ELECTRODEPOSITION OF AL-CR METALLIC-GLASS

A series of Al100-xCr(x) alloys (x = 11, 14, 25, 41) have been electro deposited from a 2AlCl3-NaCl melt containing approximately 0.1 mol/lit er Cr2+ at 175-degrees-C. The alloy composition and structure were fun ctions of the deposition potential. Depending upon the specific deposi tion parameters, the deposit microstructure consisted of the zeta-Al8C r5 compound, metallic glass, and/or an fcc phase. The Cr2+ concentrati on was monitored by voltammetric analyses of the quasi-reversible Cr2/Cr3+ couple, carried out at high sweep rates due to the limited solub ility of Cr3+. Specular Al100-xCr(x) alloys were also deposited from a room temperature 2AlCl3-TMPAC melt.