属学及工艺—金属材料]

Citation Information:

A series of Ag-xSc silver-based alloys were prepared using a vacuum medium-frequency induction melting furnace,followed by rolling and annealing.The metallographic microstructure of the alloy ingot was observed using an optical microscope(OM).For the annealed alloy,the phase composition was analyzed by a X-ray diffractometer(XRD),the electrical conductivity was measured using a conductivity meter,the hardness was tested by a micro-Vickers hardness tester,and potentiodynamic scanning was performed using an electrochemical workstation.Corrosion experiments were conducted in Na₂S solution and H₂S atmosphere,followed by analysis of the corrosion surface morphology and sulfur content using scanning electron microscope(SEM)coupled with energy-dispersive spectrometer(EDS).The results show that scandium in silver exists primarily in the form of the metallic compound Ag₄Sc,with a small amount of scandium atoms dissolved in the silver matrix.The addition of scandium can refine the silver grains.With the increase of scandium content,the electrical conductivity of the silver-based alloys gradually decreases,the hardness continuously increases,and the corrosion resistance first improves and then declines.The silver-based alloy with 0.75%(mass fraction)Sc exhibits the best corrosion resistance,with a self-corrosion current density of 676μA/cm² and a hardness of 114.4 HV_0.1.